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Short-term Financing (Lines of Credit Facility Amount Available) (Details) $ in Millions | 9 Months Ended
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Feb. 28, 2017 USD ($)
JP Morgan Chase Bank, N.A. [Member] |
Line of Credit Facility [Line Items] |
Amount available | $ 350
Expiration date | Feb. 28, 2018
Bank of America, N.A. [Member] |
Line of Credit Facility [Line Items] |
Amount available | $ 250
Expiration date | Feb. 28, 2018
PNC Bank, National Association [Member] |
Line of Credit Facility [Line Items] |
Amount available | $ 150
Expiration date | Feb. 28, 2018
Wells Fargo Bank, National Association [Member] |
Line of Credit Facility [Line Items] |
Amount available | $ 150
Expiration date | Feb. 28, 2018

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
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
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_LineOfCreditFacilityAxis=payx_BankOfAmericaN.a.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=payx_PncBankNationalAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=payx_WellsFargoBankNationalAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |