Schedule of Changes in Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Schedule of Unrecognized Tax Benefits [Line Items]
Beginning balance	$ 20,813	$ 32,733	$ 33,900
Tax positions related to prior years: Additions	126	9	436
Tax positions related to prior years: Reductions	(7,695)	(9,281)	(113)
Tax positions related to current year: Additions	2,858	3,804	5,348
Settlements	(1,898)	(5,002)	(5,593)
Lapses in statute of limitations	(1,048)	(1,450)	(1,245)
Ending balance	$ 13,156	$ 20,813	$ 32,733