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Fair value of financial instruments - Disclosure of detailed information about fair value of long-term debt (Details) - CAD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Borrowings not measured at fair value | $ 293,281 | $ 336,769
Level 1 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Borrowings not measured at fair value | 293,281 | 286,903
Level 2 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Borrowings not measured at fair value | 0 | 49,866
Fair value [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Borrowings not measured at fair value | 303,000 | 367,928
Fair value [Member] | Level 1 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Borrowings not measured at fair value | 303,000 | 318,000
Fair value [Member] | Level 2 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Borrowings not measured at fair value | $ 0 | $ 49,928

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