v3.24.1.1.u2
Shareholders' equity - Schedule of Transactions Affecting Issued and Outstanding Share Capital (Details) - CAD ($)
$ in Millions
 9 Months Ended 12 Months Ended 16 Months Ended
Dec. 31, 2023
Mar. 31, 2024
Apr. 02, 2023
Apr. 03, 2022
Mar. 31, 2024
Number          
Number of shares outstanding, beginning balance (in shares) 104,188,988 104,188,988 105,194,508 110,439,155  
Purchase of subordinate voting shares (in shares)   (7,855,007) (1,103,102) (5,636,763)  
Purchase of subordinate voting shares held for cancellation (in shares)     (49,700)    
Purchase of subordinate voting shares (in shares)   (7,855,007) (1,152,802) (5,636,763)  
Exercise of stock options (in shares)   64,058 60,248 342,148  
Settlement of RSUs (in shares)   134,475 87,034 49,968  
Total share issuances (in shares)   198,533 147,282 392,116  
Number of shares outstanding, ending balance (in shares)   96,532,514 104,188,988 105,194,508 96,532,514
$          
Shareholders’ equity, beginning balance $ 477.5 $ 477.5 $ 427.9 $ 577.6  
Total share issuances   0.1 0.0 7.1  
Shareholders’ equity, ending balance   $ 423.5 $ 477.5 $ 427.9 $ 423.5
Multiple voting shares          
Number          
Number of shares outstanding, beginning balance (in shares) 51,004,076 51,004,076 51,004,076 51,004,076  
Purchase of subordinate voting shares (in shares)   0 0 0  
Purchase of subordinate voting shares held for cancellation (in shares)     0    
Purchase of subordinate voting shares (in shares)   0 0 0  
Exercise of stock options (in shares)   0 0 0  
Settlement of RSUs (in shares)   0 0 0  
Total share issuances (in shares)   0 0 0  
Number of shares outstanding, ending balance (in shares)   51,004,076 51,004,076 51,004,076 51,004,076
Subordinate voting shares          
Number          
Number of shares outstanding, beginning balance (in shares) 53,184,912 53,184,912 54,190,432 59,435,079  
Purchase of subordinate voting shares (in shares)   (7,855,007) (1,103,102) (5,636,763)  
Purchase of subordinate voting shares held for cancellation (in shares)     (49,700)    
Purchase of subordinate voting shares (in shares) (4,268,883) (7,855,007) (1,152,802) (5,636,763) (5,421,685)
Exercise of stock options (in shares)   64,058 60,248 342,148  
Settlement of RSUs (in shares)   134,475 87,034 49,968  
Total share issuances (in shares)   198,533 147,282 392,116  
Number of shares outstanding, ending balance (in shares)   45,528,438 53,184,912 54,190,432 45,528,438
Share capital          
$          
Shareholders’ equity, beginning balance $ 118.7 $ 118.7 $ 118.5 $ 120.5  
Purchase of subordinate voting shares (in $ per share)   (17.8) (2.4) (11.9)  
Purchase of subordinate voting shares held for cancellation     (0.1)    
Total share purchases   (17.8) (2.5) (11.9)  
Exercise of stock options (in $ per share)   0.2 0.0 8.5  
Settlement of RSUs   3.8 2.7 1.4  
Total share issuances   4.0 2.7 9.9  
Shareholders’ equity, ending balance   104.9 118.7 118.5 $ 104.9
Share capital | Multiple voting shares          
$          
Shareholders’ equity, beginning balance 1.4 1.4 1.4 1.4  
Purchase of subordinate voting shares (in $ per share)   0.0 0.0 0.0  
Purchase of subordinate voting shares held for cancellation     0.0    
Total share purchases   0.0 0.0 0.0  
Exercise of stock options (in $ per share)   0.0 0.0 0.0  
Settlement of RSUs   0.0 0.0 0.0  
Total share issuances   0.0 0.0 0.0  
Shareholders’ equity, ending balance   1.4 1.4 1.4 1.4
Share capital | Subordinate voting shares          
$          
Shareholders’ equity, beginning balance $ 117.3 117.3 117.1 119.1  
Purchase of subordinate voting shares (in $ per share)   (17.8) (2.4) (11.9)  
Purchase of subordinate voting shares held for cancellation     (0.1)    
Total share purchases   (17.8) (2.5) (11.9)  
Exercise of stock options (in $ per share)   0.2 0.0 8.5  
Settlement of RSUs   3.8 2.7 1.4  
Total share issuances   4.0 2.7 9.9  
Shareholders’ equity, ending balance   $ 103.5 $ 117.3 $ 117.1 $ 103.5