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Employee benefits - Post-employment benefits plan (Details) - CAD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | $ (774,654) | $ (749,943)
Fair value of plan assets | 612,111 | 641,969
Surplus (deficit) in plan | (162,543) | (107,974)
Fair value of reimbursement rights | 19,458 | 18,877
Net asset (liability) recognized in the balance sheet | (143,085) | (89,097)
Retirement benefits assets | 836 | 47,071
Retirement benefits obligations | (163,379) | (155,045)
U.K. |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (535,633) | (525,262)
Fair value of plan assets | 536,226 | 571,909
Surplus (deficit) in plan | 593 | 46,647
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | 593 | 46,647
Retirement benefits assets | 593 | 46,647
Retirement benefits obligations | 0 | 0
France |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (78,612) | (77,477)
Fair value of plan assets | 0 | 0
Surplus (deficit) in plan | (78,612) | (77,477)
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | (78,612) | (77,477)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (78,612) | (77,477)
Germany |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (67,706) | (61,420)
Fair value of plan assets | 11,747 | 11,028
Surplus (deficit) in plan | (55,959) | (50,392)
Fair value of reimbursement rights | 19,082 | 18,495
Net asset (liability) recognized in the balance sheet | (36,877) | (31,897)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (55,959) | (50,392)
Other |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (92,703) | (85,784)
Fair value of plan assets | 64,138 | 59,032
Surplus (deficit) in plan | (28,565) | (26,752)
Fair value of reimbursement rights | 376 | 382
Net asset (liability) recognized in the balance sheet | (28,189) | (26,370)
Retirement benefits assets | 243 | 424
Retirement benefits obligations | $ (28,808) | $ (27,176)

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- Definition The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2023-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2023-en-r&anchor=para_35_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of the entity's rights to the reimbursement by another party of some or all of the expenditure required to settle a defined benefit obligation recognised as a separate asset and measured at fair value. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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