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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2023
CAD ($)
Mar. 31, 2024
CAD ($)
funded_defined_benefit_pension_plan
shares
Mar. 31, 2023
CAD ($)
shares
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   $ 54.3 $ 56.5
Post-employment benefits, expense (gain)   $ (34.6) $ (38.5)
Number of common shares in the pension plan assets (in shares) | shares   0 0
Average duration of the defined benefit obligation (in years)   18 years  
Discontinued operations      
Disclosure of defined benefit plans [line items]      
Post-employment benefits, expense (gain)   $ 0.4 $ (1.6)
Funded plans      
Disclosure of defined benefit plans [line items]      
Settlement gain   5.4 0.0
Funded plans | Discontinued operations      
Disclosure of defined benefit plans [line items]      
Settlement gain   0.2  
Funded plans | Present value of defined benefit obligation      
Disclosure of defined benefit plans [line items]      
Settlements $ 168.9 168.9 11.7
Funded plans | Fair value of plan assets      
Disclosure of defined benefit plans [line items]      
Settlements $ (163.5) (163.5) (11.7)
Cost of sales      
Disclosure of defined benefit plans [line items]      
Post-employment benefits, expense (gain)   (18.1) (19.4)
Research and development expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits, expense (gain)   (4.5) (5.8)
Selling, general and administrative expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits, expense (gain)   (12.8) (8.4)
Restructuring, integration and acquisition costs      
Disclosure of defined benefit plans [line items]      
Post-employment benefits, expense (gain)   (3.2) 0.0
Finance expense      
Disclosure of defined benefit plans [line items]      
Post-employment benefits, expense (gain)   (1.8) (3.3)
Capitalized pension costs      
Disclosure of defined benefit plans [line items]      
Post-employment benefits, expense (gain)   (2.6) $ (3.2)
Other gains and losses | Funded plans      
Disclosure of defined benefit plans [line items]      
Settlement gain   $ 5.2