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Other Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Dec. 08, 2015
Apr. 30, 2016
Apr. 30, 2015
Other Events [Abstract]      
Dividend payment $ 0.80    
Dividend aggregate amount to shareholders $ 13,900 $ 13,907 $ 12,970