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Right-of-use assets (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | $ 466,115 |
Ending balance | 541,987 | $ 466,115
Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 359,155 |
Ending balance | 419,210 | 359,155
Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 105,888 |
Ending balance | 121,248 | 105,888
Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 1,072 |
Ending balance | 1,529 | 1,072
Cost |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 1,254,797 | 1,261,354
Additions | 123,864 | 88,465
Additions - business acquisitions | 66,496 | 2,341
Change in estimates and lease modifications | 25,972 | 18,422
Disposals/retirements | (157,667) | (157,480)
Foreign currency translation adjustment | 69,453 | 41,695
Ending balance | 1,382,915 | 1,254,797
Cost | Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 1,043,012 | 1,022,910
Additions | 68,633 | 46,289
Additions - business acquisitions | 65,561 | 2,341
Change in estimates and lease modifications | 25,972 | 18,422
Disposals/retirements | (98,942) | (81,524)
Foreign currency translation adjustment | 57,560 | 34,574
Ending balance | 1,161,796 | 1,043,012
Cost | Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 201,611 | 199,501
Additions | 53,803 | 41,968
Additions - business acquisitions | 935 | 0
Change in estimates and lease modifications | 0 | 0
Disposals/retirements | (52,781) | (46,014)
Foreign currency translation adjustment | 11,460 | 6,156
Ending balance | 215,028 | 201,611
Cost | Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 10,174 | 38,943
Additions | 1,428 | 208
Additions - business acquisitions | 0 | 0
Change in estimates and lease modifications | 0 | 0
Disposals/retirements | (5,944) | (29,942)
Foreign currency translation adjustment | 433 | 965
Ending balance | 6,091 | 10,174
Accumulated depreciation |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (788,682) | (779,033)
Disposals/retirements | 150,876 | 152,678
Foreign currency translation adjustment | (42,333) | (25,593)
Depreciation expense | 138,240 | 126,615
Impairment | 22,549 | 10,119
Ending balance | (840,928) | (788,682)
Accumulated depreciation | Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (683,857) | (644,021)
Disposals/retirements | 98,605 | 80,766
Foreign currency translation adjustment | (36,590) | (21,285)
Depreciation expense | 98,195 | 89,198
Impairment | 22,549 | 10,119
Ending balance | (742,586) | (683,857)
Accumulated depreciation | Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (95,723) | (98,800)
Disposals/retirements | 46,327 | 41,970
Foreign currency translation adjustment | (5,223) | (3,386)
Depreciation expense | 39,161 | 35,507
Impairment | 0 | 0
Ending balance | (93,780) | (95,723)
Accumulated depreciation | Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (9,102) | (36,212)
Disposals/retirements | 5,944 | 29,942
Foreign currency translation adjustment | (520) | (922)
Depreciation expense | 884 | 1,910
Impairment | 0 | 0
Ending balance | $ (4,562) | $ (9,102)

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- Definition The increase in right-of-use assets resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_53_h&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 115 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115_g&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 115 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115_g&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease in right-of-use assets resulting from disposals and retirements. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in right-of-use assets resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_53_j&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_47_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 115 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115_i&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 115 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115_i&doctype=Standard -URIDate 2025-03-27 + Details
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