Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Income Tax Disclosure [Abstract]
Federal	$ 48,757	$ 166,402	$ 200,370
State and local	5,921	21,025	20,941
Foreign	6,611
Total current expense	61,289	187,427	221,311
Federal	10,862	17,820	(37,033)
State and local	(36)	(2,369)	(2,146)
Foreign	(19,914)
Total deferred expense (benefit)	(9,088)	15,451	(39,179)
Total income tax expense	$ 52,201	$ 202,878	$ 182,132