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Schedule of Unrealized (losses) Gains for All 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 Unrealized Losses Gains For All Equity Investments        
Net gains (losses) recognized during the period on equity investments $ 5,435 $ (1,226) $ 5,822 $ (817)
Less: net gains and losses recognized during the period on equity investments sold during the period
Unrealized gains (losses) recognized during the period on equity investments still held at the reporting date $ 5,435 $ (1,226) $ 5,822 $ (817)