Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Name Accounting Standards Codification
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Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Long-Term Financing (Narrative) (Details) - USD ($) $ in Millions	May 31, 2020	May 31, 2019	Mar. 13, 2019
Aggregate principal amount	$ 800.0	$ 800.0
Company And Paychex Of New York [Member]
Aggregate principal amount			$ 800.0
Senior Notes, Series A [Member] \| Senior Notes [Member]
Aggregate principal amount	$ 400.0	400.0
Principal payment dates	Mar. 13, 2026
Senior Notes, Series A [Member] \| Senior Notes [Member] \| Company And Paychex Of New York [Member]
Aggregate principal amount			$ 400.0
Principal payment dates			Mar. 13, 2026
Senior Notes, Series B [Member] \| Senior Notes [Member]
Aggregate principal amount	$ 400.0	$ 400.0
Principal payment dates	Mar. 13, 2029
Senior Notes, Series B [Member] \| Senior Notes [Member] \| Company And Paychex Of New York [Member]
Aggregate principal amount			$ 400.0
Principal payment dates			Mar. 13, 2029