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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disclosure of net defined benefit liability (asset) [line items] |  |
Net pension costs | $ 37.2 | $ 41.7
Funded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 31.9 | 32.5
Interest cost and income | (25.4) | (24.1)
Past service cost | 2.9 | 0.0
Settlement gain | (5.4) | 0.0
Administrative cost | 0.8 | 0.6
Net pension costs | 27.6 | 33.1
Funded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 31.9 | 32.5
Interest cost and income | 22.8 | 24.1
Unfunded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 5.2 | 5.1
Interest cost and income | 4.4 | 3.3
Past service cost | 0.0 | 0.2
Net pension costs | 9.6 | 8.6
Unfunded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 5.2 | 5.1
Interest cost and income | 4.4 | 3.3
Canadian |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net pension costs | 35.4 | 40.2
Canadian | Funded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 31.9 | 32.5
Interest cost and income | (25.1) | (23.9)
Past service cost | 2.9 | 0.0
Settlement gain | (5.4) | 0.0
Administrative cost | 0.8 | 0.6
Net pension costs | 27.6 | 33.1
Canadian | Funded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 31.9 | 32.5
Interest cost and income | 22.5 | 23.9
Canadian | Unfunded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.9 | 4.1
Interest cost and income | 3.9 | 3.0
Past service cost | 0.0 | 0.0
Net pension costs | 7.8 | 7.1
Canadian | Unfunded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.9 | 4.1
Interest cost and income | 3.9 | 3.0
Foreign |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net pension costs | 1.8 | 1.5
Foreign | Funded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.0 | 0.0
Interest cost and income | (0.3) | (0.2)
Past service cost | 0.0 | 0.0
Settlement gain | 0.0 | 0.0
Administrative cost | 0.0 | 0.0
Net pension costs | 0.0 | 0.0
Foreign | Funded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.0 | 0.0
Interest cost and income | 0.3 | 0.2
Foreign | Unfunded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 1.3 | 1.0
Interest cost and income | 0.5 | 0.3
Past service cost | 0.0 | 0.2
Net pension costs | 1.8 | 1.5
Foreign | Unfunded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 1.3 | 1.0
Interest cost and income | $ 0.5 | $ 0.3

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- Definition Post-employment Benefit Cost, Defined Benefit Plans + References No definition available. + Details
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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 2023-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of income (expense) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Post-employment benefit expense in profit or loss, defined benefit plans; Defined benefit plans [member]; Actuarial assumptions [member]] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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