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Subsequent Events - Narrative (Details)
12 Months Ended
Dec. 20, 2017
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Subsequent Event [Line Items]        
U.S. statutory rate   35.00% 35.00% 35.00%
Subsequent Event        
Subsequent Event [Line Items]        
U.S. statutory rate 21.00%