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Goodwill and Acquired Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of acquired intangible assets $ 600 $ 100 $ 1,421 $ 239