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INTANGIBLE ASSETS - Goodwill Reconciliation (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill at the start of the period | $ 1,971.3 | $ 2,663.3
Disposal of discontinued operations (Note 3) |  | (120.4)
Impairment | 0.0 | (568.0)
Business combinations (Note 2 and 7) | 350.2 |
Foreign currency exchange differences | 118.2 | (3.6)
Goodwill at the end of the period | 2,439.7 | 1,971.3
Discontinued operations |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill at the start of the period | 0.0 | 120.4
Disposal of discontinued operations (Note 3) |  | (120.4)
Impairment |  | 0.0
Business combinations (Note 2 and 7) | 0.0 |
Foreign currency exchange differences | 0.0 | 0.0
Goodwill at the end of the period | 0.0 | 0.0
Civil Aviation |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill at the start of the period | 1,120.8 | 1,125.6
Disposal of discontinued operations (Note 3) |  | 0.0
Impairment |  | 0.0
Business combinations (Note 2 and 7) | 350.2 |
Foreign currency exchange differences | 69.8 | (4.8)
Goodwill at the end of the period | 1,540.8 | 1,120.8
Defense and Security |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill at the start of the period | 850.5 | 1,417.3
Disposal of discontinued operations (Note 3) |  | 0.0
Impairment |  | (568.0)
Business combinations (Note 2 and 7) | 0.0 |
Foreign currency exchange differences | 48.4 | 1.2
Goodwill at the end of the period | $ 898.9 | $ 850.5

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- Definition The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_ii&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 134 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_134_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_135_a&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of goodwill derecognised without having previously been included in a disposal group classified as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_iv&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_vi&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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