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Schedule of Carrying Value of Equity Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2022 | Apr. 30, 2021
Cash and Cash Equivalents [Abstract] |  |  |  |
Balance, beginning of period | $ 2,539 | $ 2,223 | $ 2,743 | $ 4,109
Redemption for Visa mandatory release assessment |  |  |  | (1,870)
Adjustment for observable transactions involving a similar investment from the same issuer | (130) | 404 | (334) | 388
Redemptions |  | (6) |  | (6)
Impairments |  |  |  |
Balance, end of the period | $ 2,409 | $ 2,621 | $ 2,409 | $ 2,621

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