Income Taxes (Components Of Provision (Benefit) For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Income Tax Disclosure [Abstract]
Current federal	$ 1,407	$ (9,886)	$ 19,661
Current state	51	(1,210)	2,788
Total current	1,458	(11,096)	22,449
Deferred federal	7,682	28,087	(3,989)
Deferred state	1,561	4,107	(438)
Deferred Income Tax Expense (Benefit)	9,243	32,194	(4,427)
Provision for income taxes	$ 10,701	$ 21,098	$ 18,022