Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense	$ 1.5	$ 1.7	$ 3.0	$ 3.6