Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Title of 12(b) Security Title of 12(b) Security Subsequent event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Remaining performance obligations, expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument Financial Instrument [Axis] Customer Customer [Axis] Business Segment Information [Abstract] Segment Reporting [Abstract] Common stock $0.10 par value, 80,000 shares authorized; 43,275 shares issued and 22,101 outstanding at September 30, 2026 and 43,273 shares issued and 22,099 outstanding at June 30, 2026 Common Stock, Value, Issued Payment of taxes for equity transactions Payment, Tax Withholding, Share-Based Payment Arrangement Accrued compensation and benefits Employee-related Liabilities, Current Cash provided (used) by MARPA Cash Provided By (Used From) M A R P A Cash provided (used) by MARPA. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Line of credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Derivative Instrument Derivative Instrument [Axis] Contract with Customer, Basis of Pricing Contract with Customer, Basis of Pricing [Domain] Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Schedule of Interest Rate Swap Cash Flow Hedges Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Stand-y letters of credit, revolving credit sub-facility Standby Letters of Credit [Member] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Share Repurchase Program [Domain] Share Repurchase Program [Domain] Notional amount Derivative, Notional Amount Weighted-average basic shares outstanding (in shares) Weighted-average number of basic shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Contract assets – current unbilled receivables Contract with Customer, Asset, after Allowance for Credit Loss, Current Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Other Proceeds from Other Operating Activity Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Revenue from previously satisfied performance obligations Contract with Customer, Performance Obligation Satisfied in Previous Period Work in process Inventory, Work in Process, Net of Reserves Accrued compensation and benefits Increase (Decrease) in Accrued Salaries Net gains from AOCL to earnings Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Entity Address, City or Town Entity Address, City or Town EAC Adjustments Contracts Accounted for under Percentage of Completion [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Interest Rate Swap, 2.04% Interest Rate Swap, 2.04% [Member] Interest Rate Swap, 2.04% Nature of Operations and Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Intangible assets, net Net carrying value Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Federal civilian agencies Federal Civilian Agencies [Member] Federal civilian agencies. Level 2 Fair Value, Inputs, Level 2 [Member] Accumulated amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Credit facility maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Current portion of long-term debt Less current portion Long-Term Debt, Current Maturities Subsequent Event Type Subsequent Event Type [Axis] Effect of Change in Accounting Estimate, Type Effect of Change in Accounting Estimate, Type [Domain] Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] 2033 Notes 2033 Senior Unsecured Notes [Member] 2033 Senior Unsecured Notes Schedule of Summarized Financial Information of Reportable Segments Segment Reporting [Table Text Block] Total other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total long-term debt Long-Term Debt Non-cash financing and investing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Document Period End Date Document Period End Date Changes in operating assets and liabilities, net of effect of business acquisitions: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Costs of revenues: Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Treasury stock, at cost (21,174 and 21,174 shares, respectively) Treasury Stock, Common, Value Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Interest Rate Swap, 2.74% Interest Rate Swap, 2.74% [Member] Interest Rate Swap, 2.74% Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Sales of receivables Transfer Of Financial Assets Accounted For As Sales, Sale Of Receivables Transfer Of Financial Assets Accounted For As Sales, Sale Of Receivables Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Term Loan B Facility Term Loan B Facility [Member] Term Loan B Facility Remaining sold receivables Transfer Of Financial Assets Accounted For As Sales Remaining Sold Receivables Remaining sold receivables under the MARPA Facility. Total liabilities Liabilities Trading Symbol Trading Symbol 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Purchase price relating to net working capital Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Amounts reclassified from accumulated other comprehensive loss (AOCL) to earnings Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Interest Rate Swap, 3.79% Interest Rate Swap, 3.79% [Member] Interest Rate Swap, 3.79% Amortization of deferred financing costs Amortization of Debt Issuance Costs and Discounts Paid fixed rate Derivative, Fixed Interest Rate Principal amount of long-term debt Long-Term Debt, Gross Credit Facility Credit Facility [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Beginning balance (in shares) Ending balance (in shares) Shares, Issued Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted-average diluted shares outstanding (in shares) Weighted-average number of diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Change In Accounting Estimate [Line Items] Change in Accounting Estimate [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Proceeds from borrowings Proceeds from Lines of Credit International International Operations [Member] International