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Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2022 | Aug. 31, 2021
Revenue from Contract with Customer [Abstract] |  |
Payroll wages and payroll taxes | $ 6,337.8 | $ 5,557.2
State unemployment insurance (included in payroll wages and payroll taxes) | 9.5 | 15.4
Guaranteed cost benefit plans | $ 156.7 | $ 150.9

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- Definition Direct Pass Through Cost Guaranteed Cost Benefit Plans + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance + References No definition available. + Details
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Namespace Prefix: | payx_
Data Type: | xbrli:monetaryItemType
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- Definition Direct Pass Through Cost State Unemployment Insurance + 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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- References No definition available. + Details
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