| Document And Entity Information | Jun. 29, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 29, 2022 |
| Entity Registrant Name | Paychex, Inc. |
| Entity Central Index Key | 0000723531 |
| Entity Emerging Growth Company | false |
| Entity File Number | 01-11330 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 16-1124166 |
| Entity Address, Address Line One | 911 Panorama Trail South |
| Entity Address, City or Town | Rochester |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 14625-2396 |
| City Area Code | (585) |
| Local Phone Number | 385-6666 |
| Entity Information, Former Legal or Registered Name | N/A |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | PAYX |
| Security Exchange Name | NASDAQ |
