Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Professional Search & Interim Professional Search Interim [Member] Professional search & interim. Fee revenue, percentage Revenue From Contract With Customer Excluding Assessed Tax Percentage Revenue from contract with customer excluding assessed tax percentage. Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Schedule of Benefit Payments, Expected To Be Paid Schedule of Expected Benefit Payments [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Additional deferred units to acquire Period To Acquire Additional Deferred Units The number of years that the participants were able to acquire additional "deferral units" under the plan. Entity File Number Entity File Number Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Tabular List, Table Tabular List [Table Text Block] Target allocation range Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Recently Adopted Accounting Standards and Recent Accounting Standards - Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Goodwill [Line Items] Goodwill [Line Items] Authorized payroll deductions, value Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Value For E S P P The maximum value that an employee can purchase of shares through the ESPP in an annual period. Other segment items Other Expenses Adjustment to Compensation: Adjustment to Compensation [Axis] Integration/acquisition costs Business Combination Acquisition And Integration Related Costs This element represents integration and acquisition-related costs incurred to effect a business combination and integrate it into the business which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Fee Revenue Revenue from Contract with Customer [Text Block] North America Executive Search, North America [Member] Executive Search, North America Hay Group Hay Group [Member] Hay Group[Member] Employees stock purchased (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Current provision for income taxes Current Income Tax Expense (Benefit) Adjustment to Compensation, Amount Adjustment to Compensation Amount Less: Unamortized discount and issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Pension Plans, Defined Benefit Pension Plan [Member] Basis of Consolidation and Presentation Consolidation, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Schedule Of Intangible Assets [Table] Schedule Of Intangible Assets [Table] Schedule of Intangible Assets [Table] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Credit loss for available for sales debt securities Provision For Credit Losses On Available For Sale Debt Securities Provision For Credit Losses On Available For Sale Debt Securities Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Healthcare care cost trend rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Antidilutive Securities Antidilutive Securities [Axis] Amortization of employer contributions Deferred Compensation Amortization Of Employer Contribution Deferred Compensation Amortization Of Employer Contribution Dividends paid to shareholders Dividends, Common Stock, Cash Total Korn Ferry stockholders' equity Equity, Attributable to Parent Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Issuance of stock (in shares) Stock Issued During Period, Shares, New Issues Unvested obligations under deferred compensation plans Deferred Compensation Plans Unvested Obligations The amount of the liability included in the deferred compensation plans that is unvested and therefore the participants have not earned the right to. Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] State and Local Jurisdiction State and Local Jurisdiction [Member] Cover [Abstract] Cover [Abstract] Cash and money market funds, fair value Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] Intangible assets estimated useful lives Finite-Lived Intangible Asset, Useful Life Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used by Type [Axis] Net income attributable to noncontrolling interest Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Unrecognized tax benefits, interest on income taxes accrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Net Finite-Lived Intangible Assets, Net Restricted stock Restricted Stock [Member] Number of solutions Number of Solutions The number of solutions offered by the Company. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Consulting Consulting [Member] Consulting. Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Credit Facilities Credit Facilities [Member] Credit facilities. Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Digital Digital [Member] Digital. Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Income taxes and other receivables Income Taxes And Other Receivables, Current Income Taxes And Other Receivables, Current Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Cash Paid, Net of Refunds Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Less: comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Restructuring liability Restructuring liability, beginning balance Restructuring liability, ending balance Restructuring Reserve Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Operating lease liability, current Operating Lease, Liability, Current Non-taxable or non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract] Interest on lease liabilities Finance Lease, Interest Expense Software and Software Development Costs Software and Software Development Costs [Member] Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Furniture and fixtures Furniture and Fixtures [Member] Award Type Award Type [Axis] Foreign currency translation adjustments Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Other Financial Institutions Other Financial Institutions [Member] Other Financial Institutions [Member] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Business Acquisitions Business Combination [Policy Text Block] Income Taxes & Other Receivables Income Taxes And Other Receivables Including Foreign Currency Forward Contracts Income Taxes And Other Receivables Including Foreign Currency Forward Contracts Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Entity Address, City or Town Entity Address, City or Town Finance leases Finance Lease, Weighted Average Discount Rate, Percent Gain on marketable securities Marketable Security, Gain (Loss) Education/Non–Profit/General Education Non Profit And General [Member] Education, non-profit and general. Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance Statement of Income Location, Balance [Domain] Allowance for Doubtful Accounts Credit Loss, Financial Instrument [Policy Text Block] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Settlement with tax authority Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Entity Emerging Growth Company Entity Emerging Growth Company Finance leases Finance Lease, Weighted Average Remaining Lease Term Number of foreign jurisdictions Number Of Foreign Jurisdictions Number of foreign jurisdictions. 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] Unamortized debt issuance costs Debt Issuance Costs, Net Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Debt instrument, proceeds from offering used to repay outstanding debt Debt Instrument Proceeds From Offering Used To Repay Outstanding Debt Debt instrument, proceeds from offering used to repay outstanding debt. 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year One Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Provision for doubtful accounts Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Schedule of Disaggregation of Fee Revenue by Industry Disaggregation of Revenue [Table Text Block] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] Current income taxes: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred tax assets, valuation allowance increase (decrease) Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Income taxes payable Accrued Income Taxes, Current 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] Schedule of Long-Lived Assets, Excluding Financial Instruments and Tax Assets Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Schedule of Estimated Annual Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Change in benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Prepaid expenses and other assets Prepaid Expense and Other Assets, Current Interest rate, effective percentage Debt Instrument, Interest Rate, Effective Percentage Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax provision Total provision for income taxes Income Tax Expense (Benefit) Applicable margin on variable interest rate Debt Instrument, Basis Spread on Variable Rate Administrative expenses paid Defined Benefit Plan Benefit Obligation Administrative Expenses Paid Defined Benefit Plan Benefit Obligation Administrative Expenses Paid Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Property and equipment, gross Property, Plant and Equipment, Gross Company's matching contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Restructuring Charges, Net Restructuring and Related Activities Disclosure [Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Additions Goodwill, Acquired During Period Cash paid for acquisitions, net of cash acquired Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired U.S. Federal Income Tax Paid, Federal, after Refund Received 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] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Obligations for which assets are held in trust Other Deferred Compensation Arrangements, Liability, Current and Noncurrent Common stock available for stock-based awards (in shares) Common Stock Increases In Capital Shares Reserved For Future Issuance Common stock increases in capital shares reserved for future issuance. Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Debt instrument term Debt Instrument, Term Marketable securities remaining maturity Marketable Securities Remaining Maturity Marketable securities remaining maturity. Property and equipment estimated useful life Property, Plant and Equipment, Useful Life Subsequent Event Subsequent Event [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type Long-Term Debt, Type [Axis] Depreciation expense for property and equipment Depreciation Foreign Income Tax Paid, Foreign, after Refund Received [Abstract] Money market funds Money Market Funds [Member] 2030 Finance Lease, Liability, to be Paid, Year Four Equity Components Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Sublease income Sublease Income Standby Letters of Credit Standby Letters of Credit [Member] Technology Technology Service [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of business segments Number of Reportable Segments Enhanced Wealth Accumulation Plan Enhanced Wealth Accumulation Plan [Member] Enhanced Wealth Accumulation Plan [Member] Advertising Costs Advertising Cost [Policy Text Block] Entity Address, State or Province Entity Address, State or Province Principal payments on finance leases Financing cash flows from finance leases Finance Lease, Principal Payments Stock-based compensation APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition Impairment of right-of-use assets Lease impairment cost Operating Lease, Impairment Loss Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Total current liabilities Liabilities, Current