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BALANCE SHEET COMPONENTS - Accrued Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2019
Jul. 31, 2018
Other Liabilities Disclosure [Abstract]    
Accrued professional services $ 2,593 $ 5,838
Income taxes payable 2,901 20,863
Other 14,525 4,981
Total accrued expenses and other current liabilities 20,019 $ 31,682
Income taxes paid $ 18,000