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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2022
CAD ($)
funded_defined_benefit_pension_plan
Mar. 31, 2021
CAD ($)
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 $ 67.0 $ 68.0
Post-employment benefits, expense (gain) $ 40.7 38.9
Average duration of the defined benefit obligation (in years) 18 years  
Change in significant assumptions (in percent) 0.25%  
Cost of sales    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) $ 17.9 18.5
Research and development expenses    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 7.7 5.5
Selling, general and administrative expenses    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 9.8 10.2
Finance expense    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 5.3 6.5
Restructuring, integration and acquisition costs    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) 0.0 1.8
Capitalized pension costs    
Disclosure of defined benefit plans [line items]    
Post-employment benefits, expense (gain) $ 1.7 $ 1.5