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Amortization, depreciation and impairment (Details) - CAD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Disclosure of attribution of expenses by nature to their function [abstract] |  |
Included in costs of services, selling and administrative | $ 519,648,000 | $ 474,622,000
Amortization of contract costs related to incentives (presented as a reduction of revenue) | 2,793,000 | 2,201,000
Amortization of deferred financing fees (presented in finance costs) | 816,000 | 829,000
Amortization of premiums and discounts on investments related to funds held for clients (presented net as a reduction (increase) of revenue) | (1,832,000) | 37,000
Costs of services, selling and administrative |  |
Disclosure of attribution of expenses by nature to their function [abstract] |  |
Depreciation of PP&E | 142,653,000 | 133,651,000
Depreciation of right-of-use assets | 143,030,000 | 141,295,000
Impairment | 2,274,000 | 1,495,000
Amortization of contract costs related to transition costs | 55,194,000 | 48,594,000
Amortization expense | 162,971,000 | 139,940,000
Impairment | 0 | 3,359,000
Included in costs of services, selling and administrative | 506,122,000 | 468,334,000
Integration costs |  |
Disclosure of attribution of expenses by nature to their function [abstract] |  |
Depreciation of PP&E | 712,000 | 0
Impairment | 5,143,000 | 2,363,000
Amortization expense | 1,076,000 | 0
Impairment loss recognised in profit or loss, property, plant and equipment | 648,000 | 858,000
Cost optimization program |  |
Disclosure of attribution of expenses by nature to their function [abstract] |  |
Impairment | 2,232,000 | 0
Impairment loss recognised in profit or loss, property, plant and equipment | $ 1,938,000 | $ 0

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- Definition Amortisation, Assets Recognised From Costs Incurred To Obtain Or Fulfil Contracts With Customers, Transaction Costs + References No definition available. + Details
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- Definition Amortization Of Premiums (Discounts) On Investments Related To Funds Held For Clients + References No definition available. + Details
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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of depreciation expense, amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss. [Refer: Depreciation and amortisation expense; Impairment loss (reversal of impairment loss) recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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