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Accumulated other comprehensive income - Narrative (Details) - CAD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Disclosure of analysis of other comprehensive income by item [abstract]
Net unrealized gains on cash flow hedges previously recognized in other comprehensive income, reclassified to net earnings	$ 4,594,000	$ 10,872,000
Income tax relating to cash flow hedges included in other comprehensive income	1,627,000	3,814,000
Deferred costs of hedging on cross-currency swaps	12,169,000	12,562,000
Reclassification adjustments on other comprehensive income (loss), deferred gains (cost) of hedging, tax	$ 1,859,000	$ 1,919,000

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Reclassification Adjustments On Other Comprehensive Income Loss, Deferred Gains (Cost) Of Hedging

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

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The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

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