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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2021
CAD ($)
funded_defined_benefit_pension_plan
Mar. 31, 2020
CAD ($)
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  
Letters of credit outstanding, amount $ 68.0 $ 60.6
Post-employment benefits, expense (gain) $ 38.9 40.0
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, expense (gain) $ 18.5 15.8
Research and development expenses    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 5.5 4.3
Selling, general and administrative expenses    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 10.2 14.3
Finance Expense    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 6.5 5.6
Capitalized Pension Costs    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 1.5 3.0
Restructuring, Integration And Acquisition Costs    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) $ (1.8) $ 0.0