| Document And Entity Information | Sep. 30, 2021 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 30, 2021 |
| Entity Registrant Name | PAYCHEX, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 0-11330 |
| 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 |
| 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 |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000723531 |
| Amendment Flag | false |
