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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) |  |

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