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Supplementary cash flow information - Financing activities (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Cash used in financing activities excluding equity |  |
Repayment of debt assumed in business acquisitions | $ (47,953) | $ (162,146)
Settlement of derivative financial instruments | 0 | 38,943
Non-cash financing activities |  |
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets | 143,914 | 110,778
Long-term debt |  |
Financing activities |  |
Balance, beginning of year | 2,688,308 | 3,100,321
Cash used in financing activities excluding equity |  |
Increase of long-term debt | 923,922 | 747,073
Repayment of long-term debt and lease liabilities | 0 | (1,154,878)
Repayment of debt assumed in business acquisitions | (47,953) | (162,146)
Settlement of derivative financial instruments | 0 | 0
Non-cash financing activities |  |
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets | 0 | 0
Additions through business acquisitions (Note 27) | 58,376 | 162,146
Changes in foreign currency exchange rates | 13,623 | (6,715)
Other | 1,559 | 2,507
Balance, end of year | 3,637,835 | 2,688,308
Derivative financial instruments to hedge long-term debt |  |
Financing activities |  |
Balance, beginning of year | 9,500 | (97,575)
Cash used in financing activities excluding equity |  |
Increase of long-term debt | 0 | 0
Repayment of long-term debt and lease liabilities | 0 | 0
Repayment of debt assumed in business acquisitions | 0 | 0
Settlement of derivative financial instruments | 0 | 38,943
Non-cash financing activities |  |
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets | 0 | 0
Additions through business acquisitions (Note 27) | 0 | 0
Changes in foreign currency exchange rates | 128,285 | 68,132
Other | 0 | 0
Balance, end of year | 137,785 | 9,500
Lease liabilities |  |
Financing activities |  |
Balance, beginning of year | 620,095 | 641,963
Cash used in financing activities excluding equity |  |
Increase of long-term debt | 0 | 0
Repayment of long-term debt and lease liabilities | (177,465) | (146,762)
Repayment of debt assumed in business acquisitions | 0 | 0
Settlement of derivative financial instruments | 0 | 0
Non-cash financing activities |  |
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets | 144,967 | 110,778
Additions through business acquisitions (Note 27) | 69,771 | 2,341
Changes in foreign currency exchange rates | 32,319 | 18,914
Other | 3,797 | (7,139)
Balance, end of year | $ 693,484 | $ 620,095

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