Equity Investments (Details) - Schedule of unrealized (losses) gains for all equity investments - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Schedule of unrealized (losses) gains for all equity investments [Abstract]
Net (losses) gains recognized during the period on equity investments	$ (920)	$ 26
Less: net gains and losses recognized during the period on equity investments sold during the period
Unrealized (losses) gains recognized during the period on equity investments still held at the reporting date	$ (920)	$ 26