Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Federal:
Current	$ 109,804	$ 12,752	$ 103,127
Deferred	17,094	20,094	7,019
Federal Income Tax Expense (Benefit), Continuing Operations	126,898	32,846	110,146
State:
Current	9,100	1,659	5,347
Deferred	(111)	499	151
State and Local Income Tax Expense (Benefit), Continuing Operations	8,989	2,158	5,498
International:
Current	8,820	11,468	10,855
Deferred	(203)	(633)	(994)
International Income Tax Expense (Benefit), Continuing Operations	8,617	10,835	9,861
Income tax expense (benefit), total	$ 144,504	$ 45,839	$ 125,505