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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 |

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