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Supplementary cash flow information - Interest and income taxes paid and received (Details) - CAD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flow Statement [Abstract]
Interest paid	$ 130,570	$ 115,408
Interest received	87,239	28,247
Income taxes paid	$ 480,607	$ 435,558

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- Definition

Cash Flows Statement [Abstract]

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No definition available.

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- Definition

The cash flows from income taxes paid or refunded, classified as operating activities. [Refer: Income taxes paid (refund)]

+ References

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- Definition

The cash outflow for interest paid, classified as operating activities.

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- Definition

The cash inflow from interest received, classified as operating activities.

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