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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jan. 31, 2020 | Jul. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities | $ 8,750 | $ 2,534 |
Equity investments included in current assets | 5,890 | 5,688 |
Equity investments included in noncurrent assets | 4,045 | 3,619 |
Total | 18,685 | 11,841 |
Fair Value Measurements, Recurring basis [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities |  |  | [1]
Equity investments included in current assets | 5,890 | 5,688 | [1]
Equity investments included in noncurrent assets |  |  | [1]
Total | 5,890 | 5,688 | [1]
Fair Value Measurements, Recurring basis [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities | 8,750 | 2,534 | [2]
Equity investments included in current assets |  |  | [2]
Equity investments included in noncurrent assets |  |  | [2]
Total | 8,750 | 2,534 | [2]
Fair Value Measurements, Recurring basis [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities |  |  | [3]
Equity investments included in current assets |  |  | [3]
Equity investments included in noncurrent assets | 4,045 | 3,619 | [3]
Total | $ 4,045 | $ 3,619 | [3]
[1] | quoted prices in active markets for identical assets or liabilities
[2] | observable inputs other than quoted prices in active markets for identical assets and liabilities
[3] | no observable pricing inputs in the market

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