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Property and Equipment, Net (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 34.8 $ 40.2 $ 39.0
Software
     
Property, Plant and Equipment [Line Items]      
Amortization expense $ 8.9 $ 0.8 $ 0.3