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Balance sheet Components (Other Assets) (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Jul. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Prepaid expenses $ 2,830 $ 2,640
Noncurrent contract cost 25,221 23,375
Deferred costs 5,729 8,867
Strategic investments 1,164 10,672
Other assets $ 34,944 $ 45,554