Income Taxes (Components Of Provision (Benefit) For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Income Tax Disclosure [Abstract]
Current federal	$ 25,753	$ 1,407	$ (9,886)
Current state	3,991	51	(1,210)
Total current	29,744	1,458	(11,096)
Deferred federal	(7,175)	7,682	28,087
Deferred state	(950)	1,561	4,107
Deferred Income Tax Expense (Benefit)	(8,125)	9,243	32,194
Provision for income taxes	$ 21,619	$ 10,701	$ 21,098