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BALANCE SHEET COMPONENTS - Short-Term Investments (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Jul. 31, 2020
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Due within one year $ 631,457  
Due in one to two years 182,146  
Total $ 813,603 $ 401,041