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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Earnings Per Share [Abstract]        
Net income attributable to parent $ 9,689 $ 8,472 $ 16,038 $ 13,771
Weighted average shares - Basic 17,348,144 17,300,317 17,335,042 17,297,686
Effect on dilutive securities - Restricted stock/options 97,301 82,462 80,376 45,657
Weighted average shares - Diluted 17,445,445 17,382,779 17,415,418 17,343,343
Basic $ 0.56 $ 0.49 $ 0.93 $ 0.80
Diluted $ 0.56 $ 0.49 $ 0.92 $ 0.79