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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Aggregate amortization expense $ 2.5 $ 3.6 $ 8.0 $ 10.9