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Goodwill and Intangible Assets (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Goodwill [Abstract]        
Aggregate amortization expense $ 1.7us-gaap_AmortizationOfIntangibleAssets $ 1.2us-gaap_AmortizationOfIntangibleAssets $ 3.6us-gaap_AmortizationOfIntangibleAssets $ 2.3us-gaap_AmortizationOfIntangibleAssets