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Leases (Supplemental Cash Flow Information Related to Leases) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019
Leases [Abstract] |  |  |
Cash paid for amounts included in the measurement of lease liabilities | $ 32.2 | $ 41.6 |
Amortization of ROU assets | 29.2 | 34.4 |
ROU assets obtained in exchange for new operating lease liabilities | 26.8 | 21.5 |
Lease incentives received in the form of tenant allowances and free rent | $ 0.8 | $ 6.1 | $ 3.5

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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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Balance Type: | credit
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- Definition Operating Lease Right Of Use Asset Amortization + References No definition available. + Details
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Namespace Prefix: | payx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
Name: | us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix: | us-gaap_
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Balance Type: | debit
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