Schedule of Assets Measured at Fair Value On a Recurring Basis Using Significant Unobservable Inputs (level 3) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Fair Value Disclosures [Abstract]
Balance, beginning of period	$ 3,825	$ 3,619
Purchase of Rafael Holdings, Inc. warrant	354
Exercise of Rafael Holdings, Inc. warrant	(380)
Redemption for Visa mandatory release assessment	(1,870)
Total gains (losses) recognized in "Other income (expense), net"	536	206
Balance, end of period	2,465	3,825
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period