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[Member] Revolving credit facility Line of Credit Facility, Current Borrowing Capacity Actual consolidated leverage ratio Debt Instrument, Covenant, Actual Consolidated Leverage Ratio Debt Instrument, Covenant, Actual Consolidated Leverage Ratio Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Employee Type [Axis] Employee Type [Axis] Employee Type [Axis] Goodwill Goodwill, Gross Change in fair value, tax (expense) benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Long-term debt, net of current portion Long-term Debt, Excluding Current Maturities Liabilities: Liabilities, Fair Value Disclosure [Abstract] Aircraft Security Agreement Aircraft Security Agreement [Member] Aircraft Security Agreement Schedule of Goodwill [Table] Schedule of Goodwill [Table] 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. Convertible debt investment Convertible Debt Securities [Member] Convertible Debt Securities [Member] Net earnings (loss) per basic share: Earnings Per Share, Basic and Diluted [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Beginning balance (shares) Ending balance (shares) Shares, Issued Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Discount rate Measurement Input, Discount Rate [Member] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Interest expense, net of interest income Interest Income (Expense), Nonoperating, Net Intangible assets Finite-Lived Intangible Assets, Net [Abstract] Entity Central Index Key Entity Central Index Key LIBOR London Interbank Offered Rate (LIBOR) [Member] Security Exchange Name Security Exchange Name Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Loss from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Underlying Asset Class [Domain] Underlying Asset Class [Domain] Exercise of stock options (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Diluted (shares) Weighted average common shares outstanding - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Fair value, measurements, recurring Fair Value, Recurring [Member] Income Taxes Income Tax Disclosure [Text Block] Related Party [Domain] Related Party [Domain] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Revenue recognized at a point in time Transferred at Point in Time [Member] Interest rate on borrowings Debt Instrument, Basis Spread on Variable Rate Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Five Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other income (expense), net: Nonoperating Income (Expense) [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Changes in operating assets and liabilities, net of acquisition and divestiture: Increase (Decrease) in Operating Capital [Abstract] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Total current liabilities Liabilities, Current Shares redeemed for employee tax withholdings Payment, Tax Withholding, Share-based Payment Arrangement Performance-based Performance-based [Member] Performance-based [Member] Reclassification adjustments into earnings, tax (expense) benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Maximum principle amount Line of Credit Facility, Maximum Borrowing Capacity Revenues Revenue from Contract with Customer, Including Assessed Tax Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Equity Securities without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Policy Text Block] Business Advisory Business Advisory [Member] Business Advisory [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Direct costs Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Statistical Measurement [Axis] Statistical Measurement [Axis] Investment in life insurance policies Payments for (Proceeds from) Life Insurance Policies (Increase) decrease in unbilled services, net Increase (Decrease) in Other Receivables Cover [Abstract] Option to increase revolving credit facility Optional Increase In Revolver Optional increase in revolver. Preferred Stock Preferred Stock [Member] Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Goodwill Goodwill, net beginning balance Goodwill, net ending balance Goodwill Reclassification adjustments into earnings, before taxes Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Price volatility Measurement Input, Price Volatility [Member] Change in fair value of contingent consideration for business acquisition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Description of Business Nature of Operations [Text Block] Adjustments to reconcile net income (loss) to cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Education Education [Member] Education [Member] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table]