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Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 08, 2016
Dec. 08, 2015
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Dividend payment   $ 0.80      
Dividend aggregate amount to shareholders   $ 13,900 $ 13,907 $ 12,971 $ 11,005
Subsequent Event          
Dividend payment $ 0.90        
Dividend aggregate amount to shareholders $ 15,700