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Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020
Service Revenue [Abstract] |  |
Payroll wages and payroll taxes | $ 5,600.0 | $ 4,900.0
State unemployment insurance (included in payroll wages and payroll taxes) | 15.4 | 12.8
Guaranteed cost benefit plans | $ 150.9 | $ 150.4

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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
Period Type: | duration

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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