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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Oct. 31, 2015
Limoneira          
Assets at Fair Value:          
Percentage of outstanding shares of Limoneira's shares owned 12.00%   12.00%    
Limoneira's stock price $ 17.69   $ 17.69   $ 15.86
Unrealized investment holding income (losses) $ 300 $ 4,100 $ 3,200 $ 8,800  
Fair Value, Measurements, Recurring [Member]          
Assets at Fair Value:          
Total assets at fair value 30,578   30,578    
Fair Value, Measurements, Recurring [Member] | Limoneira          
Assets at Fair Value:          
Total assets at fair value 30,578   30,578    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]          
Assets at Fair Value:          
Total assets at fair value 30,578   30,578    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Limoneira          
Assets at Fair Value:          
Total assets at fair value $ 30,578   $ 30,578