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Intangibles, Net (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]      
Amortization expenses $ 6.8 $ 5.8 $ 6.8