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Capital stock (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2025
Disclosure of classes of share capital [abstract] |
Schedule of outstanding shares | For the fiscal years 2025 and 2024, the number of issued and outstanding Class A subordinate voting shares and Class B shares (multiple voting) varied as follows:
Class A subordinate voting shares | Class B shares (multiple voting) |  | Total
| Number | Carrying value | Number | Carrying value | Number | Carrying value
|  | $ |  | $ |  | $
As at September 30, 2023 | 206,714,497 |  | 1,440,286 |  | 26,445,706 |  | 36,894 |  | 233,160,203 |  | 1,477,180 |
Release of Class A subordinate voting shares held in trusts | — |  | 14,078 |  | — |  | — |  | — |  | 14,078 |
Purchased and held in trusts | — |  | (66,847) |  | — |  | — |  | — |  | (66,847) |
Issued upon exercise of stock options | 1,333,876 |  | 91,800 |  | — |  | — |  | 1,333,876 |  | 91,800 |
Purchased and cancelled | (6,597,158) |  | (45,878) |  | — |  | — |  | (6,597,158) |  | (45,878) |
Conversion of shares | 2,322,948 |  | 3,241 |  | (2,322,948) |  | (3,241) |  | — |  | — |
As at September 30, 2024 | 203,774,163 |  | 1,436,680 |  | 24,122,758 |  | 33,653 |  | 227,896,921 |  | 1,470,333 |
Release of Class A subordinate voting shares held in trusts | — |  | 46,050 |  | — |  | — |  | — |  | 46,050 |
Purchased and held in trusts | — |  | (13,323) |  | — |  | — |  | — |  | (13,323) |
Issued upon exercise of stock options | 947,071 |  | 74,319 |  | — |  | — |  | 947,071 |  | 74,319 |
Purchased and cancelled | (8,781,243) |  | (77,462) |  | — |  | — |  | (8,781,243) |  | (77,462) |
As at September 30, 2025 | 195,939,991 |  | 1,466,264 |  | 24,122,758 |  | 33,653 |  | 220,062,749 |  | 1,499,917 |
Schedule of dividend | During the year ended September 30, 2025, the Company declared and paid the following quarterly cash dividends to holders of Class A subordinate voting shares and Class B shares (multiple voting):
| 2025 |  | 2024
Dividend Payment Month | Dividend per Share | Value |  | Dividend per Share | Value
December | 0.15 | 34,133 |  |  | — |  | — |
March | 0.15 | 34,057 |  |  | — |  | — |
June | 0.15 | 33,580 |  |  | — |  | — |
September | 0.15 | 33,282 |  |  | — |  | — |
|  | 135,052 |  |  |  | — |

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