Equity Investments (Details 1) - Equity Method Investments [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Equity Securities without Readily Determinable Fair Value [Line Items]
Balance, beginning of period	$ 3,937	$ 3,118	$ 3,919	$ 1,883
Adoption of change in accounting for equity investments				1,213
Adjusted balance	3,937	3,118	3,919	3,096
Adjustment for observable transactions involving a similar investment from the same issuer	408	(71)	426	(49)
Redemptions		(2)		(2)
Impairments
Balance, end of the period	$ 4,345	$ 3,045	$ 4,345	$ 3,045