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Employee benefits - Fair value of plan assets (Details) - CAD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Quoted equities | $ 196,682 | $ 260,103
Quoted bonds | 159,475 | 158,739
Cash | 22,877 | 3,191
Other | 328,678 | 307,995
Plan assets | 707,712 | 730,028
U.K. |  |
Disclosure of fair value of plan assets [line items] |  |
Quoted equities | 196,682 | 260,103
Quoted bonds | 159,475 | 158,739
Cash | 22,811 | 3,123
Other | 232,072 | 220,573
Plan assets | 611,040 | 642,538
GERMANY |  |
Disclosure of fair value of plan assets [line items] |  |
Quoted equities | 0 | 0
Quoted bonds | 0 | 0
Cash | 0 | 0
Other | 13,254 | 12,599
Plan assets | 13,254 | 12,599
Other |  |
Disclosure of fair value of plan assets [line items] |  |
Quoted equities | 0 | 0
Quoted bonds | 0 | 0
Cash | 66 | 68
Other | 83,352 | 74,823
Plan assets | $ 83,418 | $ 74,891

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- Definition The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 142 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_142_c&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 208 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_208_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 208 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_208_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 142 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_142_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 208 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_208_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 208 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_208_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 142 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_142&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 208 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_208_d&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 208 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_208_d&doctype=Standard -URIDate 2025-03-27 + Details
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