Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Current
Federal	$ 42,837	$ 57,511	$ 73,149
State and local	2,157	2,731	3,537
Foreign	6,639	5,490	6,579
Current Income Tax Expense (Benefit), Total	51,633	65,732	83,265
Deferred
Federal	7,584	(37,839)	(25,453)
State and local	934	(754)	(1,194)
Foreign	(1,164)	(1,367)	731
Provision for (benefit from) deferred income taxes	7,354	(39,960)	(25,916)
Income tax expense	$ 58,987	$ 25,772	$ 57,349