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Fair Value Measurements - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on stock		$ (2,024)	$ (3,910)
Calavo Growers, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment owned (in shares)		20,000		200,000
Ownership percentage		1.10%		1.10%
Shares sold (in shares)	50,000
Proceeds from sale of stock in Calavo Growers, Inc.	$ 4,786
Loss on sale of stock in Calavo Growers, Inc.				$ 63
Equity method investment investee, price per share (in dollars per share)		$ 76.61		$ 86.73

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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 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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Amount of unrealized 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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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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