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Income taxes - Disclosure of deferred tax balances (Details) - CAD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Taxes [Abstract]
Deferred tax assets	$ 105,432	$ 85,795
Deferred tax liabilities	(31,081)	(157,406)
Deferred tax assets (liabilities)	$ 74,351	$ (71,611)	$ (35,680)

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- Definition

Income Taxes [Abstract]

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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

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- Definition

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

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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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