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Income Taxes (Narrative) (Details) - $ / shares | 3 Months Ended | 6 Months Ended
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Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015
Income Taxes [Abstract] |  |  |  |
Effective income tax rate | 35.20% | 36.00% | 34.10% | 32.90%
Diluted earnings per share impact of discrete tax benefit |  |  | $ 0.04 |

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