Schedule of Equity Investments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Apr. 30, 2021	Jul. 31, 2020
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Current equity investments	$ 37,586	$ 5,964
Noncurrent equity investments	14,922	8,833
Other Marketable Equity Securities [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Current equity investments	1,956
Mutual Fund [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Current equity investments	23,070	5,516
Hedge Funds [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Noncurrent equity investments	3,462	4,783
Other Investments [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Noncurrent equity investments	2,725	225
Common Class B [Member] | Zedge Inc [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Current equity investments	$ 562	$ 59
Number of related party shares received	42,282	42,282
Common Class B [Member] | Rafael Holdings Inc. [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Current equity investments	$ 1,171	$ 389
Number of related party shares received	28,320	27,806
Restricted Common Class B [Member] | Rafael Holdings Inc. [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Current equity investments	$ 10,827
Number of related party shares received	261,894
Series C Preferred Stock [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Noncurrent equity investments	$ 2,343	3,825
Series A Preferred Stock [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Noncurrent equity investments	2,920
Series B Convertible Preferred Stock [Member]
EquityInvestmentsDetailsScheduleOfEquityInvestmentsLineItemsLineItems [Line Items]
Noncurrent equity investments	$ 3,472