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United States UNITED STATES Capital stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Income and other taxes Taxes Payable, Current Current Assets Assets, Current [Abstract] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Treasury stock, at cost Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Measured on Recurring Basis Fair Value, Recurring [Member] Income Taxes Income Tax Disclosure [Text Block] Debt and equity securities, realized gain (loss) Debt and Equity Securities, Realized Gain (Loss) Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Business Talent Group, LLC Business Talent Group, LLC [Member] Business Talent Group, LLC [Member] Accounts payable and accrued liabilities, current Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable and Accrued Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable and Accrued Liabilities Text Block [Abstract] PersolKelly Pte. Ltd. PersolKelly Pte. Ltd. [Member] PersolKelly Pte. Ltd. Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Net cash from investing activities Net Cash Provided by (Used in) Investing Activities Segment Earnings From Operations Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Income Taxes [Line Items] Income Taxes [Line Items] [Line Items] for Income Taxes [Table] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Loss contingency, portion not accrued Loss Contingency, Range of Possible Loss, Portion Not Accrued Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Entity Shell Company Entity Shell Company Investment in Persol Holdings [Abstract] Investment in Persol Holdings [Abstract] Investment in Persol Holdings [Abstract] Total current liabilities Liabilities, Current Payments of tax withholding for stock awards Payment, Tax Withholding, Share-based Payment Arrangement Class of Stock [Domain] Class of Stock [Domain] Less: Intersegment Less: Intersegment revenue Intersegment Eliminations [Member] Purchase price paid at closing Cash consideration paid Payments to Acquire Businesses, Gross Loss Contingencies [Table] Loss Contingencies [Table] Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Proceeds from sale of Persol Holdings investment Proceeds from Sale of Equity Securities, FV-NI Current Fiscal Year End Date Current Fiscal Year End Date Vesting adjustment (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Adjustment Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Adjustment Statement [Table] Statement [Table] Shares Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Current period provision Accounts Receivable, Current Period Provision Accounts Receivable, Current Period Provision Statistical Measurement [Axis] Statistical Measurement [Axis] Subsequent Event Subsequent Event [Member] Financing receivable, allowance for credit loss Financing Receivable, Allowance for Credit Loss Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Other expense Other Nonoperating Expense Changes in the Net Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Pension liability adjustments: Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Adjustments to reconcile net earnings (loss) to net cash from operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]