Share-based Payment Arrangement [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Dividend, Type [Axis]
Dividend, Type [Axis]
Dividend, Type [Axis]
Dividend, Type [Domain]
Dividend, Type [Domain]
Dividend, Type [Domain]
Ordinary Dividend
Ordinary Cash Dividend [Member]
Ordinary Cash Dividend [Member]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
Stock Options
Share-based Payment Arrangement, Option [Member]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared per share (in dollars per share)
Common Stock, Dividends, Per Share, Declared
Dividend yield (as a percent)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Expected volatility
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Risk-free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Expected life (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Weighted-average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
EIP
Amended and Restated Equity Incentive Plan [Member]
Amended and Restated Equity Incentive Plan [Member]
Annual Incentive Plan
Annual Incentive Plan [Member]
Annual Incentive Plan [Member]
Restricted Stock
Restricted Stock [Member]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Class A Common Stock
Common Class A [Member]
Unrecognized compensation cost related to unvested stock-based compensation agreements
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Unrecognized compensation cost, amortization period
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Total
2021
Unrecognized Compensation Cost, Next 12 Months
Unrecognized Compensation Cost, Next 12 Months
2022
Unrecognized Compensation Cost, Year Two
Unrecognized Compensation Cost, Year Two
2023
Unrecognized Compensation Cost, Year Three
Unrecognized Compensation Cost, Year Three
2024
Unrecognized Compensation Cost, Year Four
Unrecognized Compensation Cost, Year Four
2025
Unrecognized Compensation Cost, Year Five
Unrecognized Compensation Cost, Year Five
Revenue from Contract with Customer [Abstract]
Revenue
Revenue from Contract with Customer [Text Block]
Quarterly Financial Information Disclosure [Abstract]
Unaudited Quarterly Financial Data
Quarterly Financial Information [Text Block]
Income Statement [Abstract]
Revenue
Revenue from Contract with Customer, Excluding Assessed Tax
Operating costs and expenses:
Costs and Expenses [Abstract]
Cost of revenue
Cost of Goods and Services Sold
Billable expenses
Billable Expenses
Billable expenses include direct subcontractor expenses, travel expenses, and other expenses incurred to perform on contracts.
General and administrative expenses
General and Administrative Expense
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction
Total operating costs and expenses
Costs and Expenses
Operating income
Operating Income (Loss)
Interest expense
Interest Expense
Other income (expense), net
Other Nonoperating Income (Expense)
Income before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Income tax expense
Income Tax Expense (Benefit)
Net income
Net Income (Loss) Attributable to Parent
Earnings per common share (Note 3):
Earnings Per Share [Abstract]
Basic (in dollars per share)
Earnings Per Share, Basic
Diluted (in dollars per share)
Earnings Per Share, Diluted
Income Tax Disclosure [Abstract]
Income Taxes
Income Tax Disclosure [Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments
Schedule of Derivative Instruments [Table Text Block]
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Secured Debt
Secured Debt [Member]
Senior Notes
Senior Notes [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Term Loan A
Tranche-A Loans [Member]
Tranche A Loans [Member]
Term Loan B
Tranche B Loans [Member]
Tranche B Loans [Member]
Revolver
Revolver [Member]
Revolver [Member]
Senior Notes
Senior Notes Due 2025 [Member]
Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Long-term Debt, Current and Noncurrent [Abstract]
Long-term Debt, Current and Noncurrent [Abstract]
Interest rate on long term debt
Debt Instrument, Interest Rate, Effective Percentage
Total
Long-term Debt, Gross
Less: Unamortized debt issuance costs and discount on debt
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Long-term debt
Long-term Debt
Less: Current portion of long-term debt
Long-term Debt, Current Maturities
Long-term debt, net of current portion
Long-term Debt, Excluding Current Maturities
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Retirement Plan Name [Axis]
Retirement Plan Name [Axis]
Retirement Plan Name [Domain]
Retirement Plan Name [Domain]
Officer Medical Plan
Officer Medical Plan [Member]
Officer Medical Plan [Member]
Retired Officers' Bonus Plan
Retired Officers' Bonus Plan [Member]
Retired Officers' Bonus Plan [Member]
Retired Vice Presidents' Bonus Plan
Retired Vice Presidents' Bonus Plan [Member]
Retired Vice Presidents' Bonus Plan [Member]
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Other Postretirement Benefits Plan
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate for benefit obligation
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Payables and Accruals [Abstract]
Vendor payables
Accounts Payable, Trade, Current
Accrued expenses
Accrued Liabilities, Current
Total accounts payable and other accrued expenses
Accounts Payable and Accrued Liabilities, Current
Loss Contingencies [Table]
Loss Contingencies [Table]
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Unfavorable Regulatory Action
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Provision for claimed indirect costs
Loss Contingency Accrual
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of the year
Defined Benefit Plan, Benefit Obligation
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Net actuarial (gain) loss
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Benefits paid
Defined Benefit Plan, Benefit Obligation, Benefits Paid
Benefit obligation, end of the year
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of the year
Defined Benefit Plan, Plan Assets, Amount
Employer contributions
Defined Benefit Plan, Plan Assets, Contributions by Employer
Benefits paid
Defined Benefit Plan, Plan Assets, Benefits Paid
Fair value of plan assets, end of the year
Defined benefit plan, funded (unfunded) status of plan
Defined Benefit Plan, Funded (Unfunded) Status of Plan
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
Allowance for doubtful accounts
SEC Schedule, 12-09, Valuation Allowance, Accounts Receivable [Member]
SEC Schedule, 12-09, Valuation Allowance, Accounts Receivable [Member]
Tax valuation allowance
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount
Provision for doubtful accounts
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense
Charges against allowance
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction
Ending balance
Equity [Abstract]
Dividend equivalents
Dividend equivalent [Member]
Dividend equivalent [Member]
Recurring dividends
Dividends, Common Stock
Dividends
Dividends
Summary of Components of Income Tax Expense
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Components of Deferred Tax Assets and Liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Unrecognized Tax Benefits
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Compensation Related Costs [Abstract]
Bonus
Accrued Bonuses, Current
Retirement
Liability, Pension and Other Postretirement and Postemployment Benefits, Current
Vacation
Accrued Vacation, Current
Other
Other Employee-related Liabilities, Current
Total accrued compensation and benefits
Employee-related Liabilities, Current
Shares authorized to be repurchased (in shares)
Stock Repurchase Program, Number of Shares Authorized to be Repurchased
Discount for shares repurchased (as a percent)
Stock Repurchase Program, Shares Repurchased, Discount Percentage
Stock Repurchase Program, Shares Repurchased, Discount Percentage
Stock issued during period, Shares, employee stock purchase plans
Stock Issued During Period, Shares, Employee Stock Purchase Plans
Fair Value Disclosures [Abstract]
Summary of Fair Value Measurements
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
Schedule of Accrued Compensation and Benefits
