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Note H Weighted-average common shares outstanding, assuming dilution Weighted-average common shares outstanding, assuming dilution Weighted Average Number of Shares Outstanding, Diluted Guaranteed cost benefit plans Direct Pass Through Cost Guaranteed Cost Benefit Plans Direct Pass Through Cost Guaranteed Cost Benefit Plans APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Stock-based compensation costs APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Interest receivable Interest Receivable, Current Minimum [Member] Minimum [Member] Gross realized gains Debt Securities, Available-for-Sale, Realized Gain Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Share Repurchase Program, Excise Tax Repurchases of common shares, excise taxes Dividends paid Payments of Ordinary Dividends, Common Stock Net purchases of short-term accounts receivable Net Payments Collections Short Term Accounts Receivable Net (payments) collections short term accounts receivable. Recurring [Member] Fair Value, Recurring [Member] Due after three years through five years, Fair value Available-for-sale Securities, Debt Maturities, After Year Three Through Year Five, Fair Value Fair value of available-for-sale debt securities maturing after the third fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Common stock, shares issued Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Segment Reporting [Line Items] Income taxes Income Tax Expense (Benefit) Income Tax Expense (Benefit), Total Income tax expense Available-for-sale securities maturity date Debt Securities, Available-for-Sale, Maturity Date Net change in client fund obligations Net Change In Client Fund Obligations Net change in client fund obligations. Net Change In Client Fund Obligations, Total Municipal Bonds [Member] Municipal Bonds [Member] Repayment of long-term private placement debt Repayments of Debt Revenue performance obligations timing Revenue, Performance Obligation, Description of Timing Premiums Paid On Cash Flow Hedges Premiums paid on cash flow hedges. Premiums paid on cash flow hedges PNC Bank, National Association [Member] Pnc Bank National Association [Member] PNC Bank, National Association [Member] Classification of Investments on Consolidated Balance Sheets Classification Of Investments On Consolidated Balance Sheets [Table Text Block] Tabular disclosure of classification of investments on consolidated balance sheets. Write-down of building Asset, Impairment Loss Asset Impairment Charges, Total Lessee Operating Number Of Leases Not Yet Commenced Lessee Operating Number Of Leases Not Yet Commenced Number of lease agreement, not yet commenced Balance, beginning of period Balance, end of period Contract with Customer, Liability Contract with Customer, Liability, Total Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Senior unsecured credit facility Number of clients creating a credit concentration Concentration Risk Number Of Client Number of Clients Creating a Credit Concentration Accrued income taxes Accrued Income Taxes, Current AFS securities, Amortized cost Debt Securities, Available-for-Sale, Amortized Cost Subsequent Event Type [Domain] Receivable Type [Axis] Other, Gross unrealized losses Other Securities Gross Unrealized Losses Other Securities Gross Unrealized Losses Seven Year Fixed Rate Corporate Bonds [Member] Seven year fixed rate corporate bonds. 7-Year Fixed Rate Corporate Bonds [Member] Deferred costs Increase (Decrease) in Deferred Charges Restricted cash Restricted Cash, Current Asset-Backed Securities [Member] Asset-Backed Securities [Member] Nonoperating Income (Expense) Other income, net Other income, net Schedule of Long-Term Debt Instruments [Table] PEO Health Insurance Dental And Vision Plan Costs Current Liabilities PEO Health Insurance Dental And Vision Plan Costs Current Liabilities PEO accrued health insurance and dental and vision plan reserves in current liabilities Income Statement [Abstract] Total funds held for clients and corporate investments, Amortized cost Funds Held For Clients And Corporate Investments Amortized Cost Funds held for clients and corporate investments amortized cost. Basic earnings per share Earnings Per Share, Basic Earnings Per Share, Basic, Total Document Period End Date Period End Date Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment, Total Debt Instrument [Line Items] Common stock, shares authorized Common Stock, Shares Authorized Statement of Stockholders' Equity [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Professional Employer Organization ("PEO") Unbilled Receivables, Net of Advance Collections Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block] Long-term deferred costs Capitalized Contract Cost, Net, Noncurrent Payment for Contingent Consideration Liability, Financing Activities Contingent consideration paid for acquisitions State unemployment insurance (included in payroll wages and payroll taxes) Direct Pass Through Cost State Unemployment Insurance Direct Pass Through Cost State Unemployment Insurance Total expenses Costs and Expenses Assets Total assets Title of 12(b) Security Allowance for Doubtful Accounts Receivable, Write Offs and Recoveries Allowance for doubtful accounts receivable, write offs and