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BALANCE SHEET COMPONENTS - Short-Term Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jan. 31, 2020
Jul. 31, 2019
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Refund term 12 months  
Due within one year $ 441,622  
Due in one to two years 165,685  
Total $ 607,307 $ 512,156