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Adjustment Restatement [Table] Current Fiscal Year End Date Current Fiscal Year End Date 2015 Share repurchase program 2015 Share Repurchase Program [Member] 2015 Share Repurchase Program Capitalization of internally developed software costs Payments to Develop Software Accounts payable Accounts Payable, Current Accrued expenses and other current liabilities Accrued Liabilities, Current Document Fiscal Period Focus Document Fiscal Period Focus Unrealized loss on investment, net of tax Unrealized gain on investment, net of taxes Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Common stock, shares issued (shares) Common Stock, Shares, Issued Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Payments Payments for Restructuring Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Amortization of intangible assets and software development costs Cost, Depreciation and Amortization Shares redeemed for employee tax withholdings Payment, Tax Withholding, Share-based Payment Arrangement Direct costs and reimbursable expenses (exclusive of depreciation and amortization shown in operating expenses): Direct Operating Costs [Abstract] Senior secured credit facility Senior Secured Credit Facility [Member] Senior Secured Credit Facility [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Schedule of Restructuring Reserve by Type of Cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Actual consolidated leverage ratio Debt Instrument, Covenant, Actual Consolidated Leverage Ratio Debt Instrument, Covenant, Actual Consolidated Leverage Ratio Entity Filer Category Entity Filer Category Employee Type [Axis] Employee Type [Axis] Employee Type [Axis] (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Aircraft Security Agreement Aircraft Security Agreement [Member] Aircraft Security Agreement Non-cash lease expense Noncash Operating Lease Expense Portion of straight-line operating lease expense allocated to the amortization of the operating lease right of use assets. Number of employees hired (in employees) Number Of Employees Hired Number Of Employees Hired Summary of Carrying Amounts of Debt Schedule of Long-term Debt Instruments [Table Text Block] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] 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] Increase (decrease) in contract asset Increase (Decrease) in Contract with Customer, Asset Restatement [Axis] Restatement [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Common stock Common Stock, Value, Issued Deferred income taxes Deferred Income Taxes and Tax Credits Fair Value Interest Rate Swaps Designated as Cash Flow Hedging Instruments Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] 2021 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year Non-competition agreements Noncompete Agreements [Member] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Cash and cash equivalents Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Cash and Cash Equivalents, at Carrying Value Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Fixed-fee Fixed-price Contract [Member] Basic (shares) Weighted average common shares outstanding - basic (shares) Weighted Average Number of Shares Outstanding, Basic Operating lease right-of-use assets Operating Lease, Right-of-Use Asset AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Equity Components [Axis] Equity Components [Axis] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Total stockholders’ equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Amortization expense Amortization of Intangible Assets Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Local Phone Number Local Phone Number Underlying Asset Class [Domain] Underlying Asset Class [Domain] Deferred revenues Contract with Customer, Liability, Current Performance-based Performance-based [Member] Performance-based [Member] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Technology and software Technology-Based Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Entity Address, Address Line One Entity Address, Address Line One Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Entity Emerging Growth Company Entity Emerging Growth Company Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Depreciation and amortization Depreciation, Depletion and Amortization Gross Carrying Amount Finite-Lived Intangible Assets, Gross Business Advisory Business Advisory [Member] Business Advisory [Member] Variable Rate [Axis] Variable Rate [Axis] Reclassification adjustments into earnings, tax (expense) benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Antidilutive securities (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Additional paid-in capital Additional Paid in Capital, Common Stock Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Equity Component [Domain] Equity Component [Domain] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Option to increase revolving credit facility Optional Increase In Revolver Optional increase in revolver. Increase (decrease) in performance obligation Increase (Decrease) in Contract with Customer, Liability (Increase) decrease in current income tax receivable / payable, net Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Trading Symbol Trading Symbol Share repurchase authorized amount Stock Repurchase Program, Authorized Amount Goodwill impairment charges Goodwill, Impairment Loss Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Components of Segment Information Segment Reporting Information, Profit (Loss) [Abstract] Accelerated Share Repurchases [Line Items] Accelerated Share Repurchases [Line Items] Entity Shell Company Entity Shell Company Education Education [Member] Education [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Goodwill Goodwill, Gross