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Commitments and Contingencies (Details) (USD $) In Millions | 12 Months Ended
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May 31, 2011 | May 31, 2010 | May 31, 2009
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Lines of credit outstanding | $ 0 |  |
Irrevocable standby letters of credit | 47.4 | 50.3 |
Irrevocable stand by letters of credit outstanding | 0 |  |
Expiry date range of letter of credit | July 2011 to December 2011 |  |
Rent expense | 45.4 | 46.9 | 46.6
Minimum future payment obligations under purchase orders and contractual arrangements | 72.4 |  |
Commitments to purchase capital assets | 6.0 |  |
JP Morgan Chase Bank, N.A. [Member] |  |  |
Lines of credit |  |  |
Amount available | 350 |  |
Expiration date | February 2012 |  |
Bank of America, N.A. [Member] |  |  |
Lines of credit |  |  |
Amount available | 250 |  |
Expiration date | February 2012 |  |
PNC Bank, National Association [Member] |  |  |
Lines of credit |  |  |
Amount available | 150 |  |
Expiration date | February 2012 |  |
Wells Fargo Bank, National Association [Member] |  |  |
Lines of credit |  |  |
Amount available | $ 150 |  |
Expiration date | February 2012 |  |

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- Definition Commitments and Contingencies. + Details
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Namespace Prefix: | payx
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Commitments to purchase capital assets. + Details
Name: | payx_CommitmentsToPurchaseCapitalAssets
Namespace Prefix: | payx
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Expiry Date Range of Letter of Credit. + Details
Name: | payx_ExpiryDateRangeOfLetterOfCredit
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Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Irrevocable stand by letters of credit. + Details
Name: | payx_IrrevocableStandByLettersOfCredit
Namespace Prefix: | payx
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Irrevocable stand by letters of credit outstanding. + Details
Name: | payx_IrrevocableStandByLettersOfCreditOutstanding
Namespace Prefix: | payx
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum future payment obligations under purchase orders and contractual arrangements. + Details
Name: | payx_MinimumFuturePaymentObligationsUnderPurchaseOrdersAndContractualArrangements
Namespace Prefix: | payx
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Rent expense. + Details
Name: | payx_RentExpense
Namespace Prefix: | payx
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount borrowed under the credit facility as of the balance-sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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