recoveries. Write-offs and recoveries Goodwill Goodwill Goodwill, Total Goodwill, Beginning Balance Goodwill, Ending Balance Payments for Repurchase of Common Stock Repurchases of common shares Reclassification, Comparability Adjustment [Policy Text Block] Reclassifications Derivative, Notional Amount Aggregate notional amount Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent, Total Noncore [Member] Other Nonoperating Income and Expense [Text Block] Other Income, Net Prepaid income taxes Prepaid Taxes Description of Business Nature of Operations [Text Block] Schedule of Total Revenue, Net Income and Significant Expenses Used by the Chief Operating Decision Maker Segment Reporting [Table Text Block] Total accounts receivable, gross Receivables Accounts Notes And Loans Receivable Gross Current Accounts Notes And Loans Receivable Gross Current Compensation Expense, Excluding Cost of Good and Service Sold Compensation-related expenses Due after five years, Fair value Available-for-sale Securities, Debt Maturities, after Five Years, Fair Value Fair value of available-for-sale debt securities maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Purchases of AFS securities Payments to Acquire Debt Securities, Available-for-Sale Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Beginning balance Total stockholders' equity Equity, Attributable to Parent Ending balance Paychex of New York LLC [Member] Paychex of New York LLC [Member] Paychex of New York LLC. Other Assets, Noncurrent, Total Other long-term assets Other Assets, Noncurrent Income Taxes Income Tax Disclosure [Text Block] Due after one year through three years, Amortized cost Available-for-sale Securities, Debt Maturities, After Year One Through Year Three, Amortized Cost Basis Amount after adjustments of available-for-sale debt securities at cost, maturing after the first fiscal year through the third fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Other long-term liabilities Other Liabilities, Fair Value Disclosure Funds Held For Clients Money Market Securities And Other Cash Equivalents Gross Unrealized Losses Funds Held For Clients Money Market Securities And Other Cash Equivalents Gross Unrealized Losses Funds held for clients' money market securities and other restricted cash equivalents, Gross unrealized losses Basic and Diluted Earnings Per Share Earnings Per Share [Text Block] Long-Term Debt, Fair Value Long-term borrowings, Fair value Due in one year or less, Fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Number of reportable segments Number of Reportable Segments Revenue [Member] Revenue Benchmark [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Long-Term Debt Long-Term Debt, Total Long-term borrowings, Amortized cost Credit Facility [Axis] Due after five years, Amortized cost Available-for-sale Securities, Debt Maturities, after Five Years, Amortized Cost Basis Amount after adjustments of available-for-sale debt securities at cost, maturing after the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Reconciliation of cash, restricted cash, and equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Outstanding loans Line of Credit, Current AFS securities, Gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Authorized In May 2027 [Member] Authorized In May 2027. Authorized In May 2027 [Member] Commitments to purchase capital assets Contractual Obligation Contractual Obligation, Total Revolving Credit Facility [Member] Revolving Credit Facility [Member] Total funds held for clients and corporate investments, Fair value Funds Held For Clients And Corporate Investments Fair Value Funds held for clients and corporate investments, fair value. Total funds held for clients and corporate investments, Fair value Lessee Operating Lease Liability Payments Not Yet Commenced Lessee Operating Lease Liability Payments Not Yet Commenced Lease payments, not yet commenced Accounts receivable, net of allowance for credit losses Accounts and Financing Receivable, after Allowance for Credit Loss, Current Accounts receivable, net of allowance for credit losses Authorized In May 2019 [Member] Authorized In May2019 [Member] Authorized In May 2019 [Member] Due in one year or less, Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Statistical Measurement [Axis] Stock-Based Compensation Costs Share-Based Payment Arrangement [Policy Text Block] Current liabilities before client fund obligations Current liabilities before client fund obligations Current liabilities before client fund obligations. Money Market Securities [Member] Money Market Funds [Member] Total, Fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Entity Interactive Data Current Common Stock, Value, Issued Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common stock, $0.01 par value; Authorized: 600.0 shares; Issued and outstanding: 356.0 shares as of August 31, 2026 and 355.6 shares as of May 31, 2026 Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from Sale of Property, Plant, and Equipment, Total Total liabilities Liabilities Cost of service revenue Cost of Revenue Cost of Revenue, Total Total funds held for clients and corporate investments, Gross unrealized losses Total funds held for clients and corporate investments, Gross unrealized losses Funds Held For Clients And Corporate