BALANCE SHEET COMPONENTS - Other Assets Noncurrent (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2019	Jul. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Other tax assets—non-current	$ 0	$ 30,927
Deferred tax assets—non-current	3,064	2,860
Other	9,756	4,068
Total other assets—non-current	$ 12,820	$ 37,855
Refund term	12 months
Income taxes receivable	$ 18,000