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Equity Investments (Details) - Schedule of equity investments - USD ($)
$ in Thousands
Jul. 31, 2020
Jul. 31, 2019
Equity Investments (Details) - Schedule of equity investments [Line Items]    
Current equity investments $ 5,964 $ 5,688
Noncurrent equity investments 8,833 9,319
Mutual funds [Member]    
Equity Investments (Details) - Schedule of equity investments [Line Items]    
Current equity investments 5,516 5,053
Hedge funds [Member]    
Equity Investments (Details) - Schedule of equity investments [Line Items]    
Noncurrent equity investments 4,783 5,475
Other [Member]    
Equity Investments (Details) - Schedule of equity investments [Line Items]    
Noncurrent equity investments 225 225
Common Stock Class B [Member] | Zedge, Inc. [Member]    
Equity Investments (Details) - Schedule of equity investments [Line Items]    
Current equity investments 59 68
Common Stock Class B [Member] | Rafael Holdings, Inc [Member]    
Equity Investments (Details) - Schedule of equity investments [Line Items]    
Current equity investments 389 567
Visa Series C Preferred [Member]    
Equity Investments (Details) - Schedule of equity investments [Line Items]    
Noncurrent equity investments $ 3,825 $ 3,619