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Right-of-use assets (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | $ 482,321 |
Ending balance | 466,115 | $ 482,321
Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 378,889 |
Ending balance | 359,155 | 378,889
Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 100,701 |
Ending balance | 105,888 | 100,701
Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 2,731 |
Ending balance | 1,072 | 2,731
Cost |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 1,261,354 | 1,270,298
Additions | 88,465 | 82,685
Additions - business acquisitions | 2,341 |
Change in estimates and lease modifications | 18,422 | 13,940
Disposals/retirements | (157,480) | (141,583)
Foreign currency translation adjustment | 41,695 | 36,014
Ending balance | 1,254,797 | 1,261,354
Cost | Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 1,022,910 | 1,049,445
Additions | 46,289 | 32,772
Additions - business acquisitions | 2,341 |
Change in estimates and lease modifications | 18,422 | 13,940
Disposals/retirements | (81,524) | (101,670)
Foreign currency translation adjustment | 34,574 | 28,423
Ending balance | 1,043,012 | 1,022,910
Cost | Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 199,501 | 180,164
Additions | 41,968 | 48,883
Additions - business acquisitions | 0 |
Change in estimates and lease modifications | 0 | 0
Disposals/retirements | (46,014) | (36,792)
Foreign currency translation adjustment | 6,156 | 7,246
Ending balance | 201,611 | 199,501
Cost | Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 38,943 | 40,689
Additions | 208 | 1,030
Additions - business acquisitions | 0 |
Change in estimates and lease modifications | 0 | 0
Disposals/retirements | (29,942) | (3,121)
Foreign currency translation adjustment | 965 | 345
Ending balance | 10,174 | 38,943
Accumulated depreciation |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (779,033) | (735,177)
Disposals/retirements | 152,678 | 129,497
Foreign currency translation adjustment | (25,593) | (20,674)
Depreciation expense | 126,615 | 143,030
Impairment | 10,119 | 9,649
Ending balance | (788,682) | (779,033)
Accumulated depreciation | Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (644,021) | (610,007)
Disposals/retirements | 80,766 | 94,676
Foreign currency translation adjustment | (21,285) | (15,792)
Depreciation expense | 89,198 | 103,249
Impairment | 10,119 | 9,649
Ending balance | (683,857) | (644,021)
Accumulated depreciation | Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (98,800) | (88,923)
Disposals/retirements | 41,970 | 31,700
Foreign currency translation adjustment | (3,386) | (4,589)
Depreciation expense | 35,507 | 36,988
Impairment | 0 | 0
Ending balance | (95,723) | (98,800)
Accumulated depreciation | Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (36,212) | (36,247)
Disposals/retirements | 29,942 | 3,121
Foreign currency translation adjustment | (922) | (293)
Depreciation expense | 1,910 | 2,793
Impairment | 0 | 0
Ending balance | $ (9,102) | $ (36,212)

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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 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_h&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_a&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss for right-of-use assets. [Refer: Impairment loss recognised in profit or loss; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_j&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_a&doctype=Standard -URIDate 2024-03-27 + Details
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