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Equity Investments (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Equity Securities, FV-NI, Gain (Loss) [Abstract]        
Net gains recognized during the period on equity investments $ 623 $ 30 $ 704 $ 53
Less: net gains and losses recognized during the period on equity investments redeemed during the period
Unrealized gains recognized during the period on equity investments still held at the reporting date $ 623 $ 30 $ 704 $ 53