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Related Parties (Details Textuals) (USD $) In Millions | 12 Months Ended
--- | ---
May 31, 2011 | May 31, 2010 | May 31, 2009
EMC Corporation [Member] |  |  |
Related Party Transactions (Textuals) [Abstract] |  |  |
Purchase from related parties | $ 5.7 | $ 3.2 | $ 4.5
Staples Inc [Member] |  |  |
Related Party Transactions (Textuals) [Abstract] |  |  |
Purchase from related parties | 1.8 | 1.5 | 0.2
Dun & Bradstreet Corporation [Member] |  |  |
Related Party Transactions (Textuals) [Abstract] |  |  |
Purchase from related parties | $ 0.4 | $ 0.4 | $ 0.5

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- Definition Related party transactions. + Details
Name: | payx_RelatedPartyTransactionsTextualsAbstract
Namespace Prefix: | payx
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration