Schedule of Carrying Value of Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Schedule Of Carrying Value Of Equity Investments
Balance, beginning of period	$ 2,223	$ 4,345	$ 4,109	$ 3,919
Redemption for Visa mandatory release assessment			(1,870)
Adjustment for observable transactions involving a similar investment from the same issuer	404	(412)	388	14
Redemptions	(6)		(6)
Impairments
Balance, end of the period	$ 2,621	$ 3,933	$ 2,621	$ 3,933