operations. Interest Rate Swap, 3.71% Interest Rate Swap, 3.71% [Member] Interest Rate Swap, 3.71% Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Treasury stock Treasury Stock, Common [Member] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Dilutive effect of equity awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements All Executive Categories All Executive Categories [Member] Operating lease liabilities, net Increase (Decrease) in Operating Lease Liability Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Income taxes Increase (Decrease) in Income Taxes Receivable Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Business Segments Segment Reporting [Text Block] Expiration Date Trading Arrangement Expiration Date Hedging Relationship Hedging Relationship [Axis] Schedule of Disaggregated Revenues Disaggregation of Revenue [Table Text Block] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total shareholders’ equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Business Combination [Line Items] Business Combination [Line Items] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Supplemental retirement savings plan assets Deferred Compensation Plan Assets Exercise Price Award Exercise Price Cash collections Transfers Of Financial Assets Accounted For As Sales Cash Collected Amount of cash collected and remitted to the Purchaser as of the balance sheet date for sales of receivables under the MARPA Facility. CASH FLOWS FROM INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report 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] Commercial and other Commercial And Other [Member] Commercial and other. Segments Segments [Domain] Interest rate swap agreements Interest Rate Swap [Member] Long-term Debt Debt Disclosure [Text Block] Principal payments on borrowings Repayments of Long-Term Debt Contract assets – noncurrent unbilled receivables Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Less unamortized debt discount, premium, and issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Business Combination [Table] Business Combination [Table] Equity Component Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Term loans Secured Debt [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Total costs of revenues Costs and Expenses Adoption Date Trading Arrangement Adoption Date Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Billed and billable receivables Billed And Billable Receivables Billed and billable receivables. Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Remaining performance obligations, expected timing of satisfaction, periods one and two Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Periods One And Two Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Periods One And Two ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Goodwill acquired Goodwill, Measurement Period Adjustment Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred income taxes Deferred Income Tax Expense (Benefit) Indirect costs and selling expenses Selling, General and Administrative Expense Business Combination [Domain] Business Combination [Domain] Interest Rate Swap, 3.80% Interest Rate Swap, 3.80% [Member] Interest Rate Swap, 3.80% Department of War Department Of Defense [Member] Department of defense. Legal Proceedings and Other Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Contract assets – noncurrent costs to obtain Capitalized Contract Cost, Net, Noncurrent Schedule of Goodwill by Reportable Segment Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Business Combination [Axis] Business Combination [Axis] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Remaining performance obligations, expected satisfaction, percentage Revenue, Remaining Performance Obligation, Percentage Direct costs Direct Operating Costs Income Statement [Abstract] Income Statement [Abstract] Treasury stock issued under stock purchase plans (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Same-day swing line loan, revolving credit sub-facility Same Day Swing Line Loan [Member] Represent same-day swing line loan sub facility of revolving credit facility. Debt instrument, periodic payment Debt Instrument, Periodic Payment Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Interest Rate Swap, 3.67% Interest Rate Swap, 3.67% [Member] Interest Rate Swap, 3.67% Schedule of Intangible Assets Intangible Asset, Finite-Lived [Table Text Block] City Area Code City Area Code Accumulated other comprehensive loss AOCI Attributable to Parent [Member] Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Subsequent Event Subsequent Events [Text Block] Term Loan B Term Loan B [Member] Term Loan B Name Forgone Recovery, Individual Name Finished goods Inventory, Finished Goods, Net of Reserves Customer contracts and related customer relationships Customer Contracts And Related Customer Relationships [Member] Represents information about customer contracts and related customer relationships. Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Contract with Customer, Asset and Liability [Abstract] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] Statement [Line Items] Statement [Line Items] Total assets Assets Bank credit facility Bank Credit Facility [Member] Represents bank credit facility. Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Accounting Standards Update and Change in Accounting Principle [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Operating segments Operating Segments [Member] Interest expense and other, net Interest Expense, Nonoperating Proceeds from employee stock purchase plans Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised Treasury stock issued under stock purchase plans Stock Issued During Period, Value, Employee Stock Purchase Plan Gain recognized in other comprehensive income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Interest Rate Swap, 1.80% Interest Rate Swap, 1.80% [Member] Interest Rate Swap, 1.80% PEO PEO [Member] Interest Rate Swap, 3.81% Interest Rate Swap, 3.81% [Member] Interest Rate Swap, 3.81% Other liabilities Other Liabilities, Noncurrent Goodwill Beginning balance Ending balance Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Liability, revenue recognized Contract with Customer, Liability, Revenue Recognized Subsequent Event Type Subsequent Event Type [Domain] Retained earnings Retained Earnings [Member] Operating lease liabilities Operating Lease, Liability, Noncurrent Revolving Facility Revolving credit facility Revolving Credit Facility [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Cash flow hedging Cash Flow Hedging [Member] Amortization expense Intangible Asset, Finite-Lived, Amortization Expense Finite Lived Intangible Assets [Line Items] Intangible Asset, Finite-Lived [Line Items] Increase in tax liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Supplemental retirement savings plan obligations, net of current portion Deferred Compensation Liability, Classified, Noncurrent Income tax expense (benefit) Reclassification from AOCI, Current Period, Tax CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant, and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Revenues Revenue from Contract with Customer, Excluding Assessed Tax Remaining performance obligations, expected satisfaction, percentage, periods one and two Revenue, Remaining Performance Obligation, Percentage, Periods One and Two Revenue, Remaining Performance Obligation, Percentage, Periods One and Two Expertise Service, Other [Member] Long-term liabilities Increase Decrease In Long Term Liabilities Increase decrease in long term liabilities. Financial Instruments [Domain] Financial Instruments [Domain] Interest rate swap agreements Derivative Asset Inventories Inventory Disclosure [Text Block] Intangible Asset, Finite-Lived, Class Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Revenues Revenue from Contract with Customer [Text Block] Term loan B principal payment Debt Instrument, Periodic Payment, Principal Address Type [Domain] Address Type [Domain] Schedule Of Segment Reporting Information By Segment [Table] Segment Reporting [Table] Contract with Customer, Sales Channel Contract with Customer, Sales Channel [Axis] Interest Rate Swap, 1.98% Interest Rate Swap, 1.98% [Member] Interest Rate Swap, 1.98% Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Income from operations Income from operations Operating Income (Loss) Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Acquisitions Business Combination [Text Block] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Treasury stock, shares at cost (in shares) Beginning balance (in shares) Ending balance (in shares) Treasury Stock, Common, Shares Contract with Customer, Basis of Pricing Contract with Customer, Basis of Pricing [Axis] Transition period Transition Report Period Transition Report Period Equity Components Equity Components [Axis] Accounts receivable, net Increase (Decrease) in Accounts Receivable Product and Service Product and Service [Domain] Cash paid during the period for income taxes, net of refunds Income Tax Paid, after Refund Received Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Reduction in inventory Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory Subsequent Events [Abstract] Subsequent Events [Abstract] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Vesting of restricted stock units, net of tax withholdings Restricted Stock, Value, Shares Issued Net of Tax Withholdings MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other Assets, Noncurrent Document Type Document Type Acquisitions of businesses, net of cash acquired Payments to acquire businesses Payments to Acquire Businesses, Net of Cash Acquired 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] Fixed-price Fixed-Price Contract [Member] Fair Value as of Grant Date Award Grant Date Fair Value Contingent Consideration Contingent Consideration [Member] Contingent Consideration Schedule Of Goodwill [Table] Goodwill [Table] Schedule Of Change In Accounting Estimate [Table] Change in Accounting Estimate [Table] Principal payments are due in quarterly installments Line of Credit Facility, Periodic Payment, Principal Transfers and Servicing of Financial Assets [Abstract] Transfers and Servicing of Financial Assets [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Share repurchase program, remaining authorized amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] ARKA Group L.P ARKA Group L.P [Member] ARKA Group L.P Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Contract liabilities – noncurrent deferred revenue and other contract liabilities Contract with Customer, Liability, Noncurrent Consolidation Items [Axis] Consolidation Items [Axis] Contract assets – current costs to obtain Capitalized Contract Cost, Net, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income before income taxes Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies Commitments and Contingencies Cash collected, not remitted to purchaser Transfers Of Financial Assets Accounted For As Sales Cash Collected Not Remitted To Purchaser Cash collections not remitted to the Purchaser for sales of receivables under the MARPA Facility. Gross carrying value Intangible Asset, Finite-Lived, before Accumulated Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accounts payable and other accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Intelligence Community Intelligence Community [Member] Intelligence Community Goodwill [Roll Forward] Goodwill [Roll Forward] LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class Intangible Asset, Finite-Lived, Class [Domain] Schedule of Recurring Fair Value Measurements Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Total Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Repurchases of common stock (in shares) Treasury Stock, Shares, Acquired Remaining Performance Obligations [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Cost-plus-fee Cost Plus Fee Contract [Member] Cost plus fee contract. Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Term Loan B-2 Term Loan B-2 [Member] Term Loan B-2 Vesting of restricted stock units, net of tax withholdings (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Repurchases of common stock Treasury Stock, Value, Acquired, Cost Method Transfer of Financial Assets Accounted for as Sales, Amount [Roll Forward] Transfer of Financial Assets Accounted for as Sales, Amount [Roll Forward] Transfer of Financial Assets Accounted for as Sales, Amount Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Other accrued expenses and current liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Nature of Operations and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Prime contractor Prime Contractor [Member] Prime contractor. Schedule of Long-term Debt Schedule of Debt [Table Text Block] Customer Customer [Domain] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Long-Term Debt, Type Long-Term Debt, Type [Domain] Basic earnings per share (in dollars per share) Earnings Per Share, Basic Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Contract liabilities – current deferred revenue and other contract liabilities Contract with Customer, Liability, Current Repurchases of common stock Payments for Repurchase of Common Stock Total current assets Assets, Current Insider Trading Arrangements [Line Items] Schedule of Cash Flow Hedges Derivative Instruments, Gain (Loss) [Table Text Block] Long-term debt, net of current portion Long-term debt, net of current portion Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Other comprehensive income (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Product and Service Product and Service [Axis] Domestic Domestic Operations [Member] Domestic operations. Increase (decrease) in contingent consideration Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Changes in fair value of interest rate swap agreements, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Contingent consideration Business Combination, Contingent Consideration, Liability Change in Accounting Estimate by Type (Axis) Effect of Change in Accounting Estimate, Type [Axis] Former Address Former Address [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Interest Rate Swap, 1.69% Interest Rate Swap, 1.69% [Member] Interest Rate Swap, 1.69% Cover [Abstract] Cover [Abstract] Derivative Contract Derivative Contract [Domain] Foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Remaining Performance Obligations [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Hedging Relationship Hedging Relationship [Domain] Total liabilities and shareholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments Segments [Axis] Measurement adjustments in finalization of purchase consideration Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Landlord sponsored tenant incentives Landlord Sponsored Tenant Incentives Landlord sponsored tenant incentives. Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Schedule of MARPA Activity Transfer of Financial Assets Accounted for as Sales [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Accrued capital expenditures Capital Expenditures, Non-Cash Capital Expenditures, Non-Cash Shareholders’ equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] John S. Mengucci [Member] John S. Mengucci Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock $0.10 par value, 10,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Beginning balance Outstanding balance sold to purchaser Transfer Of Financial Assets Accounted For As Sales Amount Outstanding Amount outstanding as of the balance sheet date for sales of receivables under the MARPA Facility. Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Technology Technology Service [Member] Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] 2023 Repurchase Program 2023 Repurchase Program [Member] 2023 Repurchase Program Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Impairments of goodwill Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Raw materials Inventory, Raw Materials, Net of Reserves Interest Rate Swap, 2.14% Interest Rate Swap, 2.14% [Member] Interest Rate Swap, 2.14% Company Selected Measure Amount Company Selected Measure Amount Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 2033 Notes-2 2033 Senior Unsecured Notes-2 [Member] 2033 Senior Unsecured Notes-2 Contract with Customer, Sales Channel Contract with Customer, Sales Channel [Domain] Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Senior notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One MARPA maximum commitment Transfers Of Financial Assets Accounted For As Sales Marpa Maximum Commitment MARPA maximum commitment. Income taxes Income Tax Expense (Benefit) Acquired technologies Technology-Based Intangible Assets [Member] Award Timing Method Award Timing Method [Text Block] Net change in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Sales of Receivables Transfers and Servicing of Financial Assets [Text Block] Time-and-materials Time-and-Materials Contract [Member] Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net income Net income Net Income (Loss) Attributable to Parent Long-Term Debt, Type Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location Location, Statement of Financial Position, Balance [Axis] Subcontractor Subcontractor [Member] Subcontractor. Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Loss contingency, estimate of possible loss Litigation Settlement, Amount Awarded to Other Party Schedule of Contract Assets and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]