| Document and Entity Information | May 03, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | CINTAS CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0000723254 |
| Document Type | 8-K |
| Document Period End Date | May 3, 2022 |
| Entity Incorporation State Country Code | WA |
| Entity File Number | 0-11399 |
| Entity Tax Identification Number | 31-1188630 |
| Entity Address, Address Line One | 6800 Cintas Boulevard |
| Entity Address, Address Line Two | P.O. Box 625737 |
| Entity Address, City or Town | Cincinnati |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 45262-5737 |
| City Area Code | (513) |
| Local Phone Number | 459-1200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, no par value |
| Trading Symbol | CTAS |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
