Income Taxes (Income Before Provision for Income Taxes) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
U.S.	$ (73,153,000)	$ 7,226,000	$ 28,813,000
Foreign	(1,827,000)	2,084,000	97,000
(Loss) income before (benefit from) provision for income taxes	$ (74,980,000)	$ 9,310,000	$ 28,910,000