Investments in affiliates and joint ventures - Summary of Movement in Investments In Affiliates and Joint Ventures (Details) - CAD ($) $ in Thousands		12 Months Ended
Oct. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Equity Method Investment, Financial Statement, Reported Amounts [Roll Forward]
Balance, beginning of the year		$ 81,435	$ 75,637
Additions arising from the acquisition of MacKellar		0	85
Share of net income		15,299	25,199
Dividends and advances received from affiliates and joint ventures		(7,336)	(21,543)
Derecognition of BNA		(4,061)	0
Intercompany eliminations and other		(645)	2,057
Balance, end of the year		$ 84,692	$ 81,435
BNA Remanufacturing Limited Partnership
Equity Method Investment, Financial Statement, Reported Amounts [Roll Forward]
Additions arising from the acquisition of MacKellar	$ 4,210
Ownership percentage	50.00%
BSC Holdings, ULC
Equity Method Investment, Financial Statement, Reported Amounts [Roll Forward]
Ownership percentage	100.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of the entity's equity method investment which has been sold.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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