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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefits – defined benefit plans | $ 40.4 | $ 43.0
Funded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 30.8 | 32.5
Interest expense (income), net defined benefit liability (asset) | (17.9) | (15.8)
Past service cost, net defined benefit liability (asset) | (1.8) | 0.0
Administrative costs, net defined benefit liability (asset) | 1.1 | 1.1
Post-employment benefits – defined benefit plans | 33.8 | 36.9
Funded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 30.8 | 32.5
Interest expense (income), net defined benefit liability (asset) | 21.6 | 19.1
Unfunded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.8 | 3.9
Interest expense (income), net defined benefit liability (asset) | 2.8 | 2.3
Past service cost, net defined benefit liability (asset) | 0.0 | (0.1)
Post-employment benefits – defined benefit plans | 6.6 | 6.1
Unfunded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.8 | 3.9
Interest expense (income), net defined benefit liability (asset) | 2.8 | 2.3
Canada |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefits – defined benefit plans | 39.7 | 39.8
Canada | Funded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 28.4 | 30.4
Interest expense (income), net defined benefit liability (asset) | (16.9) | (14.9)
Past service cost, net defined benefit liability (asset) | 1.0 | 0.0
Administrative costs, net defined benefit liability (asset) | 0.9 | 0.9
Post-employment benefits – defined benefit plans | 33.9 | 34.4
Canada | Funded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 28.4 | 30.4
Interest expense (income), net defined benefit liability (asset) | 20.5 | 18.0
Canada | Unfunded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.2 | 3.3
Interest expense (income), net defined benefit liability (asset) | 2.6 | 2.1
Past service cost, net defined benefit liability (asset) | 0.0 | 0.0
Post-employment benefits – defined benefit plans | 5.8 | 5.4
Canada | Unfunded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.2 | 3.3
Interest expense (income), net defined benefit liability (asset) | 2.6 | 2.1
Foreign |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefits – defined benefit plans | 0.7 | 3.2
Foreign | Funded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 2.4 | 2.1
Interest expense (income), net defined benefit liability (asset) | (1.0) | (0.9)
Past service cost, net defined benefit liability (asset) | (2.8) | 0.0
Administrative costs, net defined benefit liability (asset) | 0.2 | 0.2
Post-employment benefits – defined benefit plans | (0.1) | 2.5
Foreign | Funded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 2.4 | 2.1
Interest expense (income), net defined benefit liability (asset) | 1.1 | 1.1
Foreign | Unfunded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.6 | 0.6
Interest expense (income), net defined benefit liability (asset) | 0.2 | 0.2
Past service cost, net defined benefit liability (asset) | 0.0 | (0.1)
Post-employment benefits – defined benefit plans | 0.8 | 0.7
Foreign | Unfunded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.6 | 0.6
Interest expense (income), net defined benefit liability (asset) | $ 0.2 | $ 0.2

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_d&doctype=Standard -URIDate 2020-01-01 + Details
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