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Capital stock (Tables) | 12 Months Ended
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Sep. 30, 2024
Disclosure of classes of share capital [abstract] |
Schedule of outstanding shares | For the fiscal years 2024 and 2023, 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, 2022 | 211,302,549 |  | 1,456,275 |  | 26,445,706 |  | 36,894 |  | 237,748,255 |  | 1,493,169 |
Release of shares held in trusts | — |  | 13,680 |  | — |  | — |  | — |  | 13,680 |
Purchased and held in trusts | — |  | (74,455) |  | — |  | — |  | — |  | (74,455) |
Issued upon exercise of stock options | 1,646,044 |  | 106,051 |  | — |  | — |  | 1,646,044 |  | 106,051 |
Purchased and cancelled | (6,234,096) |  | (61,265) |  | — |  | — |  | (6,234,096) |  | (61,265) |
As at September 30, 2023 | 206,714,497 |  | 1,440,286 |  | 26,445,706 |  | 36,894 |  | 233,160,203 |  | 1,477,180 |
Release of 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 |

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- Definition The disclosure of classes of share capital. [Refer: Classes of share capital [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a&doctype=Standard -URIDate 2024-03-27 + Details
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