Fair Value Disclosures [Abstract]
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]
Other noncurrent liabilities
Other Noncurrent Liabilities [Member]
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, Measurements, Fair Value Hierarchy [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]
Long term deferred compensation costs
Deferred Compensation Plan Assets
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
Compensation Related Costs [Abstract]
Accrued Compensation and Benefits
Compensation Related Costs, General [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 (expense) income, 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 4):
Earnings Per Share [Abstract]
Basic (in dollars per share)
Earnings Per Share, Basic
Diluted (in dollars per share)
Earnings Per Share, Diluted
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Interest Rate Swap
Interest Rate Swap [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Designated as Hedging Instrument
Designated as Hedging Instrument [Member]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Cash Flow Hedging
Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain or (Loss) Recognized in AOCL on Derivatives
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
Amount of Gain or (Loss) Reclassified from AOCL into Income
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net
Interest Expense on Condensed Consolidated Statements of Operations
Income Tax Disclosure [Abstract]
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 2016-2021 [Member]
Tax Years 2016-2019 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards [Line Items]
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Federal statutory rate (as a percent)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Income tax assessments
Income Tax Examination, Estimate of Possible Loss
Income tax uncertainty
Liability for Uncertainty in Income Taxes, Noncurrent
Reserve for uncertain tax positions, research and development tax credits
Liability For Uncertainty In Income Taxes, Noncurrent, Research And Development Tax Credits
Liability For Uncertainty In Income Taxes, Noncurrent, Research And Development Tax Credits
Reserve for uncertain tax positions, acquisitions
Liability For Uncertainty In Income Taxes, Noncurrent, Acquisitions
Liability For Uncertainty In Income Taxes, Noncurrent, Acquisitions
Revenue from Contract with Customer [Abstract]
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
Other Liabilities Disclosure [Abstract]
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
Retirement Benefits [Abstract]
Employee Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
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
Equity [Abstract]
Schedule of accumulated other comprehensive loss
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Reclassification out of accumulated other comprehensive loss to net income
Reclassification out of Accumulated Other Comprehensive Income [Table 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
Intangible Assets, Net (Excluding Goodwill)
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
Long-term Debt, Current Maturities
Accounts payable and other accrued expenses
Accrued compensation and benefits
Employee-related Liabilities, Current
Operating lease liabilities
Operating Lease, Liability, Current
Other current liabilities
Other Liabilities, Current
Total current liabilities
Liabilities, Current
Long-term debt, net of current portion
Long-term Debt, Excluding Current Maturities
Operating lease liabilities, net of current portion
Operating Lease, Liability, Noncurrent
Other long-term liabilities
Total liabilities
Liabilities
Commitments and contingencies (Note 18)
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, 161,856,727 shares at June 30, 2020 and 161,333,973 shares at March 31, 2020; outstanding, 138,196,736 shares at June 30, 2020 and 138,719,921 shares at March 31, 2020
Common Stock, Value, Issued
Treasury stock, at cost — 23,659,991 at June 30, 2020 and 22,614,052 shares at March 31, 2020
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
Stockholders' Equity Attributable to Parent
Total liabilities and stockholders’ equity
Liabilities and Equity
Reconciliation of the income used to compute basic and diluted EPS
Schedule of Earnings Per Share, Basic and Diluted [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
Debt Instrument, Interest Rate, Effective Percentage
Long-term debt outstanding
Long-term Debt, Gross
Less: Unamortized debt issuance costs and discount on debt
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Total
Long-term Debt
Less: Current portion of long-term debt
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]
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]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
Stock options
Share-based Payment Arrangement, Option [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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Common stock, authorized (in shares)
Common Stock, Shares Authorized
Common stock, issued (in shares)
Common Stock, Shares, Issued
Common stock, outstanding (in shares)
Common Stock, Shares, Outstanding
Treasury stock (in shares)
Treasury Stock, Shares
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
Summary 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]
Contract assets:
Contract with Customer, Asset, after Allowance for Credit Loss [Abstract]
Current
Contract with Customer, Asset, Net, Current
Long-term
Contract with Customer, Asset, Net, Noncurrent
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
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounting Estimates
Use of Estimates, Policy [Policy Text Block]
Recently Adopted Accounting Standards and Recent Accounting Pronouncements Not Yet Adopted
New Accounting Pronouncements, Policy [Policy Text Block]
Receivables [Abstract]
Accounts Receivable, Net of Allowance
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Earnings Per Share
Earnings Per Share [Text Block]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Restricted stock units (RSUs)
Restricted Stock Units (RSUs) [Member]
Options granted during period (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Fair value of options granted
