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Equity Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019
Equity Securities without Readily Determinable Fair Value [Line Items]
Current equity investments	$ 5,716	$ 5,688
Noncurrent equity investments	8,569	9,319
Other [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent equity investments	225	225
Mutual funds [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Current equity investments	5,282	5,053
Hedge Funds [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent equity investments	4,711	5,475
Visa Series C Preferred [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent equity investments	3,633	3,619
Zedge, Inc. [Member] | Common Stock Class B [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Current equity investments	47	68
Rafael Holdings, Inc [Member] | Common Stock Class B [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Current equity investments	$ 387	$ 567

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