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Other Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2018
Jul. 31, 2017
Jan. 31, 2017
Oct. 31, 2017
Aug. 31, 2017
Dividend payment       $ 0.95  
Dividend aggregate amount to shareholders $ 16,657   $ 15,696    
Estimate of loss         $ 400
Selling, general and administrative [Member]          
Settlement expenses   $ 400