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Right-of-use assets (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | $ 586,207 |
Ending balance | 535,121 | $ 586,207
Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 474,309 |
Ending balance | 439,438 | 474,309
Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 106,379 |
Ending balance | 91,241 | 106,379
Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 5,519 |
Ending balance | 4,442 | 5,519
Cost |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 1,294,314 | 1,399,199
Additions | 120,067 | 83,101
Additions - business acquisitions | 22,114 | 4,982
Change in estimates and lease modifications | (7,946) | 33,774
Disposals/retirements | (100,250) | (174,746)
Foreign currency translation adjustment | (58,001) | (51,996)
Ending balance | 1,270,298 | 1,294,314
Cost | Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 1,080,867 | 1,124,258
Additions | 90,830 | 60,318
Additions - business acquisitions | 21,622 | 4,982
Change in estimates and lease modifications | (7,946) | 33,774
Disposals/retirements | (88,546) | (99,373)
Foreign currency translation adjustment | (47,382) | (43,092)
Ending balance | 1,049,445 | 1,080,867
Cost | Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 174,354 | 233,976
Additions | 25,554 | 21,955
Additions - business acquisitions | 492 | 0
Change in estimates and lease modifications | 0 | 0
Disposals/retirements | (11,704) | (73,190)
Foreign currency translation adjustment | (8,532) | (8,387)
Ending balance | 180,164 | 174,354
Cost | Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | 39,093 | 40,965
Additions | 3,683 | 828
Additions - business acquisitions | 0 | 0
Change in estimates and lease modifications | 0 | 0
Disposals/retirements | 0 | (2,183)
Foreign currency translation adjustment | (2,087) | (517)
Ending balance | 40,689 | 39,093
Accumulated depreciation |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (708,107) | (732,334)
Disposals/retirements | 82,722 | 157,204
Foreign currency translation adjustment | 35,361 | 28,730
Depreciation expense (Note 24) | 141,295 | 160,240
Impairment (Note 24) | 3,858 | 1,467
Ending balance | (735,177) | (708,107)
Accumulated depreciation | Properties |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (606,558) | (605,155)
Disposals/retirements | 74,973 | 87,557
Foreign currency translation adjustment | 28,925 | 24,406
Depreciation expense (Note 24) | 103,489 | 111,899
Impairment (Note 24) | 3,858 | 1,467
Ending balance | (610,007) | (606,558)
Accumulated depreciation | Motor vehicles and others |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (67,975) | (97,573)
Disposals/retirements | 7,749 | 67,464
Foreign currency translation adjustment | 4,563 | 3,900
Depreciation expense (Note 24) | 33,260 | 41,766
Impairment (Note 24) | 0 | 0
Ending balance | (88,923) | (67,975)
Accumulated depreciation | Computer equipment |  |
Reconciliation Of Changes In Right-Of-Use Assets [Abstract] |  |
Beginning balance | (33,574) | (29,606)
Disposals/retirements | 0 | 2,183
Foreign currency translation adjustment | 1,873 | 424
Depreciation expense (Note 24) | 4,546 | 6,575
Impairment (Note 24) | 0 | 0
Ending balance | $ (36,247) | $ (33,574)

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- Definition Change In Estimates And Lease Modifications, Right-Of-Use Assets + References No definition available. + 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 2021-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_h&doctype=Standard -URIDate 2021-03-24 + 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. 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 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard -URIDate 2021-03-24 + Details
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