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Equity Investments (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jul. 31, 2019
Equity Securities without Readily Determinable Fair Value [Line Items]
Current "Equity investments"	$ 5,710	$ 5,688
Noncurrent "Equity investments"	9,337	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"	5,160	5,053
Hedge Funds [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent "Equity investments"	5,475	5,475
Visa Series C Preferred [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent "Equity investments"	3,637	3,619
Zedge, Inc. [Member] | Common Class B
Equity Securities without Readily Determinable Fair Value [Line Items]
Current "Equity investments"	74	68
Rafael Holdings, Inc [Member] | Common Class B
Equity Securities without Readily Determinable Fair Value [Line Items]
Current "Equity investments"	$ 476	$ 567

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