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Employee benefits - Post-employment benefits plan (Details) - CAD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | $ (851,271) | $ (897,948)
Fair value of plan assets | 707,712 | 730,028
Surplus (deficit) in plan | (143,559) | (167,920)
Fair value of reimbursement rights | 20,139 | 19,675
Net asset (liability) recognized in the balance sheet | (123,420) | (148,245)
Retirement benefits assets | 55,156 | 22,446
Retirement benefits obligations | (198,715) | (190,366)
U.K. |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (555,956) | (620,308)
Fair value of plan assets | 611,040 | 642,538
Surplus (deficit) in plan | 55,084 | 22,230
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | 55,084 | 22,230
Retirement benefits assets | 55,084 | 22,230
Retirement benefits obligations | 0 | 0
France |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (99,215) | (95,366)
Fair value of plan assets | 0 | 0
Surplus (deficit) in plan | (99,215) | (95,366)
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | (99,215) | (95,366)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (99,215) | (95,366)
GERMANY |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (77,086) | (74,715)
Fair value of plan assets | 13,254 | 12,599
Surplus (deficit) in plan | (63,832) | (62,116)
Fair value of reimbursement rights | 19,752 | 19,300
Net asset (liability) recognized in the balance sheet | (44,080) | (42,816)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (63,832) | (62,116)
Other |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (119,014) | (107,559)
Fair value of plan assets | 83,418 | 74,891
Surplus (deficit) in plan | (35,596) | (32,668)
Fair value of reimbursement rights | 387 | 375
Net asset (liability) recognized in the balance sheet | (35,209) | (32,293)
Retirement benefits assets | 72 | 216
Retirement benefits obligations | $ (35,668) | $ (32,884)

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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 2025-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2025-en-r&anchor=para_35_a_i&doctype=Standard -URIDate 2025-03-27 + 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 2025-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_57_a&doctype=Standard -URIDate 2025-03-27 + 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 2025-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_140_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 + 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 -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + 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 2025-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_57_a&doctype=Standard -URIDate 2025-03-27 + 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 2025-01-01 -Paragraph 140 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_140_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_b&doctype=Standard -URIDate 2025-03-27 + 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 2025-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_57_a&doctype=Standard -URIDate 2025-03-27 + Details
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