Investments Gross Unrealized Losses Funds Held For Clients And Corporate Investments Gross Unrealized Losses Senior Notes [Member] Financial Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Product and Service [Axis] Retained earnings Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Restricted and unrestricted cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Cash dividends declared, per share Common Stock, Dividends, Per Share, Declared Revenue: Revenues [Abstract] Debt financing fees, including structuring and commitment fees Debt Related Commitment Fees and Debt Issuance Costs 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] Current assets before funds held for clients Current assets before funds held for clients Current assets before funds held for clients. Interest Rate Swaption [Member] Workers' Compensation Liability, Noncurrent Deferred income taxes Deferred Income Tax Liabilities, Net Deferred Income Tax Liabilities, Net, Total Accounts, Notes, Loans and Financing Receivable [Line Items] Long-Term Debt, Maturity Date Maturity date Restricted cash Restricted Cash Restricted Cash, Total Five Year Fixed Rate Bonds [Member] Five year fixed rate bonds member. 5-Year Fixed Rate Bonds [Member] Standby Letters of Credit [Member] Standby Letters of Credit [Member] Fair Value Hierarchy and NAV [Axis] Corporate Bonds [Member] Corporate Debt Securities [Member] Unused amount available Line of Credit Facility, Remaining Borrowing Capacity Available-for-sale securities AFS securities, Fair value AFS securities, Fair value Debt Securities, Available-for-Sale Ten Year Fixed Rate Bonds [Member] Ten year fixed rate bonds member. 10-Year Fixed Rate Bonds [Member] Share Repurchase Program [Axis] Other Other Assets, Fair Value Disclosure Maximum individual workers' compensation claims liability Maximum Individual Claims Liability Workers Compensation Insurance Maximum individual claims liability workers compensation insurance. Total liabilities and stockholders' equity Liabilities and Equity Funds Held for Clients and Corporate Investments [Abstract] Funds held for clients and corporate investments. Gross realized losses Debt Securities, Available-for-Sale, Realized Loss Bridge Loan Facility [Member] Bridge loan facility. Bridge Loan Facility [Member] Lessee, Lease, Description [Table] Document Fiscal Period Focus Document Fiscal Period Focus Deferred revenue related to material rights Revenue performance obligations Revenue, Remaining Performance Obligation, Amount Peo And Insurance Solutions [Member] PEO And Insurance Solutions [Member] PEO and Insurance Solutions [Member] Other, Gross unrealized gains Other Securities Gross Unrealized Gains Other Securities Gross Unrealized Gains Line of Credit Facility, Current Borrowing Capacity Aggregate amount of principal available Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Amounts outstanding Letters of Credit Outstanding, Amount Interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Five Year Fixed Rate Corporate Bonds [Member] Five year fixed rate corporate bonds. 5-Year Fixed Rate Corporate Bonds [Member] Net change in cash, restricted cash, and equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Entity Current Reporting Status Entity Current Reporting Status Quoted Prices in Active Markets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Accounts payable Accounts Payable, Current Accounts Payable, Current, Total Financial Instrument [Axis] Interest Income, Operating Interest on funds held for clients Interest Income, Operating, Total Document Transition Report Total, Gross unrealized losses Gross unrealized losses on available-for-sale securities Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total Commitments and Contingencies Disclosure [Abstract] Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Lease not yet commenced, term of contract Weighted-average interest rate Debt, Weighted Average Interest Rate Common Stock [Member] Common Stock [Member] Single Reportable Segment [Member] Single reportable segment. Single Reportable Segment [Member] Schedule of Other Nonoperating Income (Expense) [Table Text Block] Schedule of Other Income, Net Credit Facility [Domain] Credit Facility [Domain] Range [Domain] Statistical Measurement [Domain] Core business operations: Core Business Operations [Abstract] Core business operations. Maximum individual health insurance claims liability Maximum Individual Claims Liability Health Insurance Maximum Individual Claims Liability Health Insurance Schedule of Available-for-sale Securities [Line Items] Debt Securities, Available-for-Sale [Line Items] Equity, Attributable to Parent [Abstract] STOCKHOLDERS' EQUITY Stockholders' equity Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic, Total Assets [Abstract] ASSETS Assets Accounting Policies [Table] Accounting Policies [Table] Entity Central Index Key Entity Central Index Key Accounts Receivable, Net of Allowance for Credit Losses Receivable [Policy Text Block] U.S. Government Agency And Treasury Securities [Member] US Treasury and Government [Member] Deferred Tax Assets, Net Deferred Tax Assets, Net, Total Net of deferred taxes Other current liabilities Other Liabilities, Current Other Liabilities, Current, Total Stock Issued During Period, Shares, Acquisitions