Schedule of Components of Provision (Benefit) for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Taxes Provision Benefit Summary Of Income Taxes [Line Items]
Federal	$ 98,504	$ 83,374	$ 74,610
State and local	1,222	(1,383)	4,187
Total current expense	99,726	81,991	78,797
Federal	(7,785)	(3,805)	(7,712)
State and local	(1,055)	(883)	(789)
Total deferred (benefit)	(8,840)	(4,688)	(8,501)
Total income tax expense	$ 90,886	$ 77,303	$ 70,296