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Earnings per Share (Tables) | 3 Months Ended
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Aug. 31, 2012
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share | The following table sets forth the computation of basic and diluted earnings per share using the two-class method for amounts attributable to Cintas’ common shares:
| Three Months Ended
(In thousands except per share data) | August 31, 2012 |  | August 31, 2011
Basic Earnings per Share |  |  |  |  |
Net income | $ | 76,733 |  |  | $ | 68,638 |
Less: net income allocated to participating unvested securities | 365 |  |  | 370 |
Net income available to common shareholders | $ | 76,368 |  |  | $ | 68,268 |
Basic weighted average common shares outstanding | 126,110 |  |  | 131,309 |
Basic earnings per common share: | $ | 0.61 |  |  | $ | 0.52 |
Diluted Earnings per Share |  |  |  |  |
Net income | $ | 76,733 |  |  | $ | 68,638 |
Less: net income allocated to participating unvested securities | 365 |  |  | 370 |
Net income available to common shareholders | $ | 76,368 |  |  | $ | 68,268 |
Basic weighted average common shares outstanding | 126,110 |  |  | 131,309 |
Effect of dilutive securities – employee stock options | 348 |  |  | 29 |
Diluted weighted average common shares outstanding | 126,458 |  |  | 131,338 |
Diluted earnings per share: | $ | 0.60 |  |  | $ | 0.52 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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