Schedule of Unrealized (losses) Gains for All Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Cash and Cash Equivalents [Abstract]
Net (losses) gains recognized during the period on equity investments	$ (2,952)	$ 1,307	$ (17,446)	$ 387
Less: net gains recognized during the period on equity investments sold during the period	25		10
Unrealized (losses) gains recognized during the period on equity investments still held at the reporting date	$ (2,977)	$ 1,307	$ (17,456)	$ 387