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Income Tax - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Current tax expense:      
Federal $ 25,022 $ 49,178 $ 16,326
State 3,905 3,856 987
Foreign (10,346) 48,075 36,020
Current tax expense 18,581 101,109 53,333
Deferred income tax expense:      
Federal 14,822 1,568 26,302
State 3,606 1,206 3,568
Foreign 70,986 3,515 12,368
Deferred tax expense 89,414 6,289 42,238
Provision for income taxes $ 107,995 $ 107,398 $ 95,571