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Income taxes - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 29, 2026 | Mar. 30, 2025 | Mar. 31, 2024
Income taxes paid (refund) [abstract] |  |  |
Effective tax rate that most jurisdictions are above | 15.00% |  |
Current tax related to Pillar Two income taxes | $ 0.0 | $ 3.7 | $ 0.0
Unremitted earnings from foreign subsidiaries | $ 484.6 | $ 495.4 |

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