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Capital stock - Narrative (Details)
 12 Months Ended
Nov. 05, 2024
$ / shares
Feb. 23, 2024
shares
Jan. 30, 2024
shares
Sep. 30, 2024
CAD ($)
shares
vote
Sep. 30, 2023
CAD ($)
shares
Sep. 30, 2022
CAD ($)
Disclosure of classes of share capital [line items]            
Release of shares held in trusts       $ (15,407,000) $ (13,879,000)  
Withholding taxes remitted on the net settlement of performance share units       15,407,000 13,879,000  
Purchase of treasury shares       66,847,000 74,455,000  
Exercise of stock options       76,535,000 88,316,000  
Purchase and cancellation of Class A subordinate voting shares       934,765,000 $ 788,020,000  
Net tax liability related to shares repurchased and issued       $ 13,565,000    
Major ordinary share transactions            
Disclosure of classes of share capital [line items]            
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share | $ / shares $ 0.15          
PSUs            
Disclosure of classes of share capital [line items]            
Release of shares held in trusts (in shares) | shares       280,265 294,203  
Capital stock            
Disclosure of classes of share capital [line items]            
Release of shares held in trusts (in shares) | shares       0 0  
Release of shares held in trusts       $ 14,078,000 $ 13,680,000  
Purchase of treasury shares       66,847,000 74,455,000  
Exercise of stock options       $ 91,800,000 $ 106,051,000  
Purchased and cancelled (in shares) | shares       6,597,158,000 6,234,096,000  
Purchased and cancelled       $ 45,878,000 $ 61,265,000  
Reclassified between classes of share capital (in shares) | shares       0    
Capital stock | PSUs            
Disclosure of classes of share capital [line items]            
Release of shares held in trusts (in shares) | shares       171,751 172,018  
Contributed surplus            
Disclosure of classes of share capital [line items]            
Release of shares held in trusts       $ (30,308,000) $ (24,674,000)  
Exercise of stock options       (15,265,000) (17,735,000)  
Retained earnings            
Disclosure of classes of share capital [line items]            
Release of shares held in trusts       $ 823,000 $ (2,885,000)  
Preferred shares | Capital stock            
Disclosure of classes of share capital [line items]            
Number of votes per share | vote       1    
Class A subordinate voting shares | Capital stock            
Disclosure of classes of share capital [line items]            
Number of votes per share | vote       1    
Release of shares held in trusts (in shares) | shares       0 0  
Release of shares held in trusts       $ 14,078,000 $ 13,680,000  
Shares purchased (in shares) | shares       463,364 640,052  
Purchase of treasury shares       $ 66,847,000 $ 74,455,000  
Exercise of stock options       $ 91,800,000 $ 106,051,000  
Purchased and cancelled (in shares) | shares       6,597,158,000 6,234,096,000  
Purchased and cancelled       $ 45,878,000 $ 61,265,000  
Reclassified between classes of share capital (in shares) | shares       (2,322,948,000)    
Class A subordinate voting shares | Capital stock | Current normal course issuer bid            
Disclosure of classes of share capital [line items]            
Number of shares authorized for purchase and cancellation (in shares) | shares     20,457,737      
Purchased and cancelled (in shares) | shares   1,674,930   1,674,930    
Purchased and cancelled       $ 250,000,000    
Share issue related cost       $ 370,000    
Class A subordinate voting shares | Capital stock | Previous and current normal course issuer bid            
Disclosure of classes of share capital [line items]            
Purchased and cancelled (in shares) | shares       1,965,800 2,857,550  
Purchased and cancelled       $ 275,218,000 $ 386,906,000  
Class A subordinate voting shares | Capital stock | Normal course issuer bid - Caisse de depot            
Disclosure of classes of share capital [line items]            
Purchased and cancelled (in shares) | shares       2,887,878 3,344,996  
Purchased and cancelled       $ 400,000,000 $ 400,000,000  
Class A subordinate voting shares | Capital stock | Previous normal course issuer bid            
Disclosure of classes of share capital [line items]            
Purchased and cancelled (in shares) | shares       68,550 100,100  
Purchased and cancelled       $ 558,000 $ 778,000 $ 10,291,000
Purchase and cancellation of Class A subordinate voting shares       $ 9,177,000    
Class A subordinate voting shares | Capital stock | Co-Founder and Advisor to the Executive Chairman of the Board            
Disclosure of classes of share capital [line items]            
Reclassified between classes of share capital (in shares) | shares       (900,000)    
Class A subordinate voting shares | Capital stock | Company Wholly-owned by the Founder and Executive Chairman of the Board            
Disclosure of classes of share capital [line items]            
Reclassified between classes of share capital (in shares) | shares       (1,422,948)    
Class A subordinate voting shares | Capital stock | PSUs            
Disclosure of classes of share capital [line items]            
Shares outstanding, held in trust (in shares) | shares       2,601,356 2,309,743  
Class A subordinate voting shares | Contributed surplus            
Disclosure of classes of share capital [line items]            
Exercise of stock options       $ 15,265,000 $ 17,735,000  
Class A subordinate voting shares | Retained earnings | Current normal course issuer bid            
Disclosure of classes of share capital [line items]            
Purchased and cancelled       244,821,000    
Class A subordinate voting shares | Retained earnings | Previous and current normal course issuer bid            
Disclosure of classes of share capital [line items]            
Purchased and cancelled       258,883,000 363,747,000  
Class A subordinate voting shares | Retained earnings | Normal course issuer bid - Caisse de depot            
Disclosure of classes of share capital [line items]            
Purchased and cancelled       $ 375,636,000 $ 361,791,000  
Class B shares (multiple voting) | Capital stock            
Disclosure of classes of share capital [line items]            
Number of votes per share | vote       10    
Release of shares held in trusts (in shares) | shares       0 0  
Release of shares held in trusts       $ 0 $ 0  
Purchase of treasury shares       0 0  
Exercise of stock options       $ 0 $ 0  
Purchased and cancelled (in shares) | shares       0 0  
Purchased and cancelled       $ 0 $ 0  
Reclassified between classes of share capital (in shares) | shares       2,322,948,000    
Class B shares (multiple voting) | Capital stock | Co-Founder and Advisor to the Executive Chairman of the Board            
Disclosure of classes of share capital [line items]            
Reclassified between classes of share capital (in shares) | shares       900,000    
Class B shares (multiple voting) | Capital stock | Company Wholly-owned by the Founder and Executive Chairman of the Board            
Disclosure of classes of share capital [line items]            
Reclassified between classes of share capital (in shares) | shares       1,422,948    
Class B multiple voting shares converted to Class A subordinate voting shares | Capital stock | Current normal course issuer bid            
Disclosure of classes of share capital [line items]            
Purchased and cancelled (in shares) | shares       1,266,366