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Employee benefits - Post-employment benefits plan (Details) - CAD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | $ (897,948) | $ (774,654)
Fair value of plan assets | 730,028 | 612,111
Surplus (deficit) in plan | (167,920) | (162,543)
Fair value of reimbursement rights | 19,675 | 19,458
Net asset (liability) recognized in the balance sheet | (148,245) | (143,085)
Retirement benefits assets | 22,446 | 836
Retirement benefits obligations | (190,366) | (163,379)
U.K. |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (620,308) | (535,633)
Fair value of plan assets | 642,538 | 536,226
Surplus (deficit) in plan | 22,230 | 593
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | 22,230 | 593
Retirement benefits assets | 22,230 | 593
Retirement benefits obligations | 0 | 0
France |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (95,366) | (78,612)
Fair value of plan assets | 0 | 0
Surplus (deficit) in plan | (95,366) | (78,612)
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | (95,366) | (78,612)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (95,366) | (78,612)
Germany |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (74,715) | (67,706)
Fair value of plan assets | 12,599 | 11,747
Surplus (deficit) in plan | (62,116) | (55,959)
Fair value of reimbursement rights | 19,300 | 19,082
Net asset (liability) recognized in the balance sheet | (42,816) | (36,877)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (62,116) | (55,959)
Other |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (107,559) | (92,703)
Fair value of plan assets | 74,891 | 64,138
Surplus (deficit) in plan | (32,668) | (28,565)
Fair value of reimbursement rights | 375 | 376
Net asset (liability) recognized in the balance sheet | (32,293) | (28,189)
Retirement benefits assets | 216 | 243
Retirement benefits obligations | $ (32,884) | $ (28,808)

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- Definition The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2024-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2024-en-r&anchor=para_35_a_i&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + 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 [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 140 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_b&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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