Number of performance obligations Number Of Performance Obligations, Standard Search Engagement Number Of Performance Obligations, Standard Search Engagement Individual: Individual [Axis] Financial Services Financial Service [Member] Income taxes and other receivables Increase (Decrease) in Other Receivables Income Tax Jurisdiction Income Tax Jurisdiction [Domain] Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Dividends paid to shareholders Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Percentage of noncontrolling interest in subsidiary Subsidiary, Ownership Percentage, Noncontrolling Owner Entity Interactive Data Current Entity Interactive Data Current Unearned compensation Increase Decrease In Unearned Compensation Increase Decrease In unearned compensation. Mutual funds Mutual Fund [Member] Deferred revenue Deferred Tax Assets, Deferred Income Funded status and balance, end of year Defined Benefit Plan, Funded (Unfunded) Status of Plan Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Credit Losses Allowance for Credit Losses [Text Block] Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Ownership Ownership [Domain] Marketable securities, non-current Marketable Securities, Non-current Marketable Securities, Noncurrent Annual benefit payments per vested unit after anniversary period, option three Defined Benefit Plan Payment Award, Employee Subscription Value, Option Three Defined Benefit Plan Payment Award, Employee Subscription Value, Option Three Audit Information [Abstract] Audit Information 2028 Finance Lease, Liability, to be Paid, Year Two 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Restructuring Charges, Net Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Deferred income taxes: Deferred Income Taxes and Other Assets [Abstract] Schedule Of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Financial Instruments Financial Instruments Disclosure [Text Block] Non-taxable or non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount [Abstract] Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] Fair value and unrealized losses on available for sale debt securities. Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Cash Surrender Value of Life Insurance Cash Surrender Value Of Life Insurance Policy [Policy Text Block] Cash Surrender Value of Life Insurance. Benefits paid from cash Benefits paid Employee distributions Defined Benefit Plan, Benefit Obligation, Benefits Paid U.S. federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type Subsequent Event Type [Axis] Other Other Securities [Member] Other securities [Member] Long-term debt Long-term borrowings, net of unamortized discount and debt issuance costs Long-Term Debt, Excluding Current Maturities 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Statement of Financial Position Location, Balance Statement of Financial Position Location, Balance [Axis] Gross Finite-Lived Intangible Assets, Gross 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] Property and equipment, at cost Finance Leases Property And Equipment At Cost Finance leases property and equipment at cost. Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Finance lease cost Finance Lease Costs Finance lease costs. Accumulated Other Comprehensive Loss, Net Accumulated other comprehensive loss, net Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Investments Investments [Domain] Shares repurchased during the period to pay for taxes (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Ownership Ownership [Axis] Net prior service credit amortization Net prior service credit amortization Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Schedule of Supplemental Cash Flow Information Related to Leases Schedule Of Cash Flow Information Related To Leases [Table Text Block] Schedule of cash flow information related to leases. Fair Value as of Grant Date Award Grant Date Fair Value Marketable Securities, Non-Current Marketable Securities Non Current [Member] Marketable securities non-current member. Net operating loss carryforward Operating Loss Carryforwards Change in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Schedule of Long-Term Debt, at Amortized Cost Schedule of Long-Term Debt Instruments [Table Text Block] Compensation and benefits Labor and Related Expense Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Total operating expenses Costs and Expenses Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Total unrecognized compensation cost related to non-vested awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Credit Agreement Credit Agreement [Member] Credit Agreement [Member] Segment Adjusted EBITDA Earnings Before Interest Tax Depreciation And Amortization Earnings Before Interest Tax Depreciation And Amortization Less than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Senior Unsecured Notes Senior Unsecured Notes [Member] Senior unsecured notes. Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Schedule of Supplemental Balance Sheet Information Related to Leases Schedule Of Balance Sheet Information Related To Leases [Table Text Block] Schedule of balance sheet information related to leases. