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Income Taxes (Details) (USD $)
6 Months Ended
Jan. 31, 2012
Jul. 31, 2011
Income Taxes [Abstract]    
Income Tax effective tax rate, Continuing Operations 20.00%  
Net discrete tax benefit relating to effective settlement of certain federal and state income tax audits $ 3,463,000  
Income Tax effective tax rate, Continuing Operations, excluding discrete adjustments 35.00%  
Total unrecognized tax benefits, excluding interests - Ending and beginning balances 3,454,000 6,763,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized 2,791,000 5,719,000
Income taxes payable non-current 3,235,000 3,811,000
Interest accrued relating to income taxes, net of the related income tax benefit $ 133,000 $ 545,000