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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2015 | Nov. 30, 2014 | Nov. 30, 2015 | Nov. 30, 2014 | May. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate | 30.00% | 30.20% | 29.70% | 29.60% |
Federal statutory rate | 35.00% | 35.00% |  |  |
Undistributed foreign earnings | $ 401,500,000 |  | $ 401,500,000 |  | $ 419,100,000
Deferred income tax liability | 101,900,000 |  | 101,900,000 |  | $ 108,500,000
Provision for deferred income taxes | $ 0 |  | $ 0 |  |

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