Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (419,852)	$ (265,048)
Weighted average shares—basic and diluted	215,499	203,095
Net loss per share attributable to common stockholders— basic and diluted	$ (1.95)	$ (1.31)