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
Estimated fair value per option granted (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Stock options outstanding (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Stock options outstanding, unvested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares
Restricted stock granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Restricted stock, total fair value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value
Stock price on grant date (in dollars per share)
Share Price
Repurchase of common stock (in shares)
Treasury Stock, Shares, Acquired
Repurchase of common stock, value
Treasury Stock, Value, Acquired, Cost Method
Stock purchased by employees (in shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans
Revolving Credit Facility
Revolving Credit Facility [Member]
Interest expense on debt
Interest Expense, Debt
Deferred payment on obligation interest
Deferred Payment Obligation, Interest Payment
Deferred Payment Obligation, Interest Payment
Amortization of Debt Issuance Cost (DIC) and Original Issue Discount (OID)
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
Cover [Abstract]
Document Type
Document Type
Document Quarterly Report
Document Quarterly 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 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 Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Current Fiscal Year End Date
Current Fiscal Year End Date
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
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities
Operating Lease, Payments
Operating lease liabilities arising from obtaining ROU assets
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Weighted average remaining lease term (in years)
Operating Lease, Weighted Average Remaining Lease Term
Weighted average discount rate (as a percent)
Operating Lease, Weighted Average Discount Rate, Percent
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
Summary of Stock-Based Compensation Expense Recognized in the Condensed 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]
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Statement [Line Items]
Statement [Line Items]
Dividends paid (in dollars per share)
Common Stock, Dividends, Per Share, Cash Paid
Related Party Transactions [Abstract]
Related-Party Transactions
Related Party Transactions Disclosure [Text Block]
Accounts Payable and Other Accrued Expenses
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
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
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
Schedule of Accounts Payable and Accrued Liabilities
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Remainder of 2021
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year
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
Operating Lease, Liability
Schedule of Derivative Instruments
Schedule of Derivative Instruments [Table Text Block]
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]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Post-retirement Plans
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Derivatives designated as cash flow hedges
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes
Tax (benefit) expense
Basis of Presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
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]
Senior Notes due 2025
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
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
Period for premium payable in connection with repricing transactions
Debt Instrument, Debt Covenant, Premium Payable For Repricing Transactions, Term
Debt Instrument, Debt Covenant, Premium Payable For Repricing Transactions, Term
Revolving credit facility, maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Long-term debt, maximum expanded loan facility
Long-term Debt, Maximum Expanded Loan Facility
Long-Term Debt, Maximum Expanded Loan Facility
Percentage of consolidated EBITDA required for expansion of loan
Debt Covenant, Expanded Loan, Percentage of Consolidated EBITDA Required
Debt Covenant, Expanded Loan, Percentage of Consolidated EBITDA Required
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 lines 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 payments
Interest Paid, Including Capitalized Interest, Operating and Investing Activities
Face amount of debt
Debt Instrument, Face Amount
Debt instrument, stated percentage
Debt Instrument, Interest Rate, Stated Percentage
Redemption price (as a percent)
Debt Instrument, Redemption Price, Percentage
Debt issuance costs
Debt Issuance Costs, Gross
Notional amount of interest rate swaps
Derivative, Notional Amount
Current assets
Contract with Customer, Asset, Net, Current [Abstract]
Accounts receivable–billed
Billed Contracts Receivable
Accounts receivable–unbilled
Allowance for doubtful accounts
Accounts Receivable, Allowance for Credit Loss, Current
Accounts receivable, net of allowance
Other long-term assets
Contract with Customer, Asset, Net, Noncurrent [Abstract]
Accounts receivable–unbilled
Total accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss
Provision for doubtful accounts
Accounts Receivable, Credit Loss Expense (Reversal)
Cumulative Effect, Period Of Adoption [Axis]
Cumulative Effect, Period Of Adoption [Axis]
Cumulative Effect, Period Of Adoption [Axis]
Cumulative Effect, Period Of Adoption [Domain]
Cumulative Effect, Period Of Adoption [Domain]
[Domain] for Cumulative Effect, Period Of Adoption [Axis]
Cumulative Effect, Period Of Adoption, Adjustment
Cumulative Effect, Period Of Adoption, Adjustment [Member]
Cumulative Effect, Period Of Adoption, Adjustment [Member]
Treasury Stock
Treasury Stock [Member]
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Retained Earnings
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (shares)
Shares, Outstanding
Beginning of period
Issuance of common stock (shares)
Stock Issued During Period, Shares, New Issues
Issuance of common stock
Stock Issued During Period, Value, New Issues
Stock options exercised (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Stock options exercised
Stock Issued During Period, Value, Stock Options Exercised
Repurchase of common stock (shares)
Repurchase of common stock
