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Cash dividend and declared dividends - (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Cash dividend and declared dividends        
Dividends paid, per share $ 0.02 $ 0.02 $ 0.02 $ 0.02
Dividends paid $ 187 $ 185 $ 560 $ 544