Acquisition of businesses, Shares Current Fiscal Year End Date Current Fiscal Year End Date Funds held for clients Funds Held for Clients Funds Held for Clients, Total Document Quarterly Report Debt Securities, Available-for-Sale [Table] Net change in short-term borrowings Proceeds from Short-Term Debt Proceeds from Short-term Debt, Total Business Combination, Acquisition-Related Cost, Expense Acquisition-related costs Acquisition-related costs Significant Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Line of Credit Facility, Expiration Period Term of unsecured line of credit facility Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Entity Incorporation, State or Country Code Diluted earnings per share Earnings Per Share, Diluted Earnings Per Share, Diluted, Total Non Core Business Operations [Abstract] Non-core business operations. Non-core business operations: Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Summary of PEO Pass-Through Costs Netted in Revenue Pass Through Costs Netted Within Revenue [Table Text Block] Pass Through Costs Netted Within Revenue [Table Text Block] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Other comprehensive income/(loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total Other comprehensive (loss)/income, net of tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Two Thousand And Seventeen Credit Facility [Member] 2017 Credit Facility. 2017 Credit Facility [Member] Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Description of Business, Basis of Presentation, and Significant Accounting Policies Fair Value, Measurement Frequency [Domain] Measurement Frequency [Domain] Scenario, Unspecified [Domain] Scenario [Domain] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Balance, beginning of period Accounts Receivable, Allowance for Credit Loss Balance, end of period Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Summary of Changes in Deferred Revenue Related to Material Rights Performance Obligations Equity Components [Axis] Investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Statement of Cash Flows [Abstract] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Income Tax Disclosure [Abstract] Securities in an unrealized loss position for less than twelve months, Gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Intangible assets, net of accumulated amortization Intangible Asset, Excluding Goodwill, after Accumulated Amortization Intangible Assets, Net (Excluding Goodwill), Total Fair Value Measurements Fair Value Disclosures [Text Block] Deferral of revenue Contract With Customer Liability Additions Contract With Customer Liability Additions Deferred revenue, timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Capitalized Contract Cost [Line Items] Depreciation and amortization Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization, Total Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Funds Held for Clients and Corporate Investments Components Of Funds Held For Clients And Corporate Investments [Table Text Block] Tabular disclosure of components of funds held for clients and corporate investments. Derivative Contract [Domain] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Cash Flow Hedges [Member] OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Unrealized gains/(losses), gross Unrealized gains on securities, net of tax expense (benefit) Individual workers' compensation claims liability Individual Claims Liability Workers Compensation Insurance Individual Claims Liability Workers Compensation Insurance Weighted-average anti-dilutive common share equivalents Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Accumulated Other Comprehensive Income [Member] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss [Member] Accounts payable and other current liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Authorized In January 2026 [Member] Authorized In January 2026 [Member] Authorized In January 2026. 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Paycor HCM, Inc [Member] Subsequent Event [Member] Accounting Standards Update [Extensible Enumeration] Operating income Operating Income (Loss) PEO Insurance Reserves Liability Reserve Estimate, Policy [Policy Text Block] Share Repurchase Program, Authorized expired, Amount Share repurchase program, authorized expired, amount. Repurchase authorization expired Lender Name [Axis] Cash dividends declared Dividends, Common Stock, Cash Interest Rate Swaptions, Fair Value Disclosure Interest rate swaptions, fair value disclosure. Interest Rate Swaptions Segment Reporting [Table] Asset Class [Domain] Asset Class [Domain] Entity File Number Securities Act File Number Service Revenue Revenue from Contract with Customer [Text Block] Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Change in accounting principle, accounting standards update, immaterial effect [true false] Interest Expense Excluding Acquisition Related Costs Interest expense excluding acquisition related costs. Interest expense, excluding Paycor acquisition-related costs Interest expense, excluding Paycor acquisition-related costs Workers' Compensation Liability, Current Revenue performance obligations timing, years Revenue Performance Obligations Timing Years Revenue Performance Obligations Timing