Schedule of Changes in Unrecognized Tax Benefit (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Schedule of Unrecognized Tax Benefits [Line Items]
Beginning balance	$ 32,733	$ 33,900	$ 32,174
Tax positions related to prior years: Additions	9	436	562
Tax positions related to prior years: Reductions	(9,281)	(113)	(284)
Tax positions related to current year: Additions	3,804	5,348	3,995
Settlements	(5,002)	(5,593)	(1,364)
Lapses in statute of limitations	(1,450)	(1,245)	(1,183)
Ending balance	$ 20,813	$ 32,733	$ 33,900