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Financial risk management objectives and policies - Foreign Exchange Risk Narrative (Details) $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 28, 2025 CAD ($) | Mar. 29, 2026 CAD ($) | Mar. 30, 2025 CAD ($) | Mar. 31, 2024 CAD ($) | Aug. 28, 2030 CAD ($) | Aug. 28, 2030 USD ($) | Aug. 21, 2025 USD ($)
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Settlement of term loan derivative contracts |  | $ 6.6 | $ 0.0 | $ 0.0 |  |  |
Term Loan |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Borrowings |  | 410.6 | 412.0 |  |  |  | $ 300.0
Foreign exchange risk |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Unrealized gains (losses) on foreign exchange contracts not treated as hedges |  | (3.9) | 5.7 | 1.7 |  |  |
Foreign exchange risk | Forward contract | Fair value hedges | Term Loan |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Settlement of term loan derivative contracts | $ 6.6 |  |  |  |  |  |
Foreign exchange risk | Forward contract | Fair value hedges | Forecast | Term loan, repricing amendment |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 270.0 |
Notional amount of derivative |  |  |  |  | $ 373.6 |  |
Foreign exchange risk | Long-dated forward exchange contract | Cash flow hedges |  |  |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |  |  |
Unrealized gains (losses) on foreign exchange contracts not treated as hedges |  | $ (10.2) | $ 17.8 | $ (1.3) |  |  |

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