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NET LOSS PER SHARE - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Apr. 30, 2019
Apr. 30, 2018
Earnings Per Share [Abstract]                
Net loss $ (209,813) $ (122,763) $ (94,265) $ (85,674) $ (62,631) $ (61,487) $ (426,841) $ (209,792)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted (in shares) 182,962,921     166,845,544     179,235,498 161,709,365
Net loss per share attributable to common stockholders—basic and diluted (in dollars per share) $ (1.15)     $ (0.51)     $ (2.38) $ (1.30)