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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)

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