Years Balance, beginning of period Balance, end of period Capitalized Contract Cost, Net Capitalized Contract Cost, Net, Total Retained Earnings [Member] Retained Earnings [Member] Entity Registrant Name Entity Registrant Name Accounting Policies [Abstract] Depreciation expense Depreciation Depreciation, Total Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Selling, General and Administrative Expense, Total Selling, general and administrative expenses Selling, General and Administrative Expense Service Revenue [Table] Service Revenue [Table] Interest income on corporate investments Investment Income, Nonoperating Investment Income, Nonoperating, Total Activity related to equity-based plans Equity activity related to stock-based awards Equity activity related to stock-based awards. Includes proceeds from stock option exercises and cash usage related to stock withheld to cover taxes on lapsing of stock-based awards. Entity Address, Address Line One Expiration date of credit facility Line of Credit Facility, Expiration Date Two thousand And Nineteen Credit Facility [Member] 2019 Credit Facility 2019 Credit Facility [Member] PEO Direct Insurance Costs PEO direct insurance costs. PEO direct insurance costs Due after three years through five years, Amortized cost Available-for-sale Securities, Debt Maturities, After Year Three Through Year Five, Amortized Cost Basis Amount after adjustments of available-for-sale debt securities at cost, maturing after the third fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Total current assets Assets, Current Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Segments [Axis] Derivative Instruments Derivatives, Policy [Policy Text Block] Authorized In July 2021 [Member] Authorized In July2021 [Member] Authorized In July 2021 [Member] Schedule of Accounts Receivable, Net of Allowance for Credit Losses Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Funds Held For Clients Money Market Securities And Other Cash Equivalents Gross Unrealized Gains Funds Held For Clients Money Market Securities And Other Cash Equivalents Gross Unrealized Gains Funds held for clients' money market securities and other restricted cash equivalents, Gross unrealized gains Funds held for clients' money market securities and other restricted cash equivalents, Gross unrealized gains Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Provision on deferred income taxes Entity Small Business Long-term borrowings, net of debt issuance costs Long-Term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities, Total Dilutive effect of common share equivalents Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Incremental Common Shares Attributable to Share-based Payment Arrangements, Total Proceeds from sales and maturities of AFS securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total Long-Term Debt, Type [Axis] Change in Accounting Principle, Accounting Standards Update, Adoption Date Change in accounting principle, accounting standards update, adoption date Accrued corporate compensation and related items Employee-related Liabilities, Current Employee-related Liabilities, Current, Total Peo Aggregate Claims Exceeding1.0m [Member] PEO Aggregate Claims Exceeding $1.0M [Member] PEO Aggregate Claims Exceeding $1.0M [Member] Impairment loss relates to goodwill or intangible assets Intangible Asset, Including Goodwill, Impairment Loss Goodwill and Intangible Asset Impairment, Total Earnings Per Share [Abstract] Other comprehensive income (Note K) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Total Core and Noncore Status [Axis] Subsequent Event Type [Axis] Product and Service [Domain] Product and Service [Domain] Funds held for clients' money market securities and other restricted cash equivalents, Fair value Funds Held For Clients Money Market Securities And Other Cash Equivalents Fair Value Funds held for clients money market securities and other cash equivalents, fair value. Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Less: Allowance for credit losses Measurement Frequency [Axis] Accounts Receivable, Allowance for Credit Loss [Table Text Block] Schedule of Activity in Allowance for Credit Losses Related to Accounts Receivables Financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Purchased Receivables [Member] Financing Receivable [Member] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Liabilities [Abstract] LIABILITIES Liabilities Supplemental Information Supplemental Information [Text Block] Supplemental Information [Text Block] Entity Tax Identification Number Costs To Obtain Contracts [Member] Costs To Obtain Contract [Member] Costs To Obtain Contract [Member] PEO unbilled receivables, net of advance collections Unbilled Receivables, Current Derivative Instrument [Axis] Equity Component [Domain] Equity Component [Domain] Entity Address, City or Town Business Combination [Axis] Summary of Deferred Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Segments [Domain] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Commercial Paper [Member] Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax, Total Reclassification adjustment to earnings, gross Reclassification adjustment for realized gains (losses) on securities, net of tax expense Deferred revenue Contract with