Schedule of Components of Provision (Benefit) for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Income Taxes Provision Benefit Summary Of Income Taxes [Line Items]
Federal	$ 126,846	$ 98,504	$ 83,374
State and local	12,716	1,222	(1,383)
Total current expense	139,562	99,726	81,991
Federal	(13,079)	(7,785)	(3,805)
State and local	(1,192)	(1,055)	(883)
Total deferred (benefit)	(14,271)	(8,840)	(4,688)
Total income tax expense	$ 125,291	$ 90,886	$ 77,303