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Capital stock - Narrative (Details) - Capital stock	12 Months Ended
	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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Number Of Votes

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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