Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Income Tax [Line Items]
Provision for Income Taxes	$ 99,379,000	$ 8,274,000	$ 174,512,000	$ 77,771,000
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	13,100,000
Unremitted Foreign Earnings	347,500,000		347,500,000
Provision for deferred income taxes	106,200,000		106,200,000
Unrecognized tax benefits	12,900,000		12,900,000
Unrecognized tax benefits that would impact effective tax rate, if recognized	5,400,000		5,400,000
Net accrued interest and penalties related to unrecognized tax benefits	$ 3,800,000		$ 3,800,000