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NET LOSS AND UNAUDITED NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Earnings Per Share [Abstract]
Net loss	$ (87,369)	$ (85,674)	$ (62,631)	$ (61,487)	$ (66,132)	$ (96,835)	$ (76,369)	$ (140,302)	$ (297,161)	$ (379,638)	$ (108,233)
Weighted-average shares—basic and diluted (in shares)									164,091,302	128,295,563	43,970,381
Net loss per share attributable to common stockholders—basic and diluted (in dollars per share)	$ (0.51)	$ (0.51)	$ (0.39)	$ (0.39)	$ (0.43)	$ (0.67)	$ (0.54)	$ (1.89)	$ (1.81)	$ (2.96)	$ (2.46)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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