Income Taxes (Components Of Provision (Benefit) For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Current federal	$ (43,366)	$ 55,887	$ 70,553
Current state	9,562	8,096	10,555
Current Foreign Tax Expense (Benefit)	18,436	16,311	4,431
Total current	(15,368)	80,294	85,539
Deferred federal	(45,922)	29,065	7,603
Deferred state	2,941	3,601	1,051
Deferred Foreign Income Tax Expense (Benefit)	(2,789)	3,771	(1,028)
Deferred Income Tax Expense (Benefit)	(45,770)	36,437	7,626
Provision for income taxes	$ (61,138)	$ 116,731	$ 93,165