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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2022 CAD ($) funded_defined_benefit_pension_plan | Mar. 31, 2021 CAD ($)
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 | $ 67.0 | $ 68.0
Post-employment benefits, expense (gain) | $ 40.7 | 38.9
Average duration of the defined benefit obligation (in years) | 18 years |
Change in significant assumptions (in percent) | 0.25% |
Cost of sales |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | $ 17.9 | 18.5
Research and development expenses |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 7.7 | 5.5
Selling, general and administrative expenses |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 9.8 | 10.2
Finance expense |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 5.3 | 6.5
Restructuring, integration and acquisition costs |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 0.0 | 1.8
Capitalized pension costs |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | $ 1.7 | $ 1.5

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