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BALANCE SHEET COMPONENTS - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Jul. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Income taxes payable $ 20,863 $ 3,873
Accrued professional services 5,838 4,167
Other 4,981 1,667
Total accrued expenses and other current liabilities $ 31,682 $ 9,707