Schedule of Equity Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020
EquityInvestmentsDisclosureLineItem [Line Items]
Equity Securities, FV-NI, Current	$ 42,434	$ 5,964
Long-term Investments	11,654	8,833
Other Marketable Equity Securities [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Equity Securities, FV-NI, Current	3,630
Mutual Fund [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Equity Securities, FV-NI, Current	23,467	5,516
Hedge Funds [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Long-term Investments	3,563	4,783
Other Investments [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Long-term Investments	2,725	225
Common Class B [Member] | Zedge Inc [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Equity Securities, FV-NI, Current	649	59
Common Class B [Member] | Rafael Holdings Inc. [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Equity Securities, FV-NI, Current	12,479	389
Restricted Common Class B [Member] | Rafael Holdings Inc. [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Equity Securities, FV-NI, Current	2,209
Series C Preferred Stock [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Long-term Investments	2,465	3,825
Series B Convertible Preferred Stock [Member]
EquityInvestmentsDisclosureLineItem [Line Items]
Long-term Investments	$ 2,901