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Share-based payments - Stock options (Details) - $ / shares	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Disclosure of classes of share capital [line items]
Weighted average share price for share options at date of exercise (in CAD per share)	$ 145.60	$ 123.25
Stock options
Disclosure of classes of share capital [line items]
Vesting period for stock options	4 years
Expiration period for stock options	10 years
Stock options | Class A subordinate voting shares
Disclosure of classes of share capital [line items]
Number of shares reserved for issuance under the stock option plan (in shares)	15,368,084

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The number of shares reserved for issue under options and contracts for the sale of shares.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The weighted average share price at the date of exercise for share options that are exercised in a share-based payment arrangement. [Refer: Types of share-based payment arrangements [domain]; Weighted average [member]]

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