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Stock-Based Compensation (Tables) | 12 Months Ended
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May 31, 2025
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Assumptions Used to Determine Fair Value of Options | The fair value of options was estimated at the date of grant using a Black-Scholes option-pricing model with the following assumptions for the fiscal years ended May 31:
| 2025 |  | 2024 |  | 2023
Risk-free interest rate | 4.3% |  | 3.9% |  | 2.8%
Dividend yield | 1.1% |  | 1.1% |  | 1.1%
Expected volatility of Cintas' common stock | 26.5% |  | 26.9% |  | 26.0%
Expected life of the option in years | 5.5 |  | 5.5 |  | 5.5
Schedule of Stock Options Granted and Outstanding | The information presented in the following table relates primarily to stock options granted and outstanding under either the 2016 Plan or under previously adopted plans:
| Shares |  | Weighted Average Exercise Price
Outstanding, June 1, 2022 (6,303,996 shares exercisable) | 20,349,608 |  |  | $ | 57.66 |
Granted | 2,316,584 |  |  | 116.23 |
Canceled | (6,840) |  |  | 16.45 |
Forfeited | (650,392) |  |  | 84.87 |
Exercised | (4,297,952) |  |  | 36.30 |
Outstanding, May 31, 2023 (6,185,384 shares exercisable) | 17,711,008 |  |  | 69.50 |
Granted | 1,633,988 |  |  | 165.58 |
Canceled | — |  |  | — |
Forfeited | (442,372) |  |  | 102.84 |
Exercised | (3,653,592) |  |  | 42.91 |
Outstanding, May 31, 2024 (5,543,968 shares exercisable) | 15,249,032 |  |  | 85.73 |
Granted | 1,050,217 |  |  | 222.76 |
Canceled | — |  |  | — |
Forfeited | (622,472) |  |  | 142.77 |
Exercised | (2,998,290) |  |  | 53.30 |
Outstanding, May 31, 2025 (4,870,890 shares exercisable) | 12,678,487 |  |  | $ | 103.72 |
Schedule of Information Related to Stock Options Outstanding | The following table summarizes the information related to stock options outstanding at May 31, 2025:
|  |  | Outstanding Options |  | Exercisable Options
Range of Exercise Prices | Number Outstanding |  | Average Remaining Option Life |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$21.22 - $65.20 | 3,590,241 |  | 2.98 |  | $ | 48.20 |  |  | 3,590,241 |  |  | $ | 48.20 |
$65.21 - $97.22 | 3,315,369 |  | 5.81 |  | 88.27 |  |  | 1,180,993 |  |  | 82.84 |
$97.23 - $122.54 | 3,469,620 |  | 7.66 |  | 111.53 |  |  | 78,700 |  |  | 104.09 |
$122.55 - $226.50 | 2,303,257 |  | 9.47 |  | 200.75 |  |  | 20,956 |  |  | 129.13 |
$21.22 - $226.50 | 12,678,487 |  | 6.18 |  | $ | 103.72 |  |  | 4,870,890 |  |  | $ | 57.85 |
Schedule of Restricted Stock Awards Granted and Outstanding | The information presented in the following table relates to restricted stock awards granted and outstanding under either the Amended 2016 Plan or under previously adopted plans:
| Shares |  | Weighted Average Grant Price
Outstanding, unvested grants at June 1, 2022 | 3,346,436 |  |  | $ | 82.99 |
Granted | 751,000 |  |  | 117.53 |
Forfeited | (204,800) |  |  | 96.15 |
Vested | (1,146,116) |  |  | 66.91 |
Outstanding, unvested grants at May 31, 2023 | 2,746,520 |  |  | 98.01 |
Granted | 692,776 |  |  | 168.39 |
Forfeited | (179,352) |  |  | 108.20 |
Vested | (647,840) |  |  | 75.46 |
Outstanding, unvested grants at May 31, 2024 | 2,612,104 |  |  | 122.58 |
Granted | 428,098 |  |  | 224.94 |
Forfeited | (163,748) |  |  | 158.26 |
Vested | (839,453) |  |  | 100.95 |
Outstanding, unvested grants at May 31, 2025 | 2,037,001 |  |  | $ | 155.77 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 50 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718-50/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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