Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Federal:
Current	$ 12,752	$ 103,127	$ 95,468
Deferred	20,094	7,019	5,841
Federal Income Tax Expense (Benefit), Continuing Operations	32,846	110,146	101,309
State:
Current	1,659	5,347	1,160
Deferred	499	151	(86)
State and Local Income Tax Expense (Benefit), Continuing Operations	2,158	5,498	1,074
International:
Current	11,468	10,855	11,062
Deferred	(633)	(994)	(1,159)
International Income Tax Expense (Benefit), Continuing Operations	10,835	9,861	9,903
Income tax expense (benefit), total	$ 45,839	$ 125,505	$ 112,286