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Restructuring (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Restructuring and Related Activities [Abstract]    
Additional depreciation expense to be recorded for the fiscal year 2014 $ 2.8  
Additional depreciation expenses recognized during current period $ 1.7 $ 0.7
Data Centers
   
Property, Plant and Equipment [Line Items]    
Average useful lives of data center 60 months  
Revised average useful lives of data center 45 months