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Capital stock - Narrative (Details)
 12 Months Ended
Nov. 05, 2025
$ / shares
Jan. 28, 2025
shares
Feb. 23, 2024
CAD ($)
shares
Sep. 30, 2025
CAD ($)
shares
vote
Sep. 30, 2024
CAD ($)
shares
Disclosure of classes of share capital [line items]          
Withholding taxes remitted on the net settlement of performance share units       $ 52,888,000 $ 15,407,000
Purchase of treasury shares       13,323,000 66,847,000
Exercise of stock options       61,989,000 76,535,000
Purchase and cancellation of Class A subordinate voting shares       1,274,530,000 934,765,000
Net tax liability related to shares repurchased and issued       22,218,000 13,565,000
Tax payment related to shares repurchased and issued       $ 25,999,000 $ 0
Major ordinary share transactions          
Disclosure of classes of share capital [line items]          
Dividends declared (in CAD per share) | $ / shares $ 0.17        
PSUs          
Disclosure of classes of share capital [line items]          
Release of Class A subordinate voting shares held in trusts (in shares) | shares       765,318 280,265
Capital stock          
Disclosure of classes of share capital [line items]          
Release of Class A subordinate voting shares held in trusts (in shares) | shares       0 0
Release of Class A subordinate voting shares held in trusts       $ 46,050,000 $ 14,078,000
Purchase of treasury shares       13,323,000 66,847,000
Exercise of stock options       $ 74,319,000 $ 91,800,000
Purchased and cancelled (in shares) | shares       8,781,243,000 6,597,158,000
Purchased and cancelled       $ 77,462,000 $ 45,878,000
Capital stock | PSUs          
Disclosure of classes of share capital [line items]          
Release of Class A subordinate voting shares held in trusts (in shares) | shares       438,458 171,751
Contributed surplus          
Disclosure of classes of share capital [line items]          
Exercise of stock options       $ (12,330,000) $ (15,265,000)
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 Class A subordinate voting shares held in trusts (in shares) | shares       0 0
Release of Class A subordinate voting shares held in trusts       $ 46,050,000 $ 14,078,000
Shares purchased (in shares) | shares       84,456 463,364
Purchase of treasury shares       $ 13,323,000 $ 66,847,000
Exercise of stock options       $ 74,319,000 $ 91,800,000
Purchased and cancelled (in shares) | shares       8,781,243,000 6,597,158,000
Purchased and cancelled       $ 77,462,000 $ 45,878,000
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   20,196,413      
Purchased and cancelled (in shares) | shares     1,674,930 80,300  
Purchased and cancelled     $ 250,000,000 $ 708,000  
Purchase and cancellation of Class A subordinate voting shares       $ 9,935,000  
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       8,861,543 1,965,800
Purchased and cancelled       $ 1,258,466,000 $ 275,218,000
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
Purchased and cancelled         $ 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
Purchased and cancelled         $ 558,000
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       2,247,354 2,601,356
Class A subordinate voting shares | Contributed surplus          
Disclosure of classes of share capital [line items]          
Exercise of stock options       $ 12,330,000 $ 15,265,000
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       $ 1,181,004,000 258,883,000
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
Class B shares (multiple voting) | Capital stock          
Disclosure of classes of share capital [line items]          
Number of votes per share | vote       10  
Release of Class A subordinate voting shares held in trusts (in shares) | shares       0 0
Release of Class A subordinate voting 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
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