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Income Taxes (Narrative) (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 23.80% | 34.80% | 24.10% | 34.40%
Net diluted earnings per share related to employee stock-based compensation payments |  | $ 0.01 | $ 0.01 | $ 0.02
Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net diluted earnings per share related to employee stock-based compensation payments | $ 0.01 |  |  |

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