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EMPLOYEE BENEFITS OBLIGATIONS - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 CAD ($) funded_defined_benefit_pension_plan | Mar. 31, 2018 CAD ($) | Mar. 31, 2017 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 |  |
Net defined benefit liability (asset) | $ 212.6 | $ 200.6 |
Letters of credit outstanding, amount | 58.9 | 60.3 |
Post-employment benefits – defined benefit plans | 38.4 | 31.1 |
Finance expense | 5.7 | 4.9 |
Finance costs, capitalized | $ 2.5 | 1.3 |
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 – defined benefit plans | $ 15.4 | 15.6 |
Research and development expenses |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits – defined benefit plans | 5.5 | 5.9 |
Selling, general and administrative expenses |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Post-employment benefits – defined benefit plans | 11.8 | 4.7 |
Present value of defined benefit obligation | Unfunded |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net defined benefit liability (asset) | $ 91.9 | $ 85.8 | $ 79.1

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