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Equity Investments (Details) - USD ($) $ in Thousands | Jul. 31, 2019 | Jul. 31, 2018
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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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