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Earnings per Share - Schedule of Buyback Activity by Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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May 31, 2025 | May 31, 2024 | May 31, 2023
Equity, Class of Treasury Stock [Line Items] |  |  |
Purchase Price | $ 934,800 | $ 700,033 | $ 398,865
Shares acquired for taxes due (in shares) | 1,297 | 1,325 | 1,719
Shares acquired for taxes due, average price (in dollars per share) | $ 196.87 | $ 139.34 | $ 105.05
Shares acquired for taxes due | $ 255,471 | $ 184,645 | $ 180,577
Total repurchase of Cintas common stock | $ 934,800 | $ 700,033 | $ 398,865
Share Repurchase Programs |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares (in shares) | 3,794 | 3,764 | 2,201
Average Price per Share (in dollars per share) | $ 179.07 | $ 136.92 | $ 99.17
Purchase Price | $ 679,329 | $ 515,388 | $ 218,288
Share Buyback Program July 27 2021 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares (in shares) | 0 | 3,425 | 2,201
Average Price per Share (in dollars per share) | $ 0 | $ 133.80 | $ 99.17
Purchase Price | $ 0 | $ 458,284 | $ 218,288
Share Buyback Program July 26 2022 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares (in shares) | 3,794 | 339 | 0
Average Price per Share (in dollars per share) | $ 179.07 | $ 168.44 | $ 0
Purchase Price | $ 679,329 | $ 57,104 | $ 0
Share Buyback Program July 23 2024 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares (in shares) | 0 | 0 | 0
Average Price per Share (in dollars per share) | $ 0 | $ 0 | $ 0
Purchase Price | $ 0 | $ 0 | $ 0

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- Definition Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
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