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Capital stock - Schedule of outstanding shares (Details)
 12 Months Ended
Jan. 31, 2023
shares
Sep. 30, 2023
CAD ($)
shares
Sep. 30, 2022
CAD ($)
shares
Reconciliation of number of shares outstanding [abstract]      
Equity at beginning of period   $ 7,272,724,000 $ 6,986,232,000
Release of shares held in trusts   (13,879,000) 0
Purchased and held in trust   $ (74,455,000) $ (70,303,000)
Issued upon exercise of stock options (in shares) | shares   1,646,044 941,059
Issued upon exercise of stock options   $ 88,316,000 $ 41,687,000
Equity at end of period   8,310,294,000 7,272,724,000
Withholding taxes remitted on the net settlement of performance share units   13,879,000 0
Purchase and cancellation of Class A subordinate voting shares   $ 788,020,000 $ 913,388,000
Capital stock      
Reconciliation of number of shares outstanding [abstract]      
Beginning balance (in shares) | shares   237,748,255,000 245,617,035,000
Equity at beginning of period   $ 1,493,169,000 $ 1,632,705,000
Release of shares held in trusts (in shares) | shares   0 0
Release of shares held in trusts   $ 13,680,000 $ 15,821,000
Purchased and held in trust (in shares) | shares   0 0
Purchased and held in trust   $ (74,455,000) $ (70,303,000)
Issued upon exercise of stock options (in shares) | shares   1,646,044,000 941,059,000
Issued upon exercise of stock options   $ 106,051,000 $ 50,236,000
Purchased and cancelled (in shares) | shares   (6,234,096,000) (8,809,839,000)
Purchased and cancelled   $ (61,265,000) $ (134,409,000)
Purchased and not cancelled (in shares) | shares     0
Purchased and not cancelled     $ (881,000)
Ending balance (in shares) | shares   233,160,203,000 237,748,255,000
Equity at end of period   $ 1,477,180,000 $ 1,493,169,000
Capital stock | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Beginning balance (in shares) | shares   211,302,549,000 219,171,329,000
Equity at beginning of period   $ 1,456,275,000 $ 1,595,811,000
Release of shares held in trusts (in shares) | shares   0 0
Release of shares held in trusts   $ 13,680,000 $ 15,821,000
Purchased and held in trust (in shares) | shares   0 0
Purchased and held in trust   $ (74,455,000) $ (70,303,000)
Issued upon exercise of stock options (in shares) | shares   1,646,044,000 941,059,000
Issued upon exercise of stock options   $ 106,051,000 $ 50,236,000
Purchased and cancelled (in shares) | shares   (6,234,096,000) (8,809,839,000)
Purchased and cancelled   $ (61,265,000) $ (134,409,000)
Purchased and not cancelled (in shares) | shares     0
Purchased and not cancelled     $ (881,000)
Ending balance (in shares) | shares   206,714,497,000 211,302,549,000
Equity at end of period   $ 1,440,286,000 $ 1,456,275,000
Shares purchased (in shares) | shares   640,052 643,629
Capital stock | Class A subordinate voting shares | Major ordinary share transactions      
Reconciliation of number of shares outstanding [abstract]      
Number of treasury shares purchased and cancelled, after the reporting period (in shares) | shares   68,550  
Purchase and cancellation of treasury shares, after the reporting period   $ 558,000  
Payments to acquire or redeem entity's shares and cancellation, after the reporting period   $ 9,177,000  
Capital stock | Class B multiple voting shares      
Reconciliation of number of shares outstanding [abstract]      
Beginning balance (in shares) | shares   26,445,706,000 26,445,706,000
Equity at beginning of period   $ 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 trust   $ 0 $ 0
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
Purchased and not cancelled (in shares) | shares     0
Purchased and not cancelled     $ 0
Ending balance (in shares) | shares   26,445,706,000 26,445,706,000
Equity at end of period   $ 36,894,000 $ 36,894,000
Contributed surplus      
Reconciliation of number of shares outstanding [abstract]      
Equity at beginning of period   314,804,000 289,718,000
Release of shares held in trusts   (24,674,000) (15,821,000)
Issued upon exercise of stock options   (17,735,000) (8,549,000)
Equity at end of period   345,032,000 314,804,000
Contributed surplus | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Issued upon exercise of stock options   17,735,000 8,549,000
Retained earnings      
Reconciliation of number of shares outstanding [abstract]      
Equity at beginning of period   5,425,005,000 4,732,229,000
Release of shares held in trusts   (2,885,000)  
Equity at end of period   $ 6,329,107,000 $ 5,425,005,000
PSUs      
Reconciliation of number of shares outstanding [abstract]      
Release of shares held in trusts (in shares) | shares   294,203 237,294
PSUs | Capital stock      
Reconciliation of number of shares outstanding [abstract]      
Release of shares held in trusts (in shares) | shares   172,018 235,441
PSUs | Capital stock | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Shares outstanding, held in trust (in shares) | shares   2,309,743 1,841,709
Normal Course Issuer Bid | Capital stock | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Purchased and cancelled (in shares) | shares   (2,857,550) (3,866,171)
Purchased and cancelled   $ (386,906,000) $ (408,656,000)
Number of shares authorized for purchase and cancellation (in shares) | shares 18,769,394    
Normal Course Issuer Bid | Retained earnings | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Purchased and cancelled   $ (363,747,000) $ (378,340,000)
Normal Course Issuer Bid - Caisse de depot | Capital stock | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Purchased and cancelled (in shares) | shares   (3,344,996) (4,907,073)
Purchased and cancelled   $ (400,000,000) $ (500,000,000)
Normal Course Issuer Bid - Caisse de depot | Retained earnings | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Purchased and cancelled   $ (361,791,000) $ (395,026,000)
Previous Normal Course Issuer Bid | Capital stock | Class A subordinate voting shares      
Reconciliation of number of shares outstanding [abstract]      
Purchased and cancelled (in shares) | shares   (100,100)  
Purchased and cancelled   $ (778,000)  
Purchase and cancellation of Class A subordinate voting shares   $ 10,291,000