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Balance Sheet Components (Details 7) - USD ($)
$ in Thousands
Apr. 30, 2020
Jul. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Prepaid expenses $ 2,753 $ 2,640
Contract costs 22,389 23,375
Deferred costs 6,541 8,867
Strategic investment 0 10,672
Other assets $ 31,683 $ 45,554