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Restructuring (Detail Textuals) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Property, Plant and Equipment [Line Items]      
Additional depreciation expense $ 34.9 $ 37.0 $ 42.0
Data Centers      
Property, Plant and Equipment [Line Items]      
Useful life (in years)     60 months
Service Life | Data Centers      
Property, Plant and Equipment [Line Items]      
Useful life (in years)   45 months  
Additional depreciation expense   $ 2.8 $ 7.0