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Equity Investments (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Equity Investments [Abstract]        
Balance, beginning of period $ 4,345 $ 3,045 $ 3,919 $ 1,883
Adoption of change in accounting for equity investments 1,213
Adjusted balance 4,345 3,045 3,919 3,096
Adjustment for observable transactions involving a similar investment from the same issuer (412) 599 14 550
Redemptions (2)
Impairments
Balance, end of the period $ 3,933 $ 3,644 $ 3,933 $ 3,644