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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2019
CAD ($)
funded_defined_benefit_pension_plan
Mar. 31, 2018
CAD ($)
Mar. 31, 2017
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) $ 212.6 $ 200.6  
Letters of credit outstanding, amount 58.9 60.3  
Post-employment benefits – defined benefit plans 38.4 31.1  
Finance expense 5.7 4.9  
Finance costs, capitalized $ 2.5 1.3  
Weighted average duration of defined benefit obligation, period 19 years    
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 $ 15.4 15.6  
Research and development expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans 5.5 5.9  
Selling, general and administrative expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans 11.8 4.7  
Present value of defined benefit obligation | Unfunded      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) $ 91.9 $ 85.8 $ 79.1