Schedule of Accrued Compensation And Benefits [Table Text Block]
Schedule of Accrued Compensation And Benefits [Table Text Block]
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Post-retirement plans
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Derivatives designated as cash flow hedges
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Derivatives designated as cash flow hedges
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Totals
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of year
Stockholders' Equity Attributable to Parent
Other comprehensive income (loss) before reclassifications
OCI, before Reclassifications, Net of Tax, Attributable to Parent
Amounts reclassified from accumulated other comprehensive loss
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent
Total other comprehensive (loss) income, net of tax
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Reclassification of AOCI due to the 2017 Tax Act (4)
Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings
Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings
End of year
Tax expense (benefit)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent
Special Cash Dividend
Special Cash Dividend [Member]
Special Cash Dividend [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Unvested, ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, beginning balance, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Vested, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Forfeited, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Unvested, ending balance, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Expired (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period
Exercised (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Outstanding, ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning balance, weighted average exercise price (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted, weighted average exercise price (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Forfeited, weighted average exercise price (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Expired, weighted average exercise price (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price
Exercised, weighted average exercise price (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Outstanding, ending balance, weighted average exercise price (in dollars per share)
Dividend, option exercise price reduction, per share (in dollars per share)
Dividend, Option Exercise Price Reduction, Per Share
Dividend, Option Exercise Price Reduction, Per Share
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Unvested, beginning balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number
Vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares
Forfeited (in shares)
Unvested, ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, beginning balance, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price
Granted, weighted average grant date fair value (in dollars per share)
Vested, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value
Forfeited, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value
Unvested, ending balance, weighted average grant date fair value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Exercise price, lower range limit (in dollars per share)
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit
Exercise price, upper range limit (in dollars per share)
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit
Stock options outstanding (in shares)
Outstanding, weighted average exercise price (in dollars per share)
Outstanding, weighted average remaining contractual life (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Outstanding, intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Stock options exercisable (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Stock options exercisable, weighted average exercise price (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Stock options exercisable, weighted average remaining contractual life (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Stock options exercisable, intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Employee Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Cover [Abstract]
Document Type
Document Type
Document Annual Report
Document Annual Report
Document Period End Date
Document Period End Date
Document Transition Report
Document Transition Report
Entity File Number
Entity File Number
Entity Registrant Name
Entity Registrant Name
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Entity Tax Identification Number
Entity Tax Identification Number
Entity Address, Address Line One
Entity Address, Address Line One
Entity Address, City or Town
Entity Address, City or Town
Entity Address, State or Province
Entity Address, State or Province
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
City Area Code
City Area Code
Local Phone Number
Local Phone Number
Title of 12(b) Security
Title of 12(b) Security
Trading Symbol
Trading Symbol
Security Exchange Name
Security Exchange Name
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Interactive Data Current
Entity Interactive Data Current
Entity Filer Category
Entity Filer Category
Entity Small Business
Entity Small Business
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Shell Company
Entity Shell Company
Entity Public Float
Entity Public Float
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Documents Incorporated by Reference
Documents Incorporated by Reference [Text Block]
Entity Central Index Key
Entity Central Index Key
Amendment Flag
Amendment Flag
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Current Fiscal Year End Date
Current Fiscal Year End Date
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Cost of revenue
Cost of Sales [Member]
General and administrative expenses
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense
Share-based Payment Arrangement, Expense
Revenue, amount of remaining performance obligation
Revenue, Remaining Performance Obligation, Amount
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing, period one
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period One
Remaining performance obligation, expected timing, period two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Two
Remaining performance obligation, percentage
Revenue, Remaining Performance Obligation, Percentage
Contract with customer, liability, revenue recognized
Contract with Customer, Liability, Revenue Recognized
Accrued Compensation and Benefits
Compensation Related Costs, General [Text Block]
Deferred income tax assets:
Deferred Tax Assets, Net [Abstract]
Accrued expenses
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities
Deferred compensation
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation
Stock-based compensation
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost
Pension and postretirement benefits
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits
Net operating loss carryforwards
Deferred Tax Assets, Net Operating Loss & Capital Loss Carryforwards
Deferred Tax Assets, Net Operating Loss & Capital Loss Carryforwards
Deferred rent and tenant allowance
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent
Extended disability benefits
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits
Interest rate swaps
Deferred Tax Assets, Derivative Instruments
State tax credits
Deferred Tax Assets, Tax Credit Carryforwards
Operating lease liabilities
Deferred Tax Assets, Operating Lease, Liability
Deferred Tax Assets, Operating Lease, Liability
Other
Deferred Tax Assets, Other
Total gross deferred income tax assets
Deferred Tax Assets, Gross
Less: Valuation allowance
Deferred Tax Assets, Valuation Allowance
Total net deferred income tax assets
Deferred Tax Assets, Net of Valuation Allowance
Deferred income tax liabilities:
Deferred Tax Liabilities, Net [Abstract]
Unbilled receivables
Deferred Tax Liabilities, Current Accounts Receivable, Unbilled
Amount of deferred tax liability attributable to taxable temporary differences from unbilled current accounts receivable.
