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Income taxes - Disclosure of deferred tax balances (Details) - CAD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Taxes [Abstract]
Deferred tax assets	$ 242,567	$ 105,432
Deferred tax liabilities	(21,132)	(31,081)
Deferred tax assets (liabilities)	$ 221,435	$ 74,351	$ (71,611)

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- Definition

Income Taxes [Abstract]

+ References

No definition available.

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- Definition

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 12
-IssueDate 2024-01-01
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- Definition

The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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