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Income Taxes and Other Taxes (Details) | 3 Months Ended | 12 Months Ended
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Aug. 31, 2015 | May. 31, 2015
Income Tax And Non Income Tax Disclosure [Abstract] |  |
Effective Income Tax Rate, Annualized, Percent |  | 40.00%
Effective Income Tax Rate Reconciliation, Percent | 38.60% |

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