Intangible assets
Deferred Tax Liabilities, Intangible Assets
Debt issuance costs
Deferred Tax Liabilities, Deferred Expense, Debt Issuance Costs
Property and equipment
Deferred Tax Liabilities, Property, Plant and Equipment
Operating lease right-of-use assets
Deferred Tax Liabilities, Operating Lease, Right-of-Use Asset
Deferred Tax Liabilities, Operating Lease, Right-of-Use Asset
Internally developed software
Deferred Tax Liabilities, Internally Developed Software
Deferred Tax Liabilities, Internally Developed Software
Total deferred income tax liabilities
Deferred Tax Liabilities, Gross
Net deferred income tax liabilities
Deferred Tax Liabilities, Net
Accounting Policies [Abstract]
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Customer relationships
Customer Relationships [Member]
Software
Software and Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)
Finite-Lived Intangible Asset, Useful Life
Impairment charge on intangibles
Impairment of Intangible Assets, Finite-lived
Goodwill impairment
Goodwill, Impairment Loss
Impairment charges
Impairment of Long-Lived Assets Held-for-use
Operating Loss Carryforwards [Table]
Operating Loss Carryforwards [Table]
Tax Period [Axis]
Tax Period [Axis]
Tax Period [Domain]
Tax Period [Domain]
Tax Years 2013-2015
Tax Years 2013-2015 [Member]
Tax Years 2013-2015 [Member]
Tax Years 2016-2019
Tax Years 2016-2019 [Member]
Tax Years 2016-2019 [Member]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
Domestic
Domestic Tax Authority [Member]
State
State and Local Jurisdiction [Member]
Foreign
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards [Line Items]
Blended rate (as a percent)
Effective Income Tax Rate Reconciliation, Blended Rate, Percent
Effective Income Tax Rate Reconciliation, Blended Rate, Percent
Net operating losses
Operating Loss Carryforwards
Income tax reserves
Liability for Uncertainty in Income Taxes, Noncurrent
Unrecognized tax benefits that would impact effective tax rate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Accrued interest and penalties
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense
Income tax reserve, accrued penalties and interest
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Reasonably possible change in unrecognized tax benefits from lapse of statute of limitations
Unrecognized Tax Benefits, Reasonably Possible, Reduction Resulting from Lapse of Applicable Statute of Limitations
Unrecognized Tax Benefits, Reasonably Possible, Reduction Resulting from Lapse of Applicable Statute of Limitations
Income tax assessments
Income Tax Examination, Estimate of Possible Loss
Reconciliation of the beginning and ending amount of potential tax benefits
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of year
Unrecognized Tax Benefits
Increases in prior year position
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions
Increases in current year position
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions
Decreases in prior year position
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions
Settlements with taxing authorities
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities
Lapse of statute of limitations
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations
End of year
Summary of Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies [Text Block]
Other Liabilities Disclosure [Abstract]
Other Commitments [Table]
Other Commitments [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Noncurrent Liabilities
Other Noncurrent Liabilities [Member]
Other Commitments [Line Items]
Other Commitments [Line Items]
Deferred rent
Deferred Rent Credit, Noncurrent
Postretirement benefit obligations
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent
Other
Other Liabilities and Deferred Revenue, Noncurrent
Total other long-term liabilities
Other Liabilities, Noncurrent
Long-term disability obligation
Postemployment Benefits Liability, Noncurrent
Estimated fair value of derivative liabilities
Derivative Instruments in Hedges, Liabilities, at Fair Value
Schedule of Components of Net Postretirement Medical Expense
Schedule of Net Benefit Costs [Table Text Block]
Schedule of Weighted-average Discount Rate For Benefit Obligation
Defined Benefit Plan, Assumptions [Table Text Block]
Schedule of Assumed Health Care Cost Trend Rates
Schedule of Health Care Cost Trend Rates [Table Text Block]
Schedule of Change in Benefit Obligation
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Schedule of Change in Fair Value of Plan Assets
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Schedule of Expected Future Benefit Payments
Schedule of Expected Benefit Payments [Table Text Block]
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities
Operating Lease, Weighted Average Remaining Lease Term
Operating lease liabilities arising from obtaining ROU assets
Operating Lease, Payments
Weighted average remaining lease term (in years)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Weighted average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
Goodwill and Intangible Assets Disclosure [Abstract]
Customer relationships and other amortizable intangible assets
Order or Production Backlog [Member]
Software
Computer Software, Intangible Asset [Member]
Indefinite-lived Intangible Assets by Major Class [Axis]
Indefinite-lived Intangible Assets [Axis]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Trade name
Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value
Finite-Lived Intangible Assets, Gross
Accumulated Amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Total estimated amortization expense
Finite-Lived Intangible Assets, Net
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Unamortizable intangible assets
Indefinite-lived Intangible Assets (Excluding Goodwill)
Intangible assets, gross
Intangible Assets, Gross (Excluding Goodwill)
Net Carrying Value
Intangible Assets, Net (Excluding Goodwill)
Current
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. Federal
Current Federal Tax Expense (Benefit)
State and local
Current State and Local Tax Expense (Benefit)
Foreign
Current Foreign Tax Expense (Benefit)
Total current
Current Income Tax Expense (Benefit)
Deferred
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. Federal
Deferred Federal Income Tax Expense (Benefit)
State and local
Deferred State and Local Income Tax Expense (Benefit)
Total deferred
Deferred Income Tax Expense (Benefit)
Total
Employer matching contribution, percentage of match
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
Employees’ capital accumulation plan, total expense recognized
Defined Contribution Plan, Cost
Employees’ capital accumulation plan, company-paid contributions
Defined Contribution Plan, Employer Discretionary Contribution Amount
Retired Officers' Bonus Plan and Retired Vice-President Bonus Plan
Retired Officers' Bonus Plan and Retired Vice-President Bonus Plan [Member]
Retired Officers' Bonus Plan and Retired Vice-President Bonus Plan [Member]
Retired Officers' Bonus Plan
Supplemental Employee Retirement Plan [Member]
Deferred compensation arrangement with individual, annual cash award granted per year of service, amount
Deferred Compensation Arrangement with Individual, Annual Cash Award Granted per Year of Service, Amount
Deferred Compensation Arrangement with Individual, Annual Cash Award Granted per Year of Service, Amount
Reduction to plan liability
Increase (Decrease) In Postemployment Benefits Liability, Noncurrent
Increase (Decrease) In Postemployment Benefits Liability, Noncurrent
Deferred compensation plans, maximum eligible deferral of compensation percentage
Deferred Compensation Plans, Maximum Eligible Deferral of Compensation, Percentage
