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Short-term Financing (Credit Facility Amount Borrowed) (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 6 days | 6 days
Maximum amount borrowed | $ 469.0 | $ 394.5
Weighted-average amount borrowed | $ 288.3 | $ 216.3
Weighted-average interest rate | 5.33% | 4.99%
JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 10 days | 4 days
Maximum amount borrowed | $ 450.0 | $ 223.0
Weighted-average amount borrowed | $ 395.6 | $ 133.4
Weighted-average interest rate | 3.27% | 4.99%
PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 88 days | 88 days
Maximum amount borrowed | $ 56.6 | $ 56.8
Weighted-average amount borrowed | $ 54.8 | $ 56.0
Weighted-average interest rate | 3.07% | 2.53%

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- Definition Debt Weighted Average Interest Rate 1 + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility, Number Of Days Borrowed + References No definition available. + Details
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Namespace Prefix: | payx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Period Type: |