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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Aggregate amortization expense $ 1.8 $ 2.2 $ 5.3 $ 7.0