Deferred Compensation Plans, Maximum Eligible Deferral of Compensation, Percentage
Defined benefit plan, funded (unfunded) status of plan
Long-term deferred compensation costs
Deferred Compensation Plan Assets
Deferred payment obligation, original amount
Deferred Payment Obligation, Original Amount
Deferred Payment Obligation, Original Amount
Deferred payment obligation, term
Deferred Payment Obligation Term
Deferred Payment Obligation Term
Deferred payment obligation, payment pursuant of the merger agreement
Deferred Payment Obligation, Payment, Pursuant of the Merger Agreement
Deferred Payment Obligation, Payment, Pursuant of the Merger Agreement
Deferred payment obligation, payment
Deferred Payment Obligation, Payment
Deferred Payment Obligation, Payment
Deferred payment obligation, accrued interest payment
Deferred Payment Obligation, Interest Payment
Deferred Payment Obligation, Interest Payment
Deferred payment obligation
Deferred Payment Obligation
Deferred Payment Obligation
Required payment on DPO
Deferred Payment Obligation, Required Payment
Deferred Payment Obligation, Required Payment
Schedule of Quarterly Financial Information
Quarterly Financial Information [Table Text Block]
Stock-Based Compensation
Share-based Payment Arrangement [Text Block]
Summary of Dividends Declared
Dividends Declared [Table Text Block]
Operating lease cost
Operating Lease, Cost
Short-term lease cost
Short-term Lease, Cost
Variable lease cost
Variable Lease, Cost
Total operating lease costs
Lease, Cost
Reclassification out of Accumulated Other Comprehensive Income [Table]
Reclassification out of Accumulated Other Comprehensive Income [Table]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of net actuarial loss
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net actuarial loss included in net periodic benefit cost
Tax benefit (expense)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments
Number of Operating Segments
Number of employees
Entity Number of Employees
Statement of Comprehensive Income [Abstract]
Net income
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized gain (loss) on derivatives designated as cash flow hedges
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Change in unrealized gain (loss) on derivatives designated as cash flow hedges
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Change in postretirement plan costs
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Segment Reporting [Abstract]
Number of reportable segments
Number of Reportable Segments
Common stock votes per share
Common Stock Votes Per Share
Common stock votes per share
Share repurchase program, remaining authorized repurchase amount
Stock Repurchase Program, Remaining Authorized Repurchase Amount
Repurchase of common stock (in shares)
Treasury Stock, Shares, Acquired
Share repurchase program, amount authorized
Stock Repurchase Program, Authorized Amount
Related Party Transactions [Abstract]
Related-Party Transactions
Related Party Transactions Disclosure [Text Block]
Statement of Cash Flows [Abstract]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization
Depreciation, Depletion and Amortization
Noncash lease expense
Noncash Lease Expense
Noncash Lease Expense
Stock-based compensation expense
Share-based Payment Arrangement, Noncash Expense
Deferred income taxes
Amortization of debt issuance costs and loss on extinguishment
Amortization Of Financing Costs And Discounts and Gain/Loss on Extinguishment of Debt
Amortization Of Financing Costs And Discounts and Loss on Extinguishment of Debt
Losses (gains) on dispositions
Gain (Loss) on Disposition of Assets
Changes in assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable, net of allowance
Increase (Decrease) in Accounts Receivable
Income taxes receivable / payable
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Other long-term assets
Increase (Decrease) in Other Noncurrent Assets
Accrued compensation and benefits
Increase (Decrease) in Employee Related Liabilities
Accounts payable and other accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Income tax reserves
Increase (Decrease) in Reserve for Commissions, Expense and Taxes
Other current liabilities
Increase (Decrease) in Other Current Liabilities
Operating lease liabilities
Increase (Decrease) In Operating Lease Liabilities
Increase (Decrease) In Operating Lease Liabilities
Other long-term liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Cash flows from investing activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of property, equipment, and software
Payments to Acquire Productive Assets
Payments for businesses acquired, net of proceeds from sales of business
Payments for (Proceeds from) Businesses and Interest in Affiliates
Insurance proceeds received for damage to equipment
Proceeds from Insurance Settlement, Investing Activities
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Cash flows from financing activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from issuance of common stock
Proceeds from Issuance of Common Stock
Stock option exercises
Proceeds from Stock Options Exercised
Repurchases of common stock
Payments for Repurchase of Common Stock
Cash dividends paid
Payments of Dividends
Repayment of debt
Repayments of Debt
Proceeds from debt issuance
Proceeds from Issuance of Long-term Debt
Payment of deferred payment obligation
Other financing activities
Proceeds from (Payments for) Other Financing Activities
Net cash provided by (used in) financing activities
Net Cash Provided by (Used in) Financing Activities
Net increase (decrease) in cash and cash equivalents
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Cash and cash equivalents––beginning of year
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and cash equivalents––end of year
Supplemental disclosures of cash flow information
Supplemental Cash Flow Information [Abstract]
Interest
Interest Paid, Excluding Capitalized Interest, Operating Activities
Income taxes
Income Taxes Paid, Net
Supplemental disclosures of non-cash investing and financing activities
Noncash Investing and Financing Items [Abstract]
Share repurchases transacted but not settled and paid
Share Repurchases Incurred But Not Yet Paid
Share Repurchases Incurred But Not Yet Paid
Noncash financing activities
Noncash Financing Activities
Noncash Financing Activities
Fair Value Measurements
Fair Value Disclosures [Text Block]
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Statement of Financial Position [Abstract]
ASSETS
Assets [Abstract]
Current assets:
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Accounts receivable, net of allowance
Accounts Receivable, after Allowance for Credit Loss, Current
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Total current assets
Assets, Current
Property and equipment, net of accumulated depreciation
Property, Plant and Equipment, Net
Operating lease right-of-use assets
Operating Lease, Right-of-Use Asset
Intangible assets, net of accumulated amortization
Goodwill
Goodwill
Other long-term assets
Other Assets, Noncurrent
Total assets
Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Current portion of long-term debt
Accounts payable and other accrued expenses
Accrued compensation and benefits
Operating lease liabilities
Operating Lease, Liability, Current
Other current liabilities
Other Liabilities, Current
Total current liabilities
Liabilities, Current
Operating lease liabilities, net of current portion
Operating Lease, Liability, Noncurrent
Deferred tax liabilities
Deferred Income Tax Liabilities, Net
Other long-term liabilities
Total liabilities
Liabilities
