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FINANCIAL INSTRUMENTS, FAIR VALUE AND RISK MANAGEMENT - Foreign Exchange Risk Narrative (Details)
€ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Oct. 31, 2016
USD ($)
Apr. 30, 2017
EUR (€)
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Cumulative unrealized exchange gains $ 0.2 $ 0.1  
Foreign credit agreement      
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Long-term debt, including current portion, carrying value | €     € 463.1
Cumulative unrealized exchange gains $ 74.7    
Canada      
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Potential increase/decrease in exchange rate impacting operating income, percentage 10.00%    
Potential increase/decrease in exchange rate impacting operating income, value $ 5.8    
Percent of cash flow exposures covered by hedges     68.00%
Geographic Concentration Risk | Canada | Cash receipts from operations in U.S. dollars      
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Concentration risk, percentage (as percent) 90.00%    
Geographic Concentration Risk | Canada | Cash outflows in U.S. dollars      
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]      
Concentration risk, percentage (as percent) 15.00%