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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Assets at Fair Value: |  |  |
Unrealized Gain (Loss) on Investments | $ 6,326 | $ 6,621 | $ (16,940)
Limoneira [Member] |  |  |
Assets at Fair Value: |  |  |
Limoneira's stock price | $ 23.35 | $ 19.69 | $ 15.86
Unrealized Gain (Loss) on Investments | $ 3,900 | $ 4,100 | $ 10,300
Fair Value, Measurements, Recurring [Member] |  |  |
Assets at Fair Value: |  |  |
Total assets at fair value | 40,362 |  |
Fair Value, Measurements, Recurring [Member] | Limoneira [Member] |  |  |
Assets at Fair Value: |  |  |
Total assets at fair value | $ 40,362 |  |
Percentage of outstanding shares of Limoneira's shares owned | 12.00% |  |
Limoneira's stock price | $ 23.35 | $ 19.69 |
Unrealized Gain (Loss) on Investments | $ (6,300) | $ (6,600) | $ (16,900)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |
Assets at Fair Value: |  |  |
Total assets at fair value | 40,362 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Limoneira [Member] |  |  |
Assets at Fair Value: |  |  |
Total assets at fair value | $ 40,362 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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