Commitments and contingencies (Note 22)
Commitments and Contingencies
Stockholders’ equity:
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, Class A — $0.01 par value — authorized, 600,000,000 shares; issued, 161,333,973 shares at March 31, 2020 and 159,924,825 shares at March 31, 2019; outstanding, 138,719,921 shares at March 31, 2020 and 140,027,853 shares at March 31, 2019
Common Stock, Value, Issued
Treasury stock, at cost — 22,614,052 at March 31, 2020 and 19,896,972 shares at March 31, 2019
Treasury Stock, Value
Additional paid-in capital
Additional Paid in Capital, Common Stock
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total stockholders’ equity
Total liabilities and stockholders’ equity
Liabilities and Equity
Earnings Per Share
Earnings Per Share [Text Block]
Summary of Intangible Assets
Schedule of Intangible Assets and Goodwill [Table Text Block]
Summary of Expected Amortization Expense for Intangible Assets
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding
Treasury stock, shares (in shares)
Treasury Stock, Shares
Leases
Lessee, Operating Leases [Text Block]
Revolving Credit Facility
Revolving Credit Facility [Member]
Interest expense, debt
Interest Expense, Debt
Amortization of debt issuance costs
Amortization of Debt Issuance Costs and Discounts
Interest Swap Expense
Interest Expense, Debt, Interest Swap
Interest Expense, Debt, Interest Swap
Other
Interest Income (Expense), Other
Interest Income (Expense), Other
Total Interest Expense
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Reclassification
Reclassification, Policy [Policy Text Block]
Accounting Estimates
Use of Estimates, Policy [Policy Text Block]
Revenue Recognition
Revenue from Contract with Customer [Policy Text Block]
Cash and Cash Equivalents
Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]
Valuation of Accounts Receivable
Accounts Receivable [Policy Text Block]
Concentrations of Credit Risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Property and Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
Business Combinations
Business Combinations Policy [Policy Text Block]
Intangible Assets
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]
Goodwill
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Long-Lived Assets
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Leases
Lessee, Leases [Policy Text Block]
Income Taxes
Income Tax, Policy [Policy Text Block]
Comprehensive Income
Comprehensive Income, Policy [Policy Text Block]
Share-Based Payments
Share-based Payment Arrangement [Policy Text Block]
Defined Benefit Plan and Other Postretirement Benefits
Pension and Other Postretirement Plans, Policy [Policy Text Block]
Self-Funded Medical Plans
Self Insurance Reserve [Policy Text Block]
Fair Value Measurements
Fair Value Measurement, Policy [Policy Text Block]
Recently Adopted Accounting Standards and Recent Accounting Pronouncements Not Yet Adopted
New Accounting Pronouncements, Policy [Policy Text Block]
Unrecognized gross actuarial gain
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax
Unrecognized actuarial gain, tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax
Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.
Net actuarial loss
Defined Benefit Plan, Amortization of Gain (Loss)
Total postretirement medical expense
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Schedule of Other Long-Term Liabilities
Schedule of Other Assets and Other Liabilities [Table Text Block]
Accumulated Other Comprehensive Loss
Comprehensive Income (Loss) Note [Text Block]
Schedule of Debt
Schedule of Debt [Table Text Block]
Schedule of Future Debt Principal Repayments
Schedule of Maturities of Long-term Debt [Table Text Block]
Schedule of Interest Expense
Interest Income and Interest Expense Disclosure [Table Text Block]
Goodwill and Intangible Assets
Goodwill and Intangible Assets Disclosure [Text Block]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
Subsequent Events [Abstract]
Subsequent Events
Subsequent Events [Text Block]
Business Segment Information
Segment Reporting Disclosure [Text Block]
Statement of Stockholders' Equity [Abstract]
Dividends paid (in dollars per share)
Common Stock, Dividends, Per Share, Cash Paid
Subsequent Event [Table]
Subsequent Event [Table]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Stock repurchased, restricted stock awards, value withheld for taxes
Payment, Tax Withholding, Share-based Payment Arrangement
Stock repurchased, restricted stock withheld for taxes (in shares)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation
Concentration Risk [Table]
Concentration Risk [Table]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Financial Standby Letter of Credit
Financial Standby Letter of Credit [Member]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Contracts with U.S. government agencies or other U.S. government contractors
Government Contracts Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk [Line Items]
Guarantor obligations, carrying value
Guarantor Obligations, Current Carrying Value
Guarantor obligations, reduction to available borrowings
Guarantor Obligations, Liquidation Proceeds, Monetary Amount
Guarantor obligations, facility
Guarantor Obligations, Facility
Guarantor Obligations, Facility
Guarantor obligations, available amount
Guarantor Obligations, Available Amount
Guarantor Obligations, Available Amount
Concentration risk, percentage
Concentration Risk, Percentage
Liability for reductions and/or penalties from U.S Government audits
Other Long-Term Liabilities
Other Liabilities Disclosure [Text Block]
Schedule of Accumulated Other Comprehensive Loss
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Summary of Reclassifications Out of Accumulated Other Comprehensive Loss to Net Income
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Furniture and equipment
Furniture and Fixtures [Member]
Computer equipment
Computer Equipment [Member]
Leasehold improvements
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Property and equipment, gross
Property, Plant and Equipment, Gross
Less: Accumulated depreciation and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Property and equipment, net
Depreciation and amortization expense related to property and equipment
Depreciation
Reduction to gross cost and accumulated depreciation for zero net book value assets
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment
Title of Individual [Axis]
Title of Individual [Axis]
Title of Individual [Domain]
Title of Individual [Domain]
Officer
Officer [Member]
Total pension expense
Benefits paid
Benefit obligation
Fair value of plan assets
Rent expense
Operating Leases, Rent Expense
Sublease income
Sublease Income
Operating Lease Payments
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2020
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2021
Operating Leases, Future Minimum Payments, Due in Two Years
2022
Operating Leases, Future Minimum Payments, Due in Three Years
2023
Operating Leases, Future Minimum Payments, Due in Four Years
2024
Operating Leases, Future Minimum Payments, Due in Five Years
Thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Operating leases, future minimum payments due
Operating Leases, Future Minimum Payments Due
Operating Sublease Income
Operating Leases, Future Minimum Payments Due, Sublease Rentals, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Sublease Rentals, Fiscal Year Maturity [Abstract]
2020
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, In Twelve Months
Contractually required future rental payments receivable within twelve months from the balance sheet date on noncancelable subleasing arrangements.
