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Share-based payments - Performance share units and restricted share units (Details)	12 Months Ended
	Sep. 30, 2024 shares
PSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period for stock options	4 years
RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period for stock options	4 years
Class A subordinate voting shares | PSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares per instrument granted which participants are entitled to (in shares)	1
Class A subordinate voting shares | RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares per instrument granted which participants are entitled to (in shares)	1

X

- Definition

Number Of Shares To Be Received For Each Instrument Granted In Share-Based Payment Arrangement

+ References

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+ Details

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X

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Period 2

+ References

No definition available.

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Details

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