Schedule of Changes in Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Schedule of Unrecognized Tax Benefits [Line Items]
Beginning balance	$ 13,156	$ 20,813	$ 32,733
Tax positions related to prior years: Additions	1,546	126	9
Tax positions related to prior years: Reductions	(920)	(7,695)	(9,281)
Tax positions related to current year: Additions	3,123	2,858	3,804
Settlements	(956)	(1,898)	(5,002)
Lapses in statute of limitations	(2,680)	(1,048)	(1,450)
Ending balance	$ 13,269	$ 13,156	$ 20,813