2021
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, in Two Years
Contractually required future rental payments receivable within the second year from the balance sheet date on noncancelable subleasing arrangements.
2022
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, in Three Years
Contractually required future rental payments receivable within the third year from the balance sheet date on noncancelable subleasing arrangements.
2023
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, in Four Years
Contractually required future rental payments receivable within the fourth year from the balance sheet date on noncancelable subleasing arrangements.
2024
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, in Five Years
Contractually required future rental payments receivable within the fifth year from the balance sheet date on noncancelable subleasing arrangements.
Thereafter
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due Thereafter
Contractually required future rental payments receivable after the fifth year from the balance sheet date on noncancelable subleasing arrangements.
Operating leases, future minimum payments due, future minimum sublease rentals
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals
Supplemental Financial Information
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
For the Fiscal Year Ending March 31,
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months
2022
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
2023
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
2024
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
2025
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
2026 - 2030
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter
Business Overview
Nature of Operations [Text Block]
Accounts Payable and Other Accrued Expenses
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Derivative [Table]
Derivative [Table]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Cash Flow Hedging
Cash Flow Hedging [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Designated as Hedging Instrument
Designated as Hedging Instrument [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Forward Starting Floating-To-Fixed Interest Rate Swap
Forward Starting Floating-To-Fixed Interest Rate Swap [Member]
Forward Starting Floating-To-Fixed Interest Rate Swap [Member]
Interest Rate Swap
Interest Rate Swap [Member]
Other Current Assets
Other Current Assets [Member]
Other Noncurrent Assets
Other Noncurrent Assets [Member]
Other Current Liabilities
Other Current Liabilities [Member]
Derivative [Line Items]
Derivative [Line Items]
Number of agreements entered into during period
Derivatives, Number Of Agreements Entered Into During The Period
Derivatives, Number Of Agreements Entered Into During The Period
Number of financial institutions
Derivatives, Number Of Financial Institutions
Derivatives, Number Of Financial Institutions
Notional amount of interest rate swap
Derivative, Notional Amount
Estimated fair value of derivative assets
Derivative Instruments in Hedges, Assets, at Fair Value
Estimated amounts to be reclassified over 12 months
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Receivables [Abstract]
Current assets:
Accounts receivable–billed
Billed Contracts Receivable
Accounts receivable–unbilled
Contract with Customer, Asset, Net, Current
Allowance for doubtful accounts
Accounts Receivable, Allowance for Credit Loss, Current
Accounts receivable, net of allowance
Other long-term assets:
Other Assets, Noncurrent [Abstract]
Accounts receivable–unbilled
Contract with Customer, Asset, Net, Noncurrent
Total accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss
Provision for doubtful accounts
Accounts Receivable, Credit Loss Expense (Reversal)
Summary of Stock-based Compensation Expense Recognized in the Consolidated Statements of Operations
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Schedule of Unrecognized Compensation Cost
Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block]
Schedule of Black Scholes Weighted Average Assumptions
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Unvested Restricted Stock Activity
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Share-based Payment Arrangement, Option, Activity
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Deferred Payment Obligation
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Noncurrent [Text Block]
New Accounting Pronouncements or Change in Accounting Principle [Table]
New Accounting Pronouncements or Change in Accounting Principle [Table]
Adjustments for New Accounting Pronouncements [Axis]
Adjustments for New Accounting Pronouncements [Axis]
Type of Adoption [Domain]
Type of Adoption [Domain]
Accounting Standards Update 2018-02
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets, Noncurrent [Abstract]
Assets, Noncurrent [Abstract]
Liabilities, Current [Abstract]
Accounts payable and other accrued expenses
Liabilities, Noncurrent [Abstract]
Liabilities, Noncurrent [Abstract]
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Contract with Customer, Basis of Pricing [Axis]
Contract with Customer, Basis of Pricing [Axis]
Contract with Customer, Basis of Pricing [Domain]
Contract with Customer, Basis of Pricing [Domain]
Cost-reimbursable
Cost Reimbursable Contract [Member]
Cost Reimbursable Contract
Time-and-materials
Time-and-materials Contract [Member]
Fixed-price
Fixed-price Contract [Member]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
UNITED STATES
UNITED STATES
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
Defense Clients
Defense Clients [Member]
Defense Clients [Member]
Intelligence Clients
Intelligence Clients [Member]
Intelligence Clients [Member]
Civil Clients
Civil Clients [Member]
Civil Clients [Member]
Global Commercial Clients
Global Commercial Clients [Member]
Global Commercial Clients [Member]
Contract with Customer, Sales Channel [Axis]
Contract with Customer, Sales Channel [Axis]
Contract with Customer, Sales Channel [Domain]
Contract with Customer, Sales Channel [Domain]
Prime Contractor
Sales Channel, Directly to Consumer [Member]
Sub-contractor
Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Revenue (as a percent)
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivatives
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
Amount of Gain or (Loss) Reclassified from AOCI into Income
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net
Interest Expense on Consolidated Statements of Operations
Right-of-use asset
Operating lease liabilities
Operating Lease, Liability
Deferred tax liability corresponding to operating lease right-of-use assets
Operating Lease, Right-of-Use Asset, Deferred Tax Liability
Operating Lease, Right-of-Use Asset, Deferred Tax Liability
Deferred tax asset corresponding to operating lease liabilities
Operating Lease, Liability, Deferred Tax Asset
Operating Lease, Liability, Deferred Tax Asset
Operating lease, deferred rent and tenant allowances
Operating Lease, Liability, Deferred Rent and Tenant Allowances
Operating Lease, Liability, Deferred Rent and Tenant Allowances
Summary of Components of Property and Equipment, Net
Property, Plant and Equipment [Table Text Block]
Contract assets:
Contract with Customer, Asset, after Allowance for Credit Loss [Abstract]
Current
Long-term
Total
Contract with Customer, Asset, after Allowance for Credit Loss
Contract liabilities:
Contract with Customer, Liability [Abstract]
Advance payments, billings in excess of costs incurred and deferred revenue
Contract with Customer, Liability
Former stockholder litigation
Former Stockholder Litigation [Member]
Former Stockholder Litigation [Member]
Litigation Court [Axis]
Litigation Court [Axis]
Litigation Court [Axis]
Litigation Court Type [Domain]
Litigation Court Type [Domain]
Litigation Court Type [Domain]
United States Court of Appeals for the Ninth Circuit
United States Court of Appeals for the Ninth Circuit [Member]
United States Court of Appeals for the Ninth Circuit [Member]
United States District Court for the Southern District of New York
United States Court of Appeals for the Second Circuit [Member]
United States Court of Appeals for the Second Circuit [Member]
Litigation Case [Axis]
Litigation Case [Axis]
Litigation Case [Domain]
Litigation Case [Domain]
United States District Court For The Eastern District Of Virginia Styled Langley V. Booz Allen Hamilton Holding Corp.
