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Earnings Per Share - Schedule of Buyback Activity by Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 38 Months Ended
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Jan. 07, 2026 | Feb. 28, 2026 | Nov. 30, 2025 | Aug. 31, 2025 | Feb. 28, 2025 | Nov. 30, 2024 | Aug. 31, 2024 | Feb. 28, 2026 | Feb. 28, 2025 | Sep. 30, 2025
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares acquired for taxes due (in shares) |  | 145 |  |  | 134 |  |  | 753 | 1,052 |
Shares acquired for taxes due, average price (in dollars per share) |  | $ 192.95 |  |  | $ 197.89 |  |  | $ 213.57 | $ 194.31 |
Shares acquired for taxes due |  | $ 27,845 |  |  | $ 26,611 |  |  | $ 160,739 | $ 204,512 |
Total repurchase of Cintas common stock |  | $ 31,560 | $ 635,570 | $ 266,097 | $ 26,611 | $ 36,716 | $ 614,802 | $ 933,227 | $ 678,129 |
Share Buyback Programs |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares (in shares) |  | 20 |  |  | 0 |  |  | 3,960 | 2,732 |
Average Price per Share (in dollars per share) |  | $ 183.00 |  |  | $ 0 |  |  | $ 195.04 | $ 173.40 |
Purchase Price |  | $ 3,715 |  |  | $ 0 |  |  | $ 772,488 | $ 473,617 |
July 26, 2022 Plan |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares (in shares) |  | 0 |  |  | 0 |  |  | 1,272 | 2,732 | 5,400
Average Price per Share (in dollars per share) |  | $ 0 |  |  | $ 0 |  |  | $ 207.13 | $ 173.40 | $ 185.01
Purchase Price |  | $ 0 |  |  | $ 0 |  |  | $ 263,564 | $ 473,617 | $ 1,000,000
July 23, 2024 Plan |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares (in shares) |  | 20 |  |  | 0 |  |  | 2,688 | 0 |
Average Price per Share (in dollars per share) |  | $ 183.00 |  |  | $ 0 |  |  | $ 189.32 | $ 0 |
Purchase Price |  | $ 3,715 |  |  | $ 0 |  |  | $ 508,924 | $ 0 |
October 28, 2025 Plan |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares (in shares) | 0 | 0 |  |  |  |  |  | 0 |  |
Average Price per Share (in dollars per share) |  | $ 0 |  |  |  |  |  | $ 0 |  |
Purchase Price |  | $ 0 |  |  |  |  |  | $ 0 |  |

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