Equity Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019
Equity Securities without Readily Determinable Fair Value [Line Items]
Current equity investments	$ 5,890	$ 5,688
Noncurrent equity investments	9,592	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	5,263	5,053
Hedge Funds [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent equity investments	5,322	5,475
Visa Series C Preferred [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent equity investments	4,045	3,619
Zedge, Inc. [Member] | Common Class B
Equity Securities without Readily Determinable Fair Value [Line Items]
Current equity investments	72	68
Rafael Holdings, Inc [Member] | Common Class B
Equity Securities without Readily Determinable Fair Value [Line Items]
Current equity investments	$ 555	$ 567