Customer, Liability, Current Senior Notes, Series B [Member] Series B Senior Notes [Member] Series B Senior Notes [Member] Statement [Table] Statement [Table] Debt Securities, Available-for-Sale, Realized Gain (Loss) Net realized (gains)/losses on sales of AFS securities Net realized gains/(losses) Activity related to equity-based plans, Shares Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Stock-based compensation costs recognized Share-Based Payment Arrangement, Expense Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Advance collections Advance Collections Current Advance Collections Current Entity Shell Company Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Other Income and Expenses [Abstract] Statement [Line Items] Statement [Line Items] Due after one year through three years, Fair value Available-for-sale Securities, Debt Maturities, After Year One Through Year Three, Fair Value Fair value of available-for-sale debt securities maturing after the first fiscal year through the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Maximum [Member] Maximum [Member] Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts Capitalized Contract Cost [Table Text Block] Capitalized Contract Cost [Axis] Funds held for clients' money market securities and other restricted cash equivalents, Amortized cost Funds Held For Clients Money Market Securities And Other Cash Equivalents Amortized Cost Funds held for clients money market securities and other cash equivalents, amortized cost. Senior Notes, Series A [Member] Series Senior Notes [Member] Series A Senior Notes [Member] Variable Rate Demand Obligation [Member] VRDNs [Member] Variable Rate Demand Notes [Member] Business Combination [Domain] Seven Year Fixed Rate Bonds [Member] Seven year fixed rate bonds member. 7-Year Fixed Rate Bonds [Member] Funds Held for Clients and Corporate Investments Funds Held for Clients and Corporate Investments Disclosure [Text Block] Funds held for clients and corporate investments. Concentration Risk Benchmark [Axis] Authorized in January 19 2024. Authorized In January 19 2024 [Member] Authorized In January 19 2024 [Member] Authorization repurchase expiration date Expiration date Share Repurchase Program, Expiration Date Asset Class [Axis] Change in deferred tax liability Goodwill, offset by reduction to change in deferred tax liability Goodwill, offset by reduction to change in deferred tax liability. Basic earnings per share: Earnings Per Share, Basic [Abstract] Core [Member] Restricted cash and restricted cash equivalents included in funds held for clients Restricted Cash And Restricted Cash Equivalents Included In Funds Held For Clients Amount of restricted cash and restricted cash equivalents included in funds held for clients. Document Fiscal Year Focus Document Fiscal Year Focus AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Net unrealized (loss)/gain on AFS securities [Member] Accretion (Amortization) of Discounts and Premiums, Investments Amortization of premiums and discounts on AFS securities, cash flow hedges and long-term debt, net Amortization of premiums and discounts on AFS securities and long-term debt, net Common stock, shares outstanding Beginning balance, Shares Ending balance, Shares Common Stock, Shares, Outstanding Total funds held for clients and corporate investments, Gross unrealized gains Funds Held For Clients And Corporate Investments Gross Unrealized Gains Funds Held For Clients And Corporate Investments Gross Unrealized Gains Total funds held for clients and corporate investments, Gross unrealized gains Accounting Policies [Line Items] Accounting Policies [Line Items] Major Types of Debt and Equity Securities [Domain] Financial Instruments [Domain] Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance Payroll wages and payroll taxes Forecast [Member] Forecast [Member] Capitalization of costs Capitalized Contract Cost Capitalized Contract Cost Repurchases of common shares including excise taxes, Shares Stock Repurchased and Retired During Period, Shares Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change in accounting principle, accounting standards update, adopted [true false] Operating lease liabilities Operating Lease, Liability, Noncurrent Recognition of unearned revenue Contract with Customer, Liability, Revenue Recognized Securities in an unrealized loss position for less than twelve months, Fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Core and Noncore Status [Domain] Additional paid-in capital Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Security Exchange Name Management Solutions [Member] Management Solutions [Member] Management Solutions [Member] Total revenue Revenues Total revenue Recently Adopted and Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Entity Address, State or Province JP Morgan Chase Bank, NA [Member] Jp Morgan Chase Bank Na [Member] JP Morgan Chase Bank, N.A. [Member] Securities in Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Operating lease right-of-use assets, net of accumulated amortization Operating Lease, Right-of-Use Asset Amendment Flag Amendment Flag Amortization of deferred contract costs Amortization Capitalized Contract Cost, Amortization Debt Instrument [Axis] Other Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Total