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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2023
CAD ($)
Mar. 31, 2025
CAD ($)
funded_defined_benefit_pension_plan
shares
Mar. 31, 2024
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   $ 63.9 $ 54.3
Post-employment benefits – defined benefit plans (Note 22)   $ 37.4 $ 34.6
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 10 months 24 days  
Discontinued operations      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans (Note 22)     $ (0.4)
Funded plans      
Disclosure of defined benefit plans [line items]      
Settlement gain   $ 1.4 5.4
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 0.0 168.9
Funded plans | Fair value of plan assets      
Disclosure of defined benefit plans [line items]      
Settlements $ (163.5) 1.4 (163.5)
Cost of sales      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans (Note 22)   21.7 18.1
Research and development expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans (Note 22)   5.1 4.5
Selling, general and administrative expenses      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans (Note 22)   10.3 12.8
Restructuring, integration and acquisition costs      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans (Note 22)   (0.4) 3.2
Finance expense      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans (Note 22)   0.7 1.8
Capitalized pension costs      
Disclosure of defined benefit plans [line items]      
Post-employment benefits – defined benefit plans (Note 22)   $ 2.8 2.6
Other gains and losses | Funded plans      
Disclosure of defined benefit plans [line items]      
Settlement gain     $ 5.2