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Supplementary cash flow information - Interest and income taxes paid and received (Details) - CAD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flow Statement [Abstract]
Interest paid	$ 115,408	$ 131,646
Interest received	28,247	15,929
Income taxes paid	$ 435,558	$ 382,833

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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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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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