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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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Quoted market price per share of equity method investee shares.

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Investments, Equity Securities, Number Of Shares Sold

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Balance held at close of period in number of shares.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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