Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Current
Federal	$ 57,511	$ 73,149	$ 54,427
State and local	2,731	3,537	4,109
Foreign	5,490	6,579	4,131
Current Income Tax Expense (Benefit), Total	65,732	83,265	62,667
Deferred
Federal	(37,839)	(25,453)	4,698
State and local	(754)	(1,194)	(2,170)
Foreign	(1,367)	731	(730)
Provision (benefit) for deferred income taxes	(39,960)	(25,916)	1,798
Income tax expense	$ 25,772	$ 57,349	$ 64,465