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Equity Investments (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Equity Securities, FV-NI, Gain (Loss) [Abstract]        
Net (losses) gains recognized during the period on equity investments $ (1,226) $ 623 $ (817) $ 704
Less: net gains and losses recognized during the period on equity investments redeemed during the period
Unrealized (losses) gains recognized during the period on equity investments still held at the reporting date $ (1,226) $ 623 $ (817) $ 704