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INCOME TAXES - Narrative (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 16, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Current year |  | $ 56.7 | $ 74.0
Deferred tax expense (income) relating to origination and reversal of temporary differences |  | (51.5) | 233.3
Income tax recovery | $ 10.2 |  | 18.7
Net deferred tax assets |  | 148.7 | 199.4
Deferred income tax liability |  | 3,456.4 | 3,065.5
Deductible temporary differences |  | 130.4 | 139.6
Unrecognized |  | 214.0 |
Current tax expense (income), related to Pillar Two income taxes |  | 2.6 |
Strategic Aerospace and Defence Initiative (SADI) Program |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Current year |  |  | 57.4
Deferred tax expense (income) relating to origination and reversal of temporary differences |  |  | 61.9
No expiry date |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unrecognized |  | 167.4 |
Capital losses | No expiry date |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unrecognized |  | $ 156.2 | $ 180.2

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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 80 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_80_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of current tax expense (income) related to Pillar Two income taxes. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 88B -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_88B&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deferred tax asset when: (a) the utilisation of the deferred tax asset is dependent on future taxable profits in excess of the profits arising from the reversal of existing taxable temporary differences; and (b) the entity has suffered a loss in either the current or preceding period in the tax jurisdiction to which the deferred tax asset relates. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 82 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_82&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 80 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_80_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Total for all associates [member]; Total for all subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_f&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_e&doctype=Standard -URIDate 2024-03-27 + Details
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