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Income Taxes (Details Textuals) (USD $)
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Income Tax Disclosure [Abstract]      
Valuation allowance $ 1,211,000 $ 948,000  
Unrecognized tax benefits that would impact effective tax rate 14,100,000 13,200,000  
Interest and penalties related to income tax 5,600,000 6,000,000 5,200,000
Recognized tax benefit 4,300,000 3,600,000 6,200,000
Retained earnings, undistributed earnings from equity method investees $ 58,800,000    
Federal statutory rate 35.00% 35.00% 35.00%