CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (419,852)	$ (265,048)
Other comprehensive loss, net of tax:
Change in unrealized loss on available-for-sale securities, net of tax	(651)	(1,150)
Comprehensive loss	$ (420,503)	$ (266,198)