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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (265,048)	$ (229,300)
Other comprehensive loss, net of tax:
Change in unrealized gain (loss) on available-for-sale securities, net of tax	(1,150)	565
Comprehensive loss	$ (266,198)	$ (228,735)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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