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Investment Type Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Schedule of Reconciliation of Benefit Obligation Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Non-PEO NEO Non-PEO NEO [Member] Long-term debt arrangement Letters of Credit Outstanding, Amount Operating lease, right-of-use, assets Deferred Tax Liabilities, Leasing Arrangements Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Organization And Summary Of Significant Accounting Policies [Table] Organization And Summary Of Significant Accounting Policies [Table] Organization And Summary Of Significant Accounting Policies [Table] Sale of Stock Sale of Stock [Axis] Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Award Type Award Type [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Noncontrolling interest Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Advertising costs Advertising Expense Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Canada CANADA Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Contract liabilities, revenue recognized Contract with Customer, Liability, Revenue Recognized Retirement Plan Type Retirement Plan Type [Domain] Schedule of Activity in Allowance for Credit Losses on Trade Receivables Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Foreign tax rates differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Australia AUSTRALIA ESPP Employee Stock [Member] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] RPO R P O [Member] RPO. Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Repatriation of earnings of foreign subsidiaries Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent Financial Instruments Financial Instruments [Domain] Participant after tax contribution period towards deferred compensation plans Participant After Tax Contribution Period Towards Deferred Compensation Plans Number of years the participant will receive payments from the plan once the participant meets the requirements under the plan. Gross deferred tax liabilities Deferred Tax Liabilities, Gross Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Income Tax Authority, Name Income Tax Authority, Name [Domain] Market Based Restricted Stock Market Based Restricted Stock [Member] Market Based Restricted Stock [Member] Company Selected Measure Name Company Selected Measure Name United Arab Emirates UNITED ARAB EMIRATES Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Secured Financing Overnight Rate Secured Financing Overnight Rate [Member] Secured financing overnight rate. Accounts payable Accounts Payable, Current Operating cash flows from operating leases Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Diluted net earnings attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Foreign Current Foreign Tax Expense (Benefit) Goodwill [Roll Forward] Goodwill [Roll Forward] Restructuring Plan Restructuring Plan [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Diluted (in shares) Diluted weighted-average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Nature of Business Segment Reporting, Policy [Policy Text Block] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Cash compensation, percentage Cash Compensation, Percentage Cash Compensation, Percentage Number of revenue recognition phases Number Of Revenue Phases Number Of Revenue Phases Proceeds from life insurance policies Proceeds from Life Insurance Policy Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Schedule of Reconciliation of Benefit Obligation and Changes in ECAP Liability Schedule of Changes in Projected Benefit Obligations [Table Text Block] Proprietary databases Database Rights [Member] State Current State and Local Tax Expense (Benefit) Long-Term Debt Long-Term Debt [Text Block] Document Transition Report Document Transition Report Total lease payments Finance Lease, Liability, to be Paid Underlying Securities Award Underlying Securities Amount Equity Component Equity Component [Domain] Document Period End Date Document Period End Date Income Taxes Income Tax Disclosure [Text Block] Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss United Kingdom United Kingdom UNITED KINGDOM Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Debt securities Defined Benefit Plan, Debt Security [Member] Short-term lease cost Short-Term Lease, Cost Total stockholders' equity Beginning balance Ending balance Accumulated other comprehensive loss, net Equity, Including Portion Attributable to Noncontrolling Interest Reserves and accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Cash surrender value of life insurance subject to credit risk, percentage Cash Surrender Value Of Life Insurance Subject To Credit Risk, Percentage Cash Surrender Value Of Life Insurance Subject To Credit Risk, Percentage Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Basic and Diluted Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Schedule of Components of Net Periodic Benefits Costs Schedule of Defined Benefit Plans Disclosures [Table Text Block] Product and Service Product and Service [Axis] Variable lease cost Variable Lease, Cost Total revenue Fee revenue Total fee revenue Revenue from Contract with Customer, Excluding Assessed Tax Total current assets Assets, Current Weighted average remaining lease terms: Weighted Average Remaining Lease Term [Abstract] Weighted average remaining lease term. Intangible asset additions Intangible assets Finite-Lived Intangible Assets Acquired Statistical Measurement Statistical Measurement [Axis] Quarterly commitment fee on average daily unused amount of credit facilities Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Payments of tax withholdings on restricted stock Payments of tax withholdings on restricted stock Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Basic net earnings attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Marketable securities Marketable Securities, Current Marketable Securities, Current Annual benefit payments per vested unit after anniversary period, option one Defined Benefit Plan Payment Award, Employee Subscription Value, Option One Defined Benefit Plan Payment Award, Employee Subscription Value, Option