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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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