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
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
Net income
Other comprehensive income (loss), net of tax
Other Comprehensive Income (Loss), Net of Tax
Dividends paid per common share
Dividends, Cash
Stock-based compensation expense
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Ending balance (shares)
End of period
Fair Value Measurements
Fair Value Disclosures [Text Block]
Statement of Cash Flows [Abstract]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
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
Amortization of debt issuance costs
Amortization of Debt Issuance Costs and Loss On Debt Extinguishment
Amortization of Debt Issuance Costs and Loss On Debt Extinguishment
Losses 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
Deferred income taxes and income taxes receivable / payable
Increase (Decrease) in Income Taxes
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
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
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
Net cash (used in) provided by financing activities
Net Cash Provided by (Used in) Financing Activities
Net (decrease) increase in cash and cash equivalents
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect
Cash and cash equivalents––beginning of period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and cash equivalents––end of period
Supplemental disclosures of cash flow information
Supplemental Cash Flow Information [Abstract]
Net cash paid (refunded) during the period for:
Cash Payments Abstract
Cash paid during the period for:
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
Business Overview
Nature of Operations [Text Block]
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]
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]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
UNITED STATES
UNITED STATES
Contract with Customer, Sales Channel [Axis]
Contract with Customer, Sales Channel [Axis]
Customer [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]
Total revenue (as a percent)
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage
Employer matching contribution, percent 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
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]
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Supplemental Employee Retirement Plan
Supplemental Employee Retirement Plan [Member]
Other Postretirement Benefits Plan
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
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
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Total postretirement medical expense
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Defined benefit plan, unfunded status of plan
Defined Benefit Plan, Funded (Unfunded) Status of Plan
Long-term disability obligation
Postemployment Benefits Liability, Noncurrent
Maximum eligible deferral of compensation, percentage
Deferred Compensation Plans, Maximum Eligible Deferral of Compensation, Percentage
Deferred Compensation Plans, Maximum Eligible Deferral of Compensation, Percentage
Deferred compensation plan, assets
Deferred compensation plan, liabilities
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]
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
Payments to related party
Related Party Transaction, Amounts of Transaction
Components of net postretirement medical expense
Schedule of Net Benefit Costs [Table Text Block]
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized (loss) gain on derivatives designated as cash flow hedges
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Change in postretirement plan costs
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Total other comprehensive income (loss), net of tax
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Debt
Debt Disclosure [Text Block]
Schedule of Recurring Fair Value Measurements
Fair Value Measurements, Recurring and Nonrecurring [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]
Schedule of Debt
Schedule of Debt [Table Text Block]
Schedule of Interest Expense
Interest Income and Interest Expense Disclosure [Table Text Block]
Leases
Lessee, Operating Leases [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]
Schedule of Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Summary of Contract Balances
Contract with Customer, Asset and Liability [Table Text Block]
Stock-Based Compensation
Share-based Payment Arrangement [Text Block]
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table]
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [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 Reconciliation [Abstract]
Unvested shares participating in the payment of the Company's dividends declared (in shares)
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights
Unvested shares, cash dividends paid
Undistributed earnings allocated to participating securities, basic
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic
Undistributed earnings 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
Number of reportable segments
Number of Operating Segments
Number of employees
Entity Number of Employees
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
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Post-retirement plans
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Totals
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]
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
Other comprehensive income (loss) before reclassifications, tax
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent
Derivative [Table]
Derivative [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Current Liabilities
Other Current Liabilities [Member]
Other Noncurrent Liabilities
Derivative [Line Items]
Derivative [Line Items]
Fair value of derivative liabilities
Derivative Instruments in Hedges, Liabilities, at Fair Value
Estimate of amount to be reclassified over the next 12 months
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Other Long-Term Liabilities
Other Liabilities Disclosure [Text Block]
Schedule of Accounts Receivable, Net of Allowance
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Revenue
Revenue from Contract with Customer [Text Block]
Income Taxes
Income Tax Disclosure [Text Block]