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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

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