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Goodwill and Intangible Assets (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Goodwill [Abstract]        
Aggregate amortization expense $ 1.2 $ 1.1 $ 2.3 $ 2.2