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Fair Value Measurements - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2020 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Oct. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Proceeds from sale of stock in Calavo Growers, Inc. |  |  |  | $ 11,048 | $ 0 |
(Loss) gain on stock in Calavo Growers, Inc. |  | $ (4,275) | $ 3,612 | (6,299) | $ (298) |
Realized (loss) gain on stock in Calavo Growers, Inc. |  |  |  | $ (6,299) |  |
Calavo Growers, Inc. |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investment owned (in shares) |  |  |  |  |  | 200,000
Ownership percentage |  |  |  |  |  | 1.10%
Equity method investment investee, price per share (in dollars per share) |  |  |  |  |  | $ 97.00
Shares sold (in shares) | 200,000 |  |  |  |  | 50,000
Proceeds from sale of stock in Calavo Growers, Inc. | $ 11,048 |  |  |  |  | $ 4,786
Realized (loss) gain on stock in Calavo Growers, Inc. |  |  |  |  |  | $ (63)

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