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Capital stock - Narrative (Details) - Capital stock | 12 Months Ended
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Sep. 30, 2022 vote
Preferred shares |
Disclosure of classes of share capital [line items] |
Number of votes per share | 1
Class A subordinate voting shares |
Disclosure of classes of share capital [line items] |
Number of votes per share | 1
Class B multiple voting shares |
Disclosure of classes of share capital [line items] |
Number of votes per share | 10

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