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Obligation, Percentage Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Dividends paid Dividends, Common Stock, Cash Total stockholders’ equity Beginning of period End of period Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] OCI before reclassifications, net of income taxes OCI, before Reclassifications, Net of Tax, Attributable to Parent Other comprehensive (loss) gain, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common stock, authorized (in shares) Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Increase (decrease) in income tax reserves Increase (Decrease) In Income Tax Reserves Increase 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not require Recovery Restatement Does Not Require Recovery [Text Block] Notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] 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 Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accrued expenses Accrued Liabilities, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Contract Assets and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative expenses General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Disposed of by Sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Cost of revenue Cost of Sales [Member] Cash Flow Hedging Cash Flow Hedging [Member] Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] Schedule of Earnings Per Share Basic And Diluted by 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Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Long-term deferred compensation plan asset Deferred Compensation Plan Assets Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Software Computer Software, Intangible Asset [Member] Other Other Employee-related Liabilities, Current Stock options exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Equity [Abstract] Equity [Abstract] Revenue Revenue from Contract with Customer [Policy Text Block] Building Building [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] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Senior Notes due 2029 Senior Notes Due 2029 [Member] Senior Notes Due 2029 Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accrued retirement Liability, Pension and Other Postretirement and Postemployment Benefits, Current Deferred tax assets Deferred Income Tax Assets, Net Contractual obligation, term Contractual Obligation, Term Contractual Obligation, Term Schedule of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Purchases of property, equipment, and software Payments to Acquire Productive Assets Depreciation and amortization Depreciation, Depletion and Amortization Accrual of interest on long term receivable Increase (Decrease) in Income Taxes Receivable Other long-term assets Other Assets, Noncurrent Accrued interest Interest Payable, Current Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fixed-price Fixed-Price Contract [Member] Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Net payments for investments Payments for (Proceeds from) Investments Prepaid expenses and other current and long-term assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number Triggering Event [Domain] Triggering Event [Domain] Triggering Event Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Accounts receivable–unbilled (contract assets) Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Schedule of Accrued Compensation and Benefits Schedule of Accrued Compensation And Benefits [Table Text Block] Schedule of Accrued Compensation And Benefits [Table Text Block] ASSETS Assets [Abstract] Long-term debt, net of current portion Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Fair Value Measurements Fair Value Disclosures [Text Block] Credit Facility [Domain] Credit Facility [Domain] Gross Carrying Value Finite-Lived Intangible Assets, Gross Stockholders’ equity: Equity, Attributable to Parent [Abstract] Current derivative instruments Derivative Liability, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Repurchase of common stock Repurchase of common stock Treasury Stock, Value, Acquired, Cost Method Estimated amounts to be reclassified over 12 months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Accumulated Other Comprehensive Income (Loss) Total AOCI Attributable to Parent [Member] Interest Rate Debt Instrument, Interest Rate, Stated Percentage Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Senior Notes due 2028 Senior Notes Due 2028 [Member] Senior Notes Due 2028 Fair Value as of Grant Date Award Grant Date Fair Value Total accounts receivable, net Accounts Receivable, after Allowance for Credit Loss Entity Registrant Name Entity Registrant Name Earnings for basic computations Undistributed Earnings, Basic Stock 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Restructuring and Related Costs [Table Text Block] Civil Customers Civil Clients [Member] Civil Clients [Member] Lease not yet commenced, term of contract Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Earnings for diluted computations Undistributed Earnings, Diluted Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Contract with customer, liability, revenue recognized Contract with Customer, Liability, Revenue Recognized Accrued compensation and benefits Increase (Decrease) in Employee Related Liabilities MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Cash paid and other Payments for Restructuring Restructuring Type [Axis] Restructuring Type [Axis] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Noncash lease expense Noncash Lease Expense Noncash Lease Expense Customer contracts and related customer relationships Customer Contracts and Related Customer Relationships [Member] Customer Contracts and Related Customer Relationships Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Financial Instruments [Domain] Financial Instruments [Domain] Income taxes Other Comprehensive Income (Loss) before Reclassifications, Tax Litigation Case [Axis] Litigation Case [Axis] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Schedule of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Subcontractor Sales Channel, Through Intermediary [Member] Company Selected Measure Name Company Selected Measure Name Senior Notes Senior Notes Senior Notes [Member] Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Cost-reimbursable Cost Reimbursable Contract [Member] Cost Reimbursable Contract All Executive Categories All Executive Categories [Member] Long-term income tax receivable Income Taxes Receivable, Noncurrent Common stock, Class A - $0.01 par value - authorized: 600,000,000 shares; issued: 169,274,466 and 168,522,544 shares at December 31, 2025 and March 31, 2025, respectively; outstanding: 120,863,944 and 124,879,004 shares at December 31, 2025 and March 31, 2025, respectively Common Stock, Value, Issued Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Weighted-average common stock shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies (Note 12) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Senior Notes due 2035 Five Point Nine Five Percent Senior Unsecured Notes Due 2035 [Member] Five Point Nine Five Percent Senior Unsecured Notes Due 2035 Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Concentration Risk [Line Items] Concentration Risk [Line Items] Billable expenses Billable Expenses Billable expenses include direct subcontractor expenses, travel expenses, and other expenses incurred to perform on contracts. 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[Domain] Derivative Contract [Domain] Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Revenue Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Total current assets Assets, Current Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Provision for claimed costs Liability for reductions and/or penalties from U.S Government audits Loss Contingency Accrual Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Defense Customers Defense Clients [Member] Defense Clients [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Current-period OCI, net of income taxes Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Current liabilities: Liabilities, Current [Abstract] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Revolving credit facility, amount outstanding Long-Term Line of Credit Net gains on investments, dispositions, and other Gain (Loss) on Disposition of Assets Diluted (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Senior Notes due 2033 Five Point Nine Five Percent Senior Unsecured Notes Due 2033 [Member] Five Point Nine Five Percent Senior Unsecured Notes Due 2033 Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] Treasury stock (in shares) Treasury stock (in shares) Treasury stock (in shares) Treasury Stock, Common, Shares Earnings per share of common stock (Note 4): Earnings Per Share [Abstract] Earnings Per Share [Abstract] Customer [Domain] Contract with Customer, Sales Channel [Domain] Additional Financial Information Disclosure [Abstract] Additional Financial Information Disclosure Other long-term assets Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent [Abstract] Accounts Payable and Other Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Repurchase of common stock (in shares) Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired Income taxes Income Taxes Paid, Net Award Timing Disclosures [Line Items] Research and Development Tax Credits Research and Development Tax Credits [Member] Research and Development Tax Credits And Deduction Of Foreign Derived Intangible Income Outstanding Balance Long-Term Debt, Gross DARPA SETA DARPA SETA [Member] DARPA SETA Measurement Frequency [Domain] Measurement Frequency [Domain] Accrued compensation and benefits Total accrued compensation and benefits Employee-related Liabilities, Current Trade name Trade Names [Member] Net income Net income Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Other current and long-term liabilities Increase (Decrease) in Other Operating Liabilities Property and equipment, net of accumulated depreciation Property, Plant and Equipment, Net Restructuring charges Severance and related charges incurred during the period Restructuring Charges Repurchases of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable, net Increase (Decrease) in Accounts Receivable Restructuring Cost [Table] Restructuring Cost [Table] Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Entity Current Reporting Status Entity Current Reporting Status 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