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Property and Equipment - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Property, Plant and Equipment [Abstract]        
Depreciation and amortization expense $ 3,900 $ 2,500 $ 7,508 $ 4,662