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Other Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 08, 2016
Jul. 31, 2017
Jul. 31, 2017
Jul. 31, 2016
Aug. 31, 2017
Dividend payment $ 0.90        
Dividend aggregate amount to shareholders     $ 15,696 $ 13,907  
Estimate of loss         $ 400
Selling, General and Administrative Expenses          
Settlement expenses   $ 400