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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2014 | May 31, 2013 | May 31, 2012
Supplemental Cash Flow Information [Abstract] |  |  |
Income taxes paid | $ 317.8 | $ 371.0 | $ 301.4
Lease incentives received | $ 6.7 | $ 6.4 | $ 12.8

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- Definition The deferred credit for lease incentives received to be recognized as a reduction of rental expense over the lease term. + References No definition available. + Details
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Namespace Prefix: | payx_
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_IncomeTaxesPaid
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: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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