Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted average number of shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Excise tax on share repurchases Excise Tax On Share Repurchases Excise Tax On Share Repurchases Title of 12(b) Security Title of 12(b) Security Subsequent Events Subsequent Event [Member] Net income — diluted Net Income (Loss) Available to Common Stockholders, Diluted Document Fiscal Year Focus Document Fiscal Year Focus Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Adjustment to Compensation, Amount Adjustment to Compensation Amount Forgivable Loans [Line Items] Forgivable Loans [Line Items] Forgivable Loans [Line Items] Segment Reporting [Abstract] Common stock, no par value; 25,000,000 shares authorized; 6,256,322 and 6,547,407 shares issued and outstanding, respectively Common Stock, Value, Issued Tax withholding payments reimbursed by shares Payment, Tax Withholding, Share-Based Payment Arrangement Interest expense, net Interest Expense, Operating and Nonoperating Compensation and related expenses Employee-related Liabilities, Current Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Forgivable Loans [Table] Forgivable Loans [Table] Forgivable Loans [Table] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Bad debt expense (recovery), net Accounts Receivable, Credit Loss Expense (Reversal) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of expenses are subject to reimbursement Schedule of Reimbursable Expenses Included in Revenues [Table Text Block] Tabular disclosure of reimbursable expenses included in revenues. Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Acquired identifiable intangible assets Intangible Asset, Finite-Lived, Acquired [Line Items] Forgivable loans Increase (Decrease) in Forgivable Loans The increase (decrease) during the reporting period of the amount of forgivable loans to employees and non employee experts. Total non-current liabilities Liabilities, Noncurrent Share-based compensation expense Stock Issued During Period Value Share Based Compensation Employees and Non Employees Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan to employees and non employees other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. 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 PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation adjustments, net of tax Foreign currency translation adjustment, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Basic (in shares) Weighted average shares outstanding — basic (in shares) Weighted Average Number of Shares Outstanding, Basic Accumulated goodwill impairment Accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Performance obligations satisfied in previous periods Contract with Customer, Performance Obligation Satisfied in Previous Period Customer relationships Customer Relationships [Member] Entity Address, City or Town Entity Address, City or Town Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Net Carrying Amount Intangible Asset, Finite-Lived, after Accumulated Amortization Reimbursable expenses Reimbursable Expenses Subject to Reimbursement Amount of reimbursable expenses, which include expenses for travel and other out-of-pocket expenses, outside consultants, and other reimbursable expenses. Revenues include reimbursable expenses. Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net income — basic Net Income (Loss) Available to Common Stockholders, Basic Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Aggregate credit facilities Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] United States UNITED STATES Forgivable loans, net of current portion Non-current portion of forgivable loans Forgivable Loans, Noncurrent Amounts due on long-term loans forgivable on the balance sheet date. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Restricted shares vesting (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recent Accounting Standards Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Schedule of segment reporting Segment Reporting [Table Text Block] Schedule of accrued expenses Schedule of Accrued Liabilities [Table Text Block] Repayments under revolving line of credit Repayments of Lines of Credit Effects of foreign currency translation Forgivable Loans, Translation Adjustments Amounts of increase (decrease) as a result of foreign currency translation on loans forgivable. Document Period End Date Document Period End Date Changes in operating assets and liabilities: 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 (shares) Preferred Stock, Shares Outstanding Unbilled services Increase (Decrease) in Contract with Customer, Asset Security Exchange Name Security Exchange Name Schedule of bad debt expense, net of recoveries Schedule Of Bad Debt Expense [Table Text Block] Table disclosure of bad debt expense. Beginning balance Ending balance Forgivable Loans. Represents information pertaining to forgivable loans provided as on the balance sheet date. Forgivable loan, term Forgivable Loan, Term Forgivable Loan, Term Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Current portion of lease liabilities Operating Lease, Liability, Current Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Net Income Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Unbilled services, net of allowances of $1,863 and $1,489, respectively Unbilled services, net Unbilled Contracts Receivable Net income per share: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Forgivable loans, interest rate (up to) Forgivable Loans, Interest Rate Forgivable Loans, Interest Rate Incentive cash awards payable Increase (Decrease) in Obligation, Incentive Cash Awards Amount of increase (decrease) in obligation for incentive cash awards. Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment 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] Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Advances Forgivable Loans, Advances Amounts of increase as a result of advances on loans forgivable. OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted (in shares) Weighted average shares outstanding — diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue 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] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Borrowings under revolving line of credit Proceeds from Lines of Credit Bad debt expense (recovery), net Contract with Customer, Receivable, Credit Loss Expense (Reversal) Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Amortization Forgivable loan amortization Forgivable Loans, Amortization Represents information pertaining to amortizations on forgivable loans during the period. Cash paid for amounts included in operating lease liabilities Operating Lease, Payments Award Timing Predetermined Award Timing Predetermined [Flag] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Effective tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Effect of dilutive stock options and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements All Executive Categories All Executive Categories [Member] Shares repurchased Stock Repurchased and Retired During Period, Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Deferred compensation and other non-current liabilities Deferred Compensation Liability, Classified, and Other Liabilities, Noncurrent Deferred Compensation Liability, Classified, and Other Liabilities, Noncurrent Right-of-use assets Operating Lease, Right-of-Use Asset Schedule of earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Maximum consolidated net leverage ratio Financial Covenants, Maximum Consolidated Net Leverage Ratio Financial Covenants, Maximum Consolidated Net Leverage Ratio Expiration Date Trading Arrangement Expiration Date Schedule of disaggregate CRA's revenue by type of contract and geographic location Disaggregation of Revenue [Table Text Block] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Effect of foreign exchange rates on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 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] Revenue recognized from: Revenue, Performance Obligation [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized (shares) Common Stock, Shares Authorized Useful Life (in years) Intangible Asset, Finite-Lived, Useful Life Minimum consolidated interest coverage Financial Covenants, Minimum Consolidated Interest Coverage Ratio Financial Covenants, Minimum Consolidated Interest Coverage Ratio Common stock, par value ( in dollars per share ) Common Stock, No Par Value Exercise Price Award Exercise Price INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Accrued dividends on unvested shares Dividends, Share-based Compensation, Net Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, net of adjustments. 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] Segments [Domain] Segments [Domain] Accrued Liabilities, Current [Abstract] Accrued Liabilities, Current [Abstract] Credit Agreement Debt Disclosure [Text Block] Accrued excise tax on shares repurchased Accrued Excise Tax On Shares Repurchased, Net Accrued Excise Tax On Shares Repurchased, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Direct project accruals Accrued Project Costs, Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for project costs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Term loan facility Secured Debt [Member] Adoption Date Trading Arrangement Adoption Date Contract liabilities: Contract with Customer, Liability [Abstract] Total shareholders’ equity Beginning balance Ending balance Equity, Attributable to Parent 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 Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Allowance for accounts receivable Accounts Receivable, Allowance for Credit Loss, Current 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) Selling, general and administrative expenses Selling, General and Administrative Expense Secured by letters of credit Letter of Credit [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Current portion of deferred compensation Deferred Compensation Liability, Current Antidilutive securities excluded from calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of business segment Number of Operating Segments Schedule of changes in the carrying amount of goodwill Goodwill [Table Text Block] Goodwill at December 30, 2023 Goodwill, gross Goodwill, Gross Entity Central Index Key Entity Central Index Key All Adjustments to Compensation All Adjustments to Compensation [Member] Adjustments and reconciling items Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] 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 used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Accounts payable, accrued expenses, and other liabilities Increase (Decrease) in Operating Liabilities Forgivable loans Current portion of forgivable loans Forgivable Loans, Current The current portion of forgivable loans to employees and non employee experts on the balance sheet date. Deferred income taxes Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Intangible Asset, Finite-Lived, Acquired [Table] Intangible Asset, Finite-Lived, Acquired [Table] City Area Code City Area Code Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Cash dividends and dividend equivalents paid Payments of Dividends Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Contract with Customer Contract Asset Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] Statement [Line Items] Statement [Line Items] Total assets Assets Non-current liabilities: Other Liabilities, Noncurrent [Abstract] Preferred stock, shares issued (shares) Preferred Stock, Shares Issued Operating Segments Operating Segments [Member] Amount available under revolving credit facility reduced Line of Credit Facility, Maximum Borrowing Capacity Reduced Reduction of maximum borrowing capacity under the credit facility. PEO PEO [Member] Accelerated amortization, involuntary termination Loans and Leases Receivable, Related Parties, Amortization, Involuntary Termination Loans and Leases Receivable, Related Parties, Amortization, Involuntary Termination Shares repurchased (in shares) Stock Repurchased and Retired During Period, Shares Goodwill, net Balance at the beginning of the period, Goodwill, net Balance at the end of the period, Goodwill, net Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Operating segment Operating Segment [Member] Operating Segment Amounts included in contract liabilities at the beginning of the period Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Non-current portion of lease liabilities Operating Lease, Liability, Noncurrent Revolving credit facility Revolving Credit Facility [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Shareholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Other Countries Other Than United States United Kingdom [Member] Represents information pertaining to countries other than United States and United Kingdom. Total Shareholder Return Amount Total Shareholder Return Amount Redemption of vested employee restricted shares for tax withholding Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Prepaid expenses and other current assets, and other assets Increase (Decrease) in Prepaid Expense and Other Assets Amortization Intangible Asset, Finite-Lived, Amortization Expense Adjustments to reconcile net income to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Revenues Consulting services revenues Revenue from Contract with Customer, Excluding Assessed Tax Revolving line of credit Borrowings outstanding Line of Credit, Current Number of broad areas of consulting services Number of Broad Areas of Consulting Services Number of broad areas in consulting services offered by the reporting entity. Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Intangible Asset, Finite-Lived, Class [Axis] 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 and Allowances Revenue from Contract with Customer [Text Block] Schedule of forgivable loan activity Schedule Of Forgivable Loans Activity [Table Text Block] Tabular disclosure of the forgivable loans activity. Segment Reporting [Table] Segment Reporting [Table] 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 Operating Income (Loss) Client reimbursable expenses Client Reimbursable Expenses Client Reimbursable Expenses Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount 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] Cash dividends paid to shareholders (in dollars per share) Common share quarterly cash dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared 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 (shares) Common Stock, Shares, Issued Measure: Measure [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Forgivable loan activity Forgivable Loan Activity [Roll Forward] Forgivable Loan Activity Schedule of components of acquired identifiable intangible assets Intangible Asset, Finite-Lived, Acquired [Table Text Block] Costs of services (exclusive of depreciation and amortization) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Cash paid for taxes 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 Redemption of vested employee restricted shares for tax withholding (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Subsequent Events [Abstract] Subsequent Events [Abstract] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other Assets, Noncurrent Document Type Document Type Accrued expenses Total accrued expenses Accrued Liabilities, Current Fixed-price Fixed-Price Contract [Member] Fair Value as of Grant Date Award Grant Date Fair Value Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Events Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income before provision for 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 (Note 9) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Decrease in accounts payable and accrued expenses for property and equipment 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] Forgivable Loans Forgivable Loans No definition available. Changes in the carrying amount of goodwill Goodwill [Roll Forward] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Other segment expense Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Other 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] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Employee compensation and fringe benefit costs Labor and Related Expense Cash dividends paid (per share) Dividends, Cash Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Repayments Forgivable Loans Repayments Amounts of decrease as a result of repayment of forgivable loan. Contract liabilities Contract with Customer, Liability, Current Forgivable Loans Forgivable Loans Disclosure [Text Block] Represents information pertaining to disclosure of forgivable loans. Repurchase of common stock Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowances of $6,262 and $6,664, respectively Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) 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] Performance awards Allocated Share-based Compensation Expense, Current, Accelerated Vesting of Awards Allocated Share-based Compensation Expense, Current, Accelerated Vesting of Awards Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] United Kingdom UNITED KINGDOM Foreign currency translation adjustment Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and shareholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Tabular List, Table Tabular List [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Shareholders’ equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] 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 (shares) Preferred Stock, Shares Authorized Deferred revenue and other liabilities Deferred Credits and Other Liabilities, Current Preferred stock, no par value; 1,000,000 shares authorized; none issued and outstanding Preferred Stock, Value, Issued Accrued bonuses Accrued Bonuses, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Less: net income attributable to participating shares Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Senior Loan Agreement Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Goodwill, impairment loss Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Right-of-use asset amortization Right of Use Asset Amortization Amount of right-of-use asset amortization. Credit Agreement Credit Agreement [Member] Credit Agreement Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Intangible assets impairment losses Intangible Asset, Finite-Lived, Impairment Loss Right-of-use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Provision for income taxes Income Tax Expense (Benefit) Foreign currency gains (losses), net Gain (Loss), Foreign Currency Transaction, before Tax Award Timing Method Award Timing Method [Text Block] Net increase (decrease) 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] Time-and-materials Time-and-Materials Contract [Member] Lease liabilities Increase Decrease in Lease Liabilities The increase (decrease) during the reporting period in the aggregate amount of lease liabilities that result from activities that generate operating income. Net income Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Allowance for unbilled services Allowance For Unbilled Services Represents the valuation allowance for unbilled service receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Schedule of opening and closing balances and result of changes in contract liability balance Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Reclassifications from accrued expenses or to other assets Forgivable Loans Reclassification From Accrued Expenses To Other Assets Amounts of decrease as a result of reclassification from accrued expenses and reclassification to other assets. Unrealized foreign currency remeasurement (gains) losses, net Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Noncash investing and financing activities: Other Noncash Investing and Financing Items [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]