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BALANCE SHEET COMPONENTS - Short-Term Investments (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Jul. 31, 2018
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Due within one year $ 373,305  
Due in one to two years 122,328  
Total $ 495,633 $ 628,328