United States District Court For The Eastern District Of Virginia Styled Langley V. Booz Allen Hamilton Holding Corp. [Member]
United States District Court for the Eastern District of Virginia styled Langley v. Booz Allen Hamilton Holding Corp. [Member]
Loss contingencies, number of plaintiffs
Loss Contingency, Number of Plaintiffs
Loss contingencies, new claims filed, number
Loss Contingency, New Claims Filed, Number
Loss contingencies, claims amended, number
Loss Contingency, Claims Amended, Number
Loss Contingency, Claims Amended, Number
Loss contingencies, pending claims, number
Loss Contingency, Pending Claims, Number
Loss contingencies, claims dismissed, number
Loss Contingency, Claims Settled and Dismissed, Number
Loss contingencies, claims settled, number
Loss Contingency, Claims Settled, Number
Goodwill
Amortization of intangible assets
Amortization of Intangible Assets
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Domain]
Debt Instrument, Redemption, Period [Domain]
May 1, 2020
Debt Instrument, Redemption, Period One [Member]
May 1, 2021
Debt Instrument, Redemption, Period Two [Member]
May 1, 2022
Debt Instrument, Redemption, Period Three [Member]
Letter of Credit
Letter of Credit [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
London Interbank Offered Rate (LIBOR)
London Interbank Offered Rate (LIBOR) [Member]
Base Rate
Base Rate [Member]
Overnight Federal Funds Rate
Overnight Federal Funds Rate [Member]
Overnight Federal Funds Rate
Alternative Base Rate (ABR)
Alternative Base Rate (ABR) [Member]
Alternative Base Rate (ABR) [Member]
Long-term debt, basis spread on variable rate
Debt Instrument, Basis Spread on Variable Rate
Premium payable (as a percent)
Debt Instrument, Debt Covenant, Premium Payable, Percent
Debt Instrument, Debt Covenant, Premium Payable, Percent
Revolving credit facility, maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Maximum expanded loan facility
Long-term Debt, Maximum Expanded Loan Facility
Long-Term Debt, Maximum Expanded Loan Facility
Percentage of consolidated EBITDA required
Debt Covenant, Expanded Loan, Percentage of Consolidated EBITDA Required
Debt Covenant, Expanded Loan, Percentage of Consolidated EBITDA Required
Maximum net secured leverage ratio
Debt Instrument, Net Secured Leverage Ratio, Maximum
Debt Instrument, Net Secured Leverage Ratio, Maximum
Commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
Proceeds from line of credit
Proceeds from Lines of Credit
Revolving credit facility, amount outstanding
Long-term Line of Credit
Quarterly periodic payment percentage, principal
Debt Instrument, Quarterly Periodic Payment Percentage, Principal
Debt Instrument, Quarterly Periodic Payment Percentage, Principal
Interest paid
Interest Paid, Including Capitalized Interest, Operating and Investing Activities
Stated interest rate
Debt Instrument, Interest Rate, Stated Percentage
Redemption of principal amount (as a percent)
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed
Redemption price (as a percent)
Debt Instrument, Redemption Price, Percentage
Debt issuance costs
Debt Issuance Costs, Gross
Stockholders' Equity
Stockholders' Equity Note Disclosure [Text Block]
Reconciliation of Income Used to Compute Basic and Diluted EPS
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Property and Equipment, Net
Property, Plant and Equipment Disclosure [Text Block]
Schedule of Valuation and Qualifying Accounts
Schedule of Valuation and Qualifying Accounts [Table Text Block]
Schedule of Valuation and Qualifying Accounts [Table Text Block]
Schedules of Lease Cost
Lease, Cost [Table Text Block]
Schedule of Future Minimum Operating Lease Payments
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Liability Class [Axis]
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Measurement Frequency [Domain]
Fair Value, Measurements, Recurring
Fair Value, Recurring [Member]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Level 1
Fair Value, Inputs, Level 1 [Member]
Level 2
Fair Value, Inputs, Level 2 [Member]
Level 3
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure [Abstract]
Current derivative instruments
Derivative Asset, Current
Long-term derivative instruments
Derivative Asset, Noncurrent
Total assets
Other Assets, Fair Value Disclosure
Liabilities, Fair Value Disclosure [Abstract]
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration liability
Business Combination, Contingent Consideration, Liability, Noncurrent
Current derivative instruments
Derivative Liability, Current
Long-term derivative instruments
Derivative Liability, Noncurrent
Long-term deferred compensation costs
Deferred Compensation Liability, Classified, Noncurrent
Total liabilities
Financial Liabilities Fair Value Disclosure
Stock options granted (in shares)
Stock options granted, weighted average grant date fair value (in dollars per share)
Total Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Fair Value
share-based compensation arrangement by share-based payment award, options, grants in period, grant date fair value
Income tax expense computed at U.S. federal statutory rate
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Increases (reductions) resulting from:
Effective Income Tax Rate Reconciliation, Amount [Abstract]
State and local income taxes, net of federal tax
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Foreign income taxes, net of federal tax
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount
Meals and entertainment
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount
Re-measurement of deferred taxes related to the 2017 Tax Act
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount
Excess tax benefits from stock-based compensation
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount
Research and development and other federal credits
Effective Income Tax Rate Reconciliation, Tax Credit, Amount
Executive compensation -162(M)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation Cost, Amount
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation Cost, Amount
IRS audit settlement
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount
Foreign-Derived Intangible Income (FDII)
Effective Income Tax Rate Reconciliation, Foreign Derived Intangible Income
Effective Income Tax Rate Reconciliation, Foreign Derived Intangible Income
Changes in uncertain tax positions
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Federal statutory income tax rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Total
2021
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
2022
Long-term Debt, Maturities, Repayments of Principal in Year Two
2023
Long-term Debt, Maturities, Repayments of Principal in Year Three
2024
Long-term Debt, Maturities, Repayments of Principal in Year Four
2025
Long-term Debt, Maturities, Repayments of Principal in Year Five
Thereafter
Long-term Debt, Maturities, Repayments of Principal after Year Five
2021
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
2022
Finite-Lived Intangible Assets, Amortization Expense, Year Two
