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EMPLOYEE BENEFITS OBLIGATIONS (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2018
CAD ($)
funded_defined_benefit_pension_plan
Mar. 31, 2017
CAD ($)
Mar. 31, 2016
CAD ($)
Disclosure of defined benefit plans [line items]      
Number Of Registered Funded Defined Benefit Pension Plans | funded_defined_benefit_pension_plan 3    
Number Of Registered Funded Defined Benefit Pension Plans For Employees | funded_defined_benefit_pension_plan 2    
Number Of Registered Funded Defined Benefit Pension Plans For Designated Executives | funded_defined_benefit_pension_plan 1    
Net defined benefit liability (asset) $ 200.6 $ 157.7  
Letters of credit outstanding, amount 60.3 59.1  
Post-employment benefits – defined benefit plans 31.1 30.8  
Finance expense 4.9 5.2  
Finance costs, capitalized $ 1.3 1.1  
Weighted average duration of defined benefit obligation, period 19 years 1 month 24 days    
Percentage of reasonably possible increase in actuarial assumption 0.25%    
Cost of sales      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans $ 15.6 12.5  
Research and development expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans 5.9 4.9  
Selling, general and administrative expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans 4.7 8.2  
Present value of defined benefit obligation | Unfunded      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) $ 85.8 $ 79.1 $ 76.6