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TAXATION - Narrative (Details) - CAD ($) $ in Thousands	12 Months Ended
	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

X

- Definition

Pillar Two Income Tax Expense (Benefit)

+ References

No definition available.

+ Details

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X

- 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

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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X

- 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

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