v3.26.1
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