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Shareholders' equity - Normal Course Issuer Bid (Details) - CAD ($) $ in Millions | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2025 | Mar. 29, 2026 | Nov. 09, 2026 | Mar. 29, 2026 | Nov. 21, 2025 | Mar. 30, 2025 | Nov. 21, 2024 | Mar. 31, 2024
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  |  |  | 7,855,007
Subordinate voting shares |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  |  |  | 7,855,007
Maximum | Subordinate voting shares |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares authorized for repurchase (in shares) |  |  |  |  | 4,556,841 |  | 4,980,505 |
Fiscal 2026 NCIB | Share repurchase |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Public float authorized for repurchase (as percent) |  |  | 10.00% |  |  |  |  |
Average daily trading volume authorized for repurchase (as percent) |  |  | 25.00% |  |  |  |  |
Fiscal 2026 NCIB | Subordinate voting shares |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 0 |  |  |  |  |  |
Fiscal 2026 NCIB | Maximum | Subordinate voting shares | Share repurchase |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares authorized for repurchase (in shares) |  |  | 4,578,677 |  |  |  |  |
Number of shares authorized for repurchase daily (in shares) |  |  | 58,127 |  |  |  |  |
Fiscal 2025 NCIB | Subordinate voting shares |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) | 0 |  |  | 0 |  |  |  |
Fiscal 2024 NCIB | Subordinate voting shares |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  | 0 |  | 3,586,124
NCIB purchase of subordinate voting shares |  |  |  |  |  |  |  | $ 56.9
Fiscal 2024 NCIB | Subordinate voting shares | Retained earnings |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
NCIB purchase of subordinate voting shares |  |  |  |  |  |  |  | $ 48.8
Automatic Share Purchase Plan (“ASPP”) | Subordinate voting shares |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  |  |  | 3,088,648
NCIB purchase of subordinate voting shares |  |  |  |  |  |  |  | $ 49.6

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