One Gross CSV Cash Surrender Value Of Life Insurance Gross Cash Surrender Value of Life Insurance Gross Level 1 Fair Value, Inputs, Level 1 [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Receivables due from clients, net of allowance for doubtful accounts of $42,527 and $40,461 at April 30, 2026 and 2025, respectively Accounts Receivable, after Allowance for Credit Loss, Current AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Schedule of Weighted-Average Assumptions Used in Calculating Benefit Obligations Defined Benefit Plan, Assumptions [Table Text Block] State Income Tax Paid, State and Local, after Refund Received Consolidation Items Consolidation Items [Domain] Trilogy International (Trilogy) Trilogy International (Trilogy) [Member] Trilogy International (Trilogy) Auditor Location Auditor Location Benefit plan, number of participants Defined Benefit Plan Number Of Plan Participants Defined benefit plan number of plan participants. Marketable Securities, Current Debt Securities, Available-for-Sale, Current Latin America Executive Search, Latin America [Member] Executive Search, Latin America Actuarial loss Actuarial (gain) loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Finance lease cost Finance Lease Costs [Abstract] Finance lease costs. Participants' contributions Employee contributions Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Cash used to pay income taxes, net of refunds Total Income Taxes Paid, Net Corporate notes/bonds Corporate Bond Securities [Member] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Borrowings outstanding Senior Unsecured Notes Long-Term Debt, Gross Foreign currency translation Allowance For Doubtful Accounts, Foreign Currency Translation, Increase (Decrease) Allowance for doubtful accounts foreign currency translation. Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Compensation and benefits payable Employee-related Liabilities, Current Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Total lease payments Lessee, Operating Lease, Liability, to be Paid Participant contribution period towards deferred compensation plans Participant Contribution Period Towards Deferred Compensation Plans The number of years that the participant is required to contribute into the plan. Non-deductible officer's compensation Effective Income Tax Rate Reconciliation, Non-Deductible Officer's Compensation, Percent Effective Income Tax Rate Reconciliation, Non-Deductible Officer's Compensation, Percent Dividends paid to noncontrolling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Trade Names Trade Names [Member] Schedule of Fair Value and Unrealized Losses on Available for Sale Debt Securities Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Reimbursed out-of-pocket engagement expenses Reimbursed Out Of Pocket Engagement Expenses [Member] Reimbursed out-of-pocket engagement expenses. 2031 Finite-Lived Intangible Asset, Expected Amortization, Year Five Stockholders' equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Net unrealized (loss) gain on marketable securities, net of tax Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Performance-related bonus expenses Performance Related Bonus Expenses Performance related bonus expenses. 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All Executive Categories All Executive Categories [Member] Schedule of Components of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Marketable Securities, Current Marketable Securities Current [Member] Marketable securities current. Property and equipment, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Add: undistributed earnings to nonvested restricted stockholders Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Commitments and contingencies Commitments and Contingencies 4.625% Senior Unsecured Notes due 2027 Four Point Six Two Five Percent Senior Unsecured Notes Due Two Thousand Twenty Seven [Member] Four point six two five percent senior unsecured notes due two thousand twenty seven. Business Combination Business Combination [Axis] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Fee Revenue Classified by Country Revenue from External Customers by Geographic Areas [Table Text Block] Salo LLC ("Salo") Salo LLC [Member] Salo LLC Noncontrolling Interest Noncontrolling Interest [Member] Accumulated depreciation Finance Leases Accumulated Depreciation Finance leases accumulated depreciation. Net deferred tax asset Deferred Tax Assets, Net PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Total Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Administrative expenses paid Defined Benefit Plan Assets Administrative Expenses Paid Defined Benefit Plan Assets Administrative Expenses Paid Debt instrument, fair value Debt Instrument, Fair Value Disclosure Scenario [Axis] Scenario [Axis] Schedule of Changes in Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] PIVOT Leadership Pivot Leadership [Member] Pivot Leadership Deferred compensation and pension plan adjustments, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 2031 Defined Benefit Plan, Expected Future Benefit Payment, Year Five All Individuals All Individuals [Member] Long-term Debt, Type Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Annual benefit payments per vested unit after anniversary period, option two Defined Benefit Plan Payment Award, Employee Subscription Value, Option Two The annual payments that will be made for five years commencing on the seventh anniversary of the grant date. Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Life Sciences/Healthcare Life Sciences And Healthcare [Member] Life Sciences/Healthcare. 