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Equity Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Equity Securities without Readily Determinable Fair Value [Line Items]
Current "Equity investments"	$ 5,688	$ 360
Noncurrent "Equity investments"	9,319	6,633
Other [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent "Equity investments"	225	266
Hedge Funds [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent "Equity investments"	5,475	4,787
Mutual funds [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Current "Equity investments"	5,053
Visa Series C Preferred [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Noncurrent "Equity investments"	3,619	1,580
Zedge Inc [Member] | Common Class B [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Current "Equity investments"	68	125
Rafael Spin Off [Member] | Common Class B [Member]
Equity Securities without Readily Determinable Fair Value [Line Items]
Current "Equity investments"	$ 567	$ 235

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