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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (29,154)	$ (3,555)	$ (46,230)	$ (11,143)
Other comprehensive income, net of tax:
Unrealized net gains on available-for-sale securities	55	258	223	65
Other comprehensive income	55	258	223	65
Comprehensive loss	$ (29,099)	$ (3,297)	$ (46,007)	$ (11,078)

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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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