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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2021 CAD ($) funded_defined_benefit_pension_plan | Mar. 31, 2020 CAD ($)
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, amount | $ 68.0 | $ 60.6
Post-employment benefits, expense (gain) | $ 38.9 | 40.0
Weighted average duration of defined benefit obligation, period | 19 years |
Percentage of reasonably possible increase in actuarial assumption | 0.25% |
Cost of sales |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | $ 18.5 | 15.8
Research and development expenses |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 5.5 | 4.3
Selling, general and administrative expenses |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 10.2 | 14.3
Finance Expense |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 6.5 | 5.6
Capitalized Pension Costs |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | 1.5 | 3.0
Restructuring, Integration And Acquisition Costs |  |
Disclosure of defined benefit plans [line items] |  |
Post-employment benefits, expense (gain) | $ (1.8) | $ 0.0

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