Equity Investments (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Net gains recognized during the period on equity investments	$ 383	$ 128	$ 409	$ 81
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	$ 383	$ 128	$ 409	$ 81