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v3.25.2

Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2025 | May 31, 2024 | May 31, 2023
Revenue from Contract with Customer [Abstract] |  |  |
Payroll wages and payroll taxes | $ 29,280.0 | $ 27,381.5 | $ 26,025.3
State unemployment insurance (included in payroll wages and payroll taxes) | 167.4 | 151.8 | 138.2
Guaranteed cost benefit plans | $ 681.6 | $ 660.3 | $ 656.3

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- Definition Direct Pass Through Cost Guaranteed Cost Benefit Plans + References No definition available. + Details
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Namespace Prefix: | payx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance + References No definition available. + Details
Name: | payx_DirectPassThroughCostPayrollWagesAndTaxesIncludingFederalAndStateUnemploymentInsurance
Namespace Prefix: | payx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Direct Pass Through Cost State Unemployment Insurance + References No definition available. + Details
Name: | payx_DirectPassThroughCostStateUnemploymentInsurance
Namespace Prefix: | payx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration