Income Taxes - Summary of Significant Components of Deferred Income Tax Assets (Liabilities) (Details) - CAD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Deferred income tax assets
Property, plant and equipment	$ 74,028	$ 74,392
Intangible assets	30,263	17,483
Inventory reserves and write-downs	5,584	5,587
Other reserves and accruals	6,501	2,792
Losses carried forward	1,184,939	1,176,913
Equity method investments and other financial assets	113,359	106,570
Deferred financing costs	7,581	11,439
Unrealized losses	62,211	68,877
Other	32,069	10,698
Gross deferred income tax assets	1,516,535	1,474,751
Valuation allowances	(1,508,750)	(1,474,467)
Total deferred income tax assets, net	7,785	284
Deferred income tax liabilities
Property, plant and equipment	(1,849)
Intangible assets	(7,394)
Deferred financing costs	(5,506)
Other	(973)
Total deferred income tax liabilities	(15,722)
Net deferred income tax assets		$ 284
Net deferred income tax liabilities	$ (7,937)

Deferred tax assets deferred financing costs.

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Deferred tax assets, equity method investments and other financial assets.

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Deferred tax assets, unrealized losses.

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Deferred tax liabilities deferred financing costs.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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