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v3.19.2

Related Parties (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2019 | May 31, 2018 | May 31, 2017
EMC Corporation [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases from related parties | $ 2.0 | $ 0.5 | $ 0.6
Staples, Inc. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases from related parties | 3.1 | $ 2.7 | $ 2.9
Cognizant Technology Solutions Corporation [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases from related parties | $ 1.6 |  |

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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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=payx_EmcCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=payx_StaplesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=payx_CognizantTechnologySolutionsCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |