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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 29, 2016 | Feb. 28, 2015 | Feb. 29, 2016 | Feb. 28, 2015 | May. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |
Provision for income tax | $ 2,613,000 | $ 99,379,000 | $ 80,564,000 | $ 174,512,000 |
Federal statutory rate | 35.00% | 35.00% | 35.00% | 35.00% |
Net discrete tax benefits primarily comprised of reversal of deferred tax asset valuation allowances and adjustments to tax contingency reserves | $ 3,900,000 | $ 13,100,000 |  |  |
Provision for deferred income taxes | 0 | 106,200,000 | $ 0 | $ 106,200,000 |
Undistributed foreign earnings | 356,500,000 | $ 347,500,000 | 356,500,000 | $ 347,500,000 | $ 419,100,000
Deferred income tax liability | $ 91,600,000 |  | $ 91,600,000 |  | $ 108,500,000

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