Income Taxes (Details) (USD $)	3 Months Ended
	Oct. 31, 2011	Jul. 31, 2011
Income Taxes [Abstract]
Total unrecognized tax benefits, excluding interests - Ending and beginning balances	$ 3,336,000	$ 6,763,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	2,737,000	5,719,000
Income taxes payable non-current	3,096,000	3,811,000
Net discrete tax benefit relating to effective settlement of certain federal and state income tax audits	3,430,000
Interest accrued relating to income taxes, net of the related income tax benefit	$ 117,000	$ 545,000
Income Tax effective tax rate, Continuing Operations	10.70%
Income Tax effective tax rate, Continuing Operations, excluding discrete adjustments	35.00%