2023
Finite-Lived Intangible Assets, Amortization Expense, Year Three
2024
Finite-Lived Intangible Assets, Amortization Expense, Year Four
2025
Finite-Lived Intangible Assets, Amortization Expense, Year Five
Thereafter
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
Total estimated amortization expense
Finite-Lived Intangible Assets, Net, Excluding Assets Not Yet Placed in Service
Finite-Lived Intangible Assets, Net, Excluding Assets Not Yet Placed in Service
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table]
Schedule of Earnings Per Share Basic And Diluted by Common Class [Table]
Schedule of Earnings Per Share Basic And Diluted by Common Class [Table]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Schedule of Earnings Per Share Basic And Diluted by Common Class [Line Items]
Schedule of Earnings Per Share Basic And Diluted by Common Class [Line Items]
Earnings for basic computations
Undistributed Earnings, Basic
Weighted-average common shares outstanding for basic computations (in shares)
Weighted Average Number of Shares Outstanding, Basic
Earnings for diluted computations
Undistributed Earnings, Diluted
Dilutive stock options and restricted stock (in shares)
Weighted Average Number Diluted Shares Outstanding Adjustment
Weighted-average common shares outstanding for diluted computations (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Earnings per common share
Earnings Per Share, Basic and Diluted [Abstract]
Unvested shares participating in the payment of the Company's dividends declared
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights
Cash dividends paid
Undistributed earnings (loss) allocated to participating securities, basic
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic
Undistributed earnings (loss) allocated to participating securities, diluted
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted
Antidilutive options excluded from the computation of EPS (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Summary of Accounts Receivable, Net
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Director
Director [Member]
Restricted Stock Units (RSUs)
Restricted Stock Units (RSUs) [Member]
Stock option expiration period
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
Stock option vesting period
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Fair value of options vested
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value
Intrinsic value of options exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Options available for future grant (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Restricted stock granted (in shares)
Aggregate fair value of all awards issued
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Grant date share price (in dollars per share)
Share Price
Repurchase of common stock
Treasury Stock, Value, Acquired, Cost Method
Schedule of Accounts Payable and Other Accrued Expenses
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
2021
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months
2022
Lessee, Operating Lease, Liability, Payments, Due Year Two
2023
Lessee, Operating Lease, Liability, Payments, Due Year Three
2024
Lessee, Operating Lease, Liability, Payments, Due Year Four
2025
Lessee, Operating Lease, Liability, Payments, Due Year Five
Thereafter
Lessee, Operating Lease, Liability, Payments, Due after Year Five
Total future lease payments
Lessee, Operating Lease, Liability, Payments, Due
Less: imputed interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Total lease liabilities
Health care cost trend rate assumed for next year, Pre 65
Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Pre 65
Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Pre 65
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Pre 65
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Pre 65
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Pre 65
Health care cost trend rate assumed for next year, Post 65
Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Post 65
Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Post 65
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Post 65
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Post 65
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Post 65
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Affiliated Entity
Affiliated Entity [Member]
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Pledge Obligation
Pledge Obligation [Member]
Pledge Obligation [Member]
Services Performed Under Subcontractor
Services Performed Under Subcontractor [Member]
Services Performed Under Subcontractor [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Number of directors
Number of Directors
Number of Directors
Number of directors appointable
Number of Directors Appointable
Number of Directors Appointable
Amount of pledge
Due to Affiliate, Current
Amount of related party transaction
Related Party Transaction, Amounts of Transaction
Accounts Receivable, Net of Allowance
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Revenue
Operating income
Income before income taxes
Earnings per common share:
Debt
Debt Disclosure [Text Block]
Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Contract with Customer, Asset and Liability
Contract with Customer, Asset and Liability [Table Text Block]
Useful life
Property, Plant and Equipment, Useful Life
Statement [Table]
Statement [Table]
Common Stock
Common Stock [Member]
Treasury Stock
Treasury Stock [Member]
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Retained Earnings
Retained Earnings [Member]
Accumulated Other Comprehensive Loss
Statement [Line Items]
Statement [Line Items]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)
Shares, Outstanding
Issuance of common stock (in shares)
Stock Issued During Period, Shares, New Issues
Issuance of common stock
Stock Issued During Period, Value, New Issues
Stock options exercised (in shares)
Stock options exercised
Stock Issued During Period, Value, Stock Options Exercised
Repurchase of common stock (in shares)
Repurchase of common stock
Recognition of liability related to future stock option exercises
Adjustments To Additional Paid In Capital Recognition Of Liability Related To Future Stock Option Exercises
Adjustments To Additional Paid In Capital Recognition Of Liability Related To Future Stock Option Exercises
Recognition of liability related to future restricted stock units vesting
Adjustments To Additional Paid In Capital, Recognition Of Liability Related To Future Restricted Stock Units Vesting
Adjustments To Additional Paid In Capital, Recognition Of Liability Related To Future Restricted Stock Units Vesting
Reclassification of AOCI due to the 2017 Tax Act (Note 16)
Cumulative Effect of New Accounting Principle in Period of Adoption
Other comprehensive loss, net of tax
Other Comprehensive Income (Loss), Net of Tax
Dividends paid
Dividends, Cash
Stock-based compensation expense
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Balance (in shares)