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TAXATION - Narrative (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax expense (benefit) | $ (84,546) | $ (29,915)
Pillar two income taxes | 2,100 | 0
Investment tax credits taxable in future years when utilized |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax expense (benefit) | (30,168) | (19,379)
Unrecognized tax benefits | $ 113,654 | $ 7,986

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- Definition Pillar Two Income Tax Expense (Benefit) + References No definition available. + Details
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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 80 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_80_f&doctype=Standard -URIDate 2024-03-27 + Details
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