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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (51,276)	$ (20,190)
Foreign currency translation adjustments	(724)	(694)
Unrealized gains (losses) on available-for-sale securities	(1,118)	(1,839)
Tax benefit (expense) on unrealized gains (losses) on available-for-sale securities	251	359
Reclassification adjustment for realized gains (losses) included in net income (loss)	69	347
Total other comprehensive income (loss)	(1,522)	(1,827)
Comprehensive income (loss)	$ (52,798)	$ (22,017)

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