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Short-term Financing (Lines of Credit Facility Amount Borrowed) (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions | 12 Months Ended
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May 31, 2017 | May 31, 2016
JP Morgan Chase Bank, N.A. [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 30 days | 5 days
Maximum amount borrowed | $ 450.0 | $ 450.0
Weighted-average amount borrowed | $ 196.7 | $ 305.0
Weighted-average interest rate | 2.89% | 3.39%
PNC Bank, National Association [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 353 days |
Maximum amount borrowed | $ 55.6 |
Weighted-average amount borrowed | $ 52.8 |
Weighted-average interest rate | 1.21% |

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- Definition Line of Credit Facility, Number Of Days Borrowed + References No definition available. + Details
Name: | payx_LineOfCreditFacilityNumberOfDaysBorrowed
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
Name: | us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
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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
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
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
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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