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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 CAD ($) funded_defined_benefit_pension_plan shares | Mar. 31, 2022 CAD ($) 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 | $ 56.5 | $ 67.0
Post-employment benefits, expense (gain) | $ 38.5 | $ 40.7
Number of common shares in the pension plan assets (in shares) | shares | 0 | 0
Average duration of the defined benefit obligation (in years) | 16 years |
Change in significant assumptions (in percent) | 0.25% |
Cost of sales |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | $ 20.9 | $ 17.9
Research and development expenses |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 5.8 | 7.7
Selling, general and administrative expenses |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 8.5 | 9.8
Finance expense |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 3.3 | 5.3
Capitalized pension costs |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | $ 3.2 | $ 1.7

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