cash, restricted cash, and equivalents Cash, restricted cash, and equivalents, beginning of period Cash, restricted cash, and equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Client fund obligations Client Fund Obligations Client fund obligations. Impairment loss Capitalized Contract Cost, Impairment Loss City Area Code Interest expense Interest Expense, Nonoperating Interest Expense, Nonoperating, Total OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Tax expense/(benefit) on unrealized gains/losses Unrealized gains (losses) on securities, tax Accounts and Financing Receivables [Table] Restricted Cash and Restricted Cash Equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Number of available-for-sale securities in an unrealized loss position Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Expenses: Operating Expenses [Abstract] Realized Gains and Losses from Sale of Available-for-sale Securities Realized Gain (Loss) on Investments [Table Text Block] Common stock, par value Common Stock, Par or Stated Value Per Share Current liabilities Total current liabilities Liabilities, Current Other, Amortized cost Other Securities Amortized Cost Other securities amortized cost. Net change in operating lease right-of-use assets and liabilities Increase Decrease In Operating Lease Right Of Use Assets and Liabilities, Net Increase Decrease In Operating Lease Right Of Use Assets and Liabilities, Net Segment Reporting [Text Block] Segment Reporting Purchases of other assets, net Payments to Acquire Other Productive Assets Trading Symbol Share Repurchase Program [Domain] Share Repurchase Program [Domain] Supplemental Information [Abstract] Supplemental Information [Abstract] Entity Emerging Growth Company Accounts And Unbilled Receivables [Member] Accounts And Unbilled Receivables [Member] Accounts And Unbilled Receivables [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] 2020 Credit Facility [Member] Twenty Twenty Credit Facility [Member] Twenty Twenty Credit Facility [Member] Capitalized Contract Cost [Table] Other long-term liabilities Other Liabilities, Noncurrent Other Liabilities, Noncurrent, Total Accrued income taxes Accrued Income Taxes, Noncurrent 10-Year Fixed Rate Corporate Bonds [Member] Ten Year Fixed Rate Corporate Bonds [Member] Ten year fixed rate corporate bonds. Cover [Abstract] Cover Accrued worksite employee compensation and related items Accrued Worksite Employee Compensation And Related Items Accrued Worksite Employee Compensation And Related Items Other segment items Segment Reporting, Other Segment Item, Amount Revenue from Contract with Customer [Abstract] Long-Term Debt, Type [Domain] Net unrealized losses on available-for-sale securities Debt Securities, Available-for-Sale, Unrealized Gain (Loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive (loss)/income Other comprehensive income Accumulated other comprehensive loss Amortization expense Intangible Asset, Finite-Lived, Amortization Expense Amortization of Intangible Assets, Total Acquisition of businesses Stock Issued During Period, Value, Acquisitions Stock-based compensation costs Share-Based Payment Arrangement, Noncash Expense Share-based Payment Arrangement, Noncash Expense, Total 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] Fair Value Disclosures [Abstract] Cash and cash equivalents Cash and Cash Equivalent Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Ending Balance Repurchases of common shares including excise taxes Stock Repurchased and Retired During Period, Value Debt issuance fees Payments of Debt Issuance Costs Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax, Total Tax (expense)/benefit on reclassification adjustment to earnings Reclassification adjustment for realized gains (losses) on securities, tax Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash used in financing activities Trade Receivables [Member] Trade Accounts Receivable [Member] Net income Net income Net Income (Loss) Available to Common Stockholders, Basic Net income Net change in other long-term assets and liabilities Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net Other, Fair value Other Securities Fair Value Other securities fair value. Authorized In January 2024. Authorized In January 2024 [Member] Entity Filer Category Entity Filer Category Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Corporate investments Marketable Securities, Current Service Revenue [Line Items] Service Revenue [Line Items] Accounts receivable and PEO unbilled receivables, net Increase (Decrease) in Accounts Receivable Property and equipment, net of accumulated depreciation Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Securities in an unrealized loss position for more than twelve months, Fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Total service revenue Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax, Total Derivative, Premium Paid Swaption contract assets, premium paid Segment Reporting [Abstract] Percentage of available-for-sale securities in an unrealized loss position Available For Sale, Securities In Unrealized Loss Positions, Percentage Available For Sale, Securities In Unrealized Loss Positions, Percentage Entity Address, Postal Zip Code Statement of Financial Position [Abstract] Local Phone Number