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Capital stock - Schedule of outstanding shares (Details)
 12 Months Ended
Sep. 30, 2024
CAD ($)
shares
Sep. 30, 2023
CAD ($)
shares
Sep. 30, 2022
CAD ($)
shares
Disclosure of classes of share capital [line items]      
Equity $ 9,427,990,000 $ 8,310,294,000 $ 7,272,724,000
Release of shares held in trusts (15,407,000) (13,879,000)  
Purchased and held in trusts $ (66,847,000) $ (74,455,000)  
Issued upon exercise of stock options (in shares) | shares 1,333,876 1,646,044  
Exercise of stock options $ 76,535,000 $ 88,316,000  
Capital stock      
Disclosure of classes of share capital [line items]      
Number of shares outstanding | shares 227,896,921,000 233,160,203,000 237,748,255,000
Equity $ 1,470,333,000 $ 1,477,180,000 $ 1,493,169,000
Release of shares held in trusts (in shares) | shares 0 0  
Release of shares held in trusts $ 14,078,000 $ 13,680,000  
Purchased and held in trust (in shares) | shares 0 0  
Purchased and held in trusts $ (66,847,000) $ (74,455,000)  
Issued upon exercise of stock options (in shares) | shares 1,333,876,000 1,646,044,000  
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    
Conversion of shares $ 0    
Class A subordinate voting shares | Capital stock      
Disclosure of classes of share capital [line items]      
Number of shares outstanding | shares 203,774,163,000 206,714,497,000 211,302,549,000
Equity $ 1,436,680,000 $ 1,440,286,000 $ 1,456,275,000
Release of shares held in trusts (in shares) | shares 0 0  
Release of shares held in trusts $ 14,078,000 $ 13,680,000  
Purchased and held in trust (in shares) | shares 0 0  
Purchased and held in trusts $ (66,847,000) $ (74,455,000)  
Issued upon exercise of stock options (in shares) | shares 1,333,876,000 1,646,044,000  
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    
Conversion of shares $ 3,241,000    
Class B shares (multiple voting) | Capital stock      
Disclosure of classes of share capital [line items]      
Number of shares outstanding | shares 24,122,758,000 26,445,706,000 26,445,706,000
Equity $ 33,653,000 $ 36,894,000 $ 36,894,000
Release of shares held in trusts (in shares) | shares 0 0  
Release of shares held in trusts $ 0 $ 0  
Purchased and held in trust (in shares) | shares 0 0  
Purchased and held in trusts $ 0 $ 0  
Issued upon exercise of stock options (in shares) | 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)    
Conversion of shares $ (3,241,000)