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] Proceeds from issuance of common stock in connection with an employee stock purchase plan Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Exchange rate fluctuations Goodwill, Foreign Currency Translation, Gain (Loss) Fair market price of common stock Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Business Combination, Goodwill, Reportable Segment Assignment [Table] Business Combination, Goodwill, Reportable Segment Assignment [Table] Equity securities Defined Benefit Plan, Equity Securities [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Available-for-sale, term Debt Securities, Available-for-Sale, Term Geographical Geographical [Axis] Corporate notes/bonds Corporate Notes Or Bonds [Member] Corporate Notes Or Bonds. Lessee Lease Description [Line Items] Lessee, Lease, Description [Line Items] Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Foreign currency losses Gain (Loss), Foreign Currency Transaction, before Tax Forecast Forecast [Member] Less: distributed and undistributed earnings to nonvested restricted stockholders Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Lessee Lease Description [Table] Lessee, Lease, Description [Table] Earnings per common share attributable to Korn Ferry: Earnings Per Share [Abstract] 2031 Lessee, Operating Lease, Liability, to be Paid, Year Five Non-compete agreements Noncompete Agreements [Member] Restructuring Plan Restructuring Plan [Axis] Unrecognized tax benefits, income tax penalties accrued Unrecognized Tax Benefits, Income Tax Penalties Accrued Other income, net Nonoperating Income (Expense) Dividends received from unconsolidated subsidiaries Proceeds from Equity Method Investment, Distribution, Return of Capital Foreign-derived intangible income deduction Effective Income Tax Rate Reconciliation, FDII, Percent Long Term Performance Unit Plan Long Term Performance Unit Plan [Member] Information by type of deferred compensation that is not equivalent to a defined benefit pension plan or a defined benefit other postretirement benefit plan. Includes, but is not limited to, employment contracts with one or more selected officers or key employees. Excludes equity-based compensation plans, defined benefit pension plans and defined benefit other postretirement benefit plans. => Long term performance unit plan. Percentage that actuarial gain or loss must exceed the greater of PBO or market value plan assets Corridor Rule Percentage The percentage that the actuarial gain or loss must exceed the greater of the PBO or Market Related Value of Plan Assets in order to amortize the amount through pension cost. Foreign Currency Forward Contracts Not Designated as Hedges Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block] Company's contributions, unamortized portion Deferred Compensation Arrangement With Individual Employer Contribution Unamortized Portion The amount of Company contributions that is unamortized but will be expensed in future period once the conditions are met. Medical and Life Insurance plan Medical And Life Insurance Plan [Member] Medical and life insurance plan. Cash surrender value of company-owned life insurance policies, net of loans Net CSV Cash Surrender Value of Life Insurance Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Purchase of stock (in shares) Shares repurchased during the period (in shares) Treasury Stock, Shares, Acquired Thereafter Finance Lease, Liability, to be Paid, after Year Five Operating lease liability Deferred Tax Assets Operating Lease Liability Deferred tax assets operating lease liability. Award Timing Disclosures [Line Items] Less: reallocation of undistributed earnings to nonvested restricted stockholders Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted Service cost Defined Benefit Plan, Service Cost Exchange rate fluctuations Restructuring Reserve, Foreign Currency Translation Gain (Loss) Recoveries of amounts previously written off Accounts Receivable, Allowance for Credit Loss, Recovery Unrealized gains (losses) arising during the period Other Comprehensive Income (Loss), before Reclassifications, Net of Tax The "Plan" The "Plan" [Member] The "Plan" State Deferred State and Local Income Tax Expense (Benefit) Net income attributable to Korn Ferry Net income attributable to Korn Ferry Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Other accrued liabilities Other Accrued Liabilities, Current Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Mexican Subsidiary Mexican Subsidiary [Member] Mexican subsidiary. Repurchases of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Base Rate Loans Base Rate [Member] Performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Performance Period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Performance Period Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Contract assets-unbilled receivables Contract with Customer, Asset, after Allowance for Credit Loss Lessee operating lease, term of contract Lessee, Operating Lease, Term of Contract Intangibles and goodwill Deferred Tax Liabilities, Goodwill and Intangible Assets Customer Relationships Customer Relationships [Member] Operating income Operating Income (Loss) Compensation and Benefits Expense Compensation Related Costs, Policy [Policy Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Schedule of Components Of Stock-Based Compensation Expense Recognized Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Other countries Other Countries [Member] Other Countries [Member] 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] Gain on cash surrender value of life insurance policies Increase in market value of the underlying COLI investments Life Insurance, Corporate