Income Taxes (Components Of Provision (Benefit) For Income Taxes) (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Income Taxes
Current federal	$ (9,886)	$ 19,661	$ (242)
Current state	(1,210)	2,788	119
Total current	(11,096)	22,449	(123)
Deferred federal	28,087	(3,989)	27,358
Deferred state	4,107	(438)	3,409
Total deferred	32,194	(4,427)	30,767
Provision for income taxes	$ 21,098	$ 18,022	$ 30,644