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Capital stock - Schedule of outstanding shares (Details)
 12 Months Ended
Sep. 30, 2025
CAD ($)
shares
Sep. 30, 2024
CAD ($)
shares
Sep. 30, 2023
CAD ($)
shares
Disclosure of classes of share capital [line items]      
Equity $ 10,282,332,000 $ 9,427,990,000 $ 8,310,294,000
Purchased and held in trusts $ (13,323,000) $ (66,847,000)  
Issued upon exercise of stock options (in shares) | shares 947,071 1,333,876  
Issued upon exercise of stock options $ 61,989,000 $ 76,535,000  
Capital stock      
Disclosure of classes of share capital [line items]      
Number of shares outstanding | shares 220,062,749,000 227,896,921,000 233,160,203,000
Equity $ 1,499,917,000 $ 1,470,333,000 $ 1,477,180,000
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  
Purchased and held in trust (in shares) | shares 0 0  
Purchased and held in trusts $ (13,323,000) $ (66,847,000)  
Conversion of shares (in shares) | shares   0  
Conversion of shares   $ 0  
Issued upon exercise of stock options (in shares) | shares 947,071,000 1,333,876,000  
Issued upon 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      
Disclosure of classes of share capital [line items]      
Number of shares outstanding | shares 195,939,991,000 203,774,163,000 206,714,497,000
Equity $ 1,466,264,000 $ 1,436,680,000 $ 1,440,286,000
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  
Purchased and held in trust (in shares) | shares 0 0  
Purchased and held in trusts $ (13,323,000) $ (66,847,000)  
Conversion of shares (in shares) | shares   2,322,948,000  
Conversion of shares   $ 3,241,000  
Issued upon exercise of stock options (in shares) | shares 947,071,000 1,333,876,000  
Issued upon 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 B shares (multiple voting) | Capital stock      
Disclosure of classes of share capital [line items]      
Number of shares outstanding | shares 24,122,758,000 24,122,758,000 26,445,706,000
Equity $ 33,653,000 $ 33,653,000 $ 36,894,000
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  
Purchased and held in trust (in shares) | shares 0 0  
Purchased and held in trusts $ 0 $ 0  
Conversion of shares (in shares) | shares   (2,322,948,000)  
Conversion of shares   $ (3,241,000)  
Issued upon exercise of stock options (in shares) | shares 0 0  
Issued upon exercise of stock options $ 0 $ 0  
Purchased and cancelled (in shares) | shares 0 0  
Purchased and cancelled $ 0 $ 0