or Bank Owned, Change in Value Percentage contribution by the participants to defined contribution plan Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Subsequent Event Type Subsequent Event Type [Domain] Total death benefits payable, net of loans Death Benefits Payable Net Of Loans Death Benefits Payable Net Of Loans Impairment of intangible assets Impairment of Intangible Assets, Finite-Lived 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] Other Deferred Tax Liabilities, Other Retirement Plan Type Retirement Plan Type [Axis] Statement [Table] Statement [Table] Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Deferred compensation Increase (Decrease) in Deferred Compensation Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Deferred income taxes Deferred benefit for income taxes Deferred Income Tax Expense (Benefit) 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] Lapse of applicable statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash paid for amounts included in the measurement of lease liabilities: Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Cash paid for amounts included in measurement of lease liabilities. Other foreign Foreign Tax Jurisdiction, Other [Member] Loss carryforwards Deferred Tax Assets, Other Loss Carryforwards Variable Rate Variable Rate [Domain] Contract liabilities-deferred revenue Contract with Customer, Liability Other liabilities Finance Lease, Liability, Noncurrent All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag Maximum number of shares reserved for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Schedule of Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Fair Value Measurements of Defined Benefit Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Basic (in shares) Basic weighted-average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule of Basic and Diluted Earnings per Common Share Attributable to Common Stockholders Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Defined Benefit Plan, Plan Assets, Category Defined Benefit Plan, Plan Assets, Category [Axis] Scenario [Domain] Scenario [Domain] Income Tax Authority, Name Income Tax Authority, Name [Axis] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Debt instrument, unamortized discount Debt Instrument, Unamortized Discount Recognized tax expense related to interest and penalties Unrecognized Tax Benefits, Interest on Income Taxes Expense Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Fair Value And Unrealized Losses On Available For Sale Debt Securities [Table] Fair Value And Unrealized Losses On Available For Sale Debt Securities [Table] Fair value and unrealized losses on available for sale debt securities. 2032-2036 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Deferred Compensation Plan Deferred Compensation Plan [Member] Deferred Compensation Plan [Member] Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount Use of Estimates and Uncertainties Use of Estimates, Policy [Policy Text Block] Less: current portion of benefit obligation Current liability Liability, Defined Benefit Plan, Current Current liability Less: current portion Liability, Defined Benefit Pension Plan, Current Vesting percentage on each anniversary date Defined Benefit Plan Payment Award Vesting Rights Percentage Vesting percentage of the award on each anniversary date. Schedule of Financial Instruments and Balance Sheet Classification Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Subsequent Event Subsequent Events [Text Block] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Total equity investments Equity Securities [Member] Unearned compensation, non-current Unearned Compensation Non Current The amount advanced to employees that we consider unearned compensation that will vest and therefore be expensed in more than one year. Long-term benefit obligation accrued, number of participants Benefit Obligation Accrued Number Of Participants Benefit Obligation Accrued Number Of Participants Total liabilities Liabilities Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Dividends paid to noncontrolling interest Payments of Ordinary Dividends, Noncontrolling Interest Current Year Acquisition Lucas Group And Patina Solutions Group [Member] Lucas Group and Patina Solutions Group. 2031 Finance Lease, Liability, to be Paid, Year Five Intellectual property Intellectual Property [Member] Company's additional matching contribution Defined Contribution Plan, Employer Discretionary Contribution Amount Related To Prior Year Employee Contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Related To Prior Year Employee Contributions Executive Capital Accumulation Plan ECAP Executive Capital Accumulation Plan [Member] Executive Capital Accumulation Plan [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Outstanding policy loans Policy Loans Payable Policy Loans Payable Schedule of Total Benefit Obligations Schedule of Costs of Retirement Plans [Table Text Block] Sale/maturities of available-for-sale marketable securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Issuance of stock Stock Issued During Period, Value, New Issues Consolidation Items Consolidation Items [Axis] Variable Rate Variable Rate [Axis] Asia Pacific Executive Search, Asia Pacific [Member] Executive Search, Asia Pacific EMEA Executive Search, EMEA [Member] Executive Search, EMEA Employees stock purchased, average price per share (in dollars per share) Employee Stock Purchase Plan Purchase Price Of Shares Purchased Purchase price paid by employees for common stock through an employee stock purchase plan. Fair Value Cash and Cash Equivalents Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]