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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016
Income Tax Disclosure [Abstract] |  |
Effective income tax rate | 24.70% | 23.60%
Federal statutory rate | 35.00% | 35.00%
Favorable discrete tax adjustments for excess tax benefits related to equity compensation | $ 1,500,000 | $ 10,400,000
Discrete tax expense (benefit) | (9,000,000) |
Discrete tax charge related to intercompany distribution | 7,300,000 |
Discrete tax benefit related to change in estimated deferred income tax liability | 16,300,000 |
Unremitted foreign earnings | 290,400,000 |
Deferred income tax liability | 85,400,000 |
Reduction to deferred tax liability offset by increase due to foreign currency translation | 7,600,000 |
Provision for deferred income taxes | $ 0 |

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