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Capital stock - Schedule of outstanding shares (Details)
$ in Thousands
 12 Months Ended
Feb. 01, 2022
shares
Mar. 01, 2021
shares
Sep. 30, 2022
CAD ($)
shares
transaction
Sep. 30, 2021
CAD ($)
shares
Reconciliation of number of shares outstanding [abstract]        
Equity at beginning of period     $ 6,986,232 $ 7,264,160
Release of shares held in trusts     $ 0 $ 0
Issued upon exercise of stock options (in shares) | shares     941,059 1,290,919
Issued upon exercise of stock options     $ 41,687 $ 61,054
Purchased and held in trust     (70,303) (31,404)
Equity at end of period     $ 7,272,724 $ 6,986,232
Capital stock        
Reconciliation of number of shares outstanding [abstract]        
Beginning balance (in shares) | shares     245,617,035,000 259,636,581,000
Equity at beginning of period     $ 1,632,705 $ 1,761,873
Release of shares held in trusts (in shares) | shares     0 0
Release of shares held in trusts     $ 15,821 $ 7,150
Issued upon exercise of stock options (in shares) | shares     941,059,000 1,290,919,000
Issued upon exercise of stock options     $ 50,236 $ 73,827
Purchased and cancelled (in shares) | shares     (8,809,839,000) (15,310,465,000)
Purchased and cancelled     $ (134,409) $ (177,560)
Purchased and not cancelled (in shares) | shares     0 0
Purchased and not cancelled     $ (881) $ (1,181)
Purchased and held in trust (in shares) | shares     0 0
Purchased and held in trust     $ (70,303) $ (31,404)
Conversion of shares (in shares) | shares       0
Conversion of shares       $ 0
Ending balance (in shares) | shares     237,748,255,000 245,617,035,000
Equity at end of period     $ 1,493,169 $ 1,632,705
Capital stock | Class A subordinate voting shares        
Reconciliation of number of shares outstanding [abstract]        
Beginning balance (in shares) | shares     219,171,329,000 230,690,875,000
Equity at beginning of period     $ 1,595,811 $ 1,721,491
Release of shares held in trusts (in shares) | shares     0 0
Release of shares held in trusts     $ 15,821 $ 7,150
Issued upon exercise of stock options (in shares) | shares     941,059,000 1,290,919,000
Issued upon exercise of stock options     $ 50,236 $ 73,827
Purchased and cancelled (in shares) | shares     (8,809,839,000) (15,310,465,000)
Purchased and cancelled     $ (134,409) $ (177,560)
Purchased and not cancelled (in shares) | shares     0 0
Purchased and not cancelled     $ (881) $ (1,181)
Purchased and held in trust (in shares) | shares     0 0
Purchased and held in trust     $ (70,303) $ (31,404)
Conversion of shares (in shares) | shares   2,500,000   2,500,000,000
Conversion of shares       $ 3,488
Ending balance (in shares) | shares     211,302,549,000 219,171,329,000
Equity at end of period     $ 1,456,275 $ 1,595,811
Number of treasury shares purchased and cancelled, after the reporting period (in shares) | shares       150,000
Purchase and cancellation of treasury shares, after the reporting period       $ 1,181
Payments to acquire or redeem entity's shares and cancellation, after the reporting period       $ 16,402
Shares purchased (in shares) | shares     643,629 309,606
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     113,405  
Purchase and cancellation of treasury shares, after the reporting period     $ 881  
Payments to acquire or redeem entity's shares and cancellation, after the reporting period     $ 11,670  
Capital stock | Class B multiple voting shares        
Reconciliation of number of shares outstanding [abstract]        
Beginning balance (in shares) | shares     26,445,706,000 28,945,706,000
Equity at beginning of period     $ 36,894 $ 40,382
Release of shares held in trusts (in shares) | shares     0 0
Release of shares held in trusts     $ 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 0
Purchased and not cancelled     $ 0 $ 0
Purchased and held in trust (in shares) | shares     0 0
Purchased and held in trust     $ 0 $ 0
Conversion of shares (in shares) | shares   2,500,000   (2,500,000,000)
Conversion of shares       $ (3,488)
Ending balance (in shares) | shares     26,445,706,000 26,445,706,000
Equity at end of period     $ 36,894 $ 36,894
Contributed surplus        
Reconciliation of number of shares outstanding [abstract]        
Equity at beginning of period     289,718 252,935
Release of shares held in trusts     (15,821) (7,150)
Issued upon exercise of stock options     (8,549) (12,773)
Equity at end of period     314,804 289,718
Contributed surplus | Class A subordinate voting shares        
Reconciliation of number of shares outstanding [abstract]        
Issued upon exercise of stock options     8,549 12,773
Retained earnings        
Reconciliation of number of shares outstanding [abstract]        
Equity at beginning of period     4,732,229 4,703,642
Equity at end of period     $ 5,425,005 $ 4,732,229
PSUs        
Reconciliation of number of shares outstanding [abstract]        
Release of shares held in trusts (in shares) | shares     237,294 119,108
PSUs | Capital stock        
Reconciliation of number of shares outstanding [abstract]        
Release of shares held in trusts (in shares) | shares     235,441 119,108
PSUs | Capital stock | Class A subordinate voting shares        
Reconciliation of number of shares outstanding [abstract]        
Shares outstanding, held in trust (in shares) | shares     1,841,709 1,433,521
Normal Course Issuer Bid | Capital stock | Class A subordinate voting shares        
Reconciliation of number of shares outstanding [abstract]        
Purchased and cancelled (in shares) | shares     (3,866,171) (11,255,600)
Purchased and cancelled     $ (408,656) $ (1,119,226)
Number of shares authorized for purchase and cancellation (in shares) | shares 18,781,981      
Normal Course Issuer Bid | Retained earnings | Class A subordinate voting shares        
Reconciliation of number of shares outstanding [abstract]        
Purchased and cancelled     $ (378,340) $ (1,030,437)
Normal Course Issuer Bid - Caisse de depot        
Reconciliation of number of shares outstanding [abstract]        
Number of transactions | transaction     2  
Number of exemption order issued by the AMF | transaction     2  
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     (4,907,073) (4,204,865)
Purchased and cancelled     $ (500,000) $ (400,000)
Normal Course Issuer Bid - Caisse de depot | Retained earnings | Class A subordinate voting shares        
Reconciliation of number of shares outstanding [abstract]        
Purchased and cancelled     $ (395,026) $ (310,048)