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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Estimated amount of loss resulting from an adverse tax position.

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Commitments and Contingencies (Narrative) (Details) $ in Thousands, kr in Millions, $ in Millions	3 Months Ended				8 Months Ended	21 Months Ended	48 Months Ended
	Jun. 30, 2026 CAD ($)	Jun. 30, 2026 SEK (kr)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2021 CAD ($)	Mar. 31, 2023 CAD ($)	Dec. 31, 2024 CAD ($)	Mar. 31, 2026 USD ($)
Other Commitments [Line Items]
Provision for regulatory liabilities		kr 822.0	$ 84,650	$ 0
Exchange rate			9.71
Income tax assessment						$ 4.0	$ 5.4
Disallowed input tax credits being disputed	$ 0.3
GST/HST reassessment					$ 4.2
Proposed GST/HST adjustments	$ 50.5
Power purchase agreement [Member]
Other Commitments [Line Items]
Purchase commitments			$ 174,500					$ 29,100
STA has issued a decision [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities \| kr		769.6
No decision has yet been issued [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities \| kr		52.4
Bikupa Real Estate AB [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities		17.3	$ 1,700
Bikupa Real Estate AB [Member] \| STA has issued a decision [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities \| kr		14.9
Bikupa Real Estate AB [Member] \| No decision has yet been issued [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities \| kr		kr 2.5