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Income taxes - Disclosure of deferred tax balances (Details) - CAD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Taxes [Abstract]
Deferred tax assets	$ 239,284	$ 242,567
Deferred tax liabilities	(71,673)	(21,132)
Deferred tax assets (liabilities)	$ 167,611	$ 221,435	$ 74,351

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- Definition

Income Taxes [Abstract]

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No definition available.

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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]]

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

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