Schedule of Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Fair Value Disclosures [Abstract]
Balance, beginning of period	$ 2,319	$ 4,045	$ 3,825	$ 3,619
Purchase of Rafael Holdings, Inc. warrant			354
Exercise of Rafael Holdings, Inc. warrant	(380)		(380)
Redemption for Visa mandatory release assessment			(1,870)
Total gains (losses) recognized in "Other income (expense), net"	404	(412)	414	14
Balance, end of period	2,343	3,633	2,343	3,633
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period