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Income Taxes (Narrative) (Details) - $ / shares | 3 Months Ended | 9 Months Ended
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Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2017 | Feb. 29, 2016
Income Taxes [Abstract] |  |  |  |
Effective income tax rate | 34.20% | 36.00% | 34.10% | 33.90%
Diluted earnings per share impact of discrete tax benefit | $ 0.01 |  | $ 0.05 | $ 0.06

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