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Employee benefits - Defined benefit obligations (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | $ 143,085 |
Current service cost | 14,165 | $ 13,734
Interest cost | 6,101 | 2,998
Past service cost | 0 | (288)
Defined benefit liability (asset), ending balance | 148,245 | 143,085
U.K. |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | (593) |
Defined benefit liability (asset), ending balance | (22,230) | (593)
France |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 78,612 |
Defined benefit liability (asset), ending balance | 95,366 | 78,612
Germany |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 36,877 |
Defined benefit liability (asset), ending balance | 42,816 | 36,877
Other |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 28,189 |
Defined benefit liability (asset), ending balance | 32,293 | 28,189
Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 774,654 | 749,943
Current service cost | 14,165 | 13,733
Interest cost | 41,686 | 37,552
Past service cost |  | (288)
Actuarial losses (gains) due to change in financial assumptions | 47,885 | (60,689)
Actuarial losses (gains) due to change in demographic assumptions | 449 | (11,987)
Actuarial (gains) losses due to experience | (6,315) | 33,381
Plan participant contributions | 248 | 246
Benefits paid from the plan | (31,751) | (31,115)
Benefits paid directly by employer | (5,721) | (6,304)
Foreign currency translation adjustment | 62,648 | (50,182)
Defined benefit liability (asset), ending balance | 897,948 | 774,654
Present value of defined benefit obligation | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 96,744 |
Defined benefit liability (asset), ending balance | 116,966 | 96,744
Present value of defined benefit obligation | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 677,910 |
Defined benefit liability (asset), ending balance | 780,982 | 677,910
Present value of defined benefit obligation | U.K. |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 535,633 | 525,262
Current service cost | 946 | 997
Interest cost | 30,561 | 27,445
Past service cost |  | 0
Actuarial losses (gains) due to change in financial assumptions | 29,444 | (54,598)
Actuarial losses (gains) due to change in demographic assumptions | 0 | (12,077)
Actuarial (gains) losses due to experience | (1,222) | 33,349
Plan participant contributions | 86 | 76
Benefits paid from the plan | (27,712) | (26,527)
Benefits paid directly by employer | 0 | 0
Foreign currency translation adjustment | 52,572 | (41,706)
Defined benefit liability (asset), ending balance | 620,308 | 535,633
Present value of defined benefit obligation | U.K. | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 0 |
Defined benefit liability (asset), ending balance | 0 | 0
Present value of defined benefit obligation | U.K. | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 535,633 |
Defined benefit liability (asset), ending balance | 620,308 | 535,633
Present value of defined benefit obligation | France |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 78,612 | 77,477
Current service cost | 6,114 | 6,106
Interest cost | 3,378 | 3,093
Past service cost |  | (288)
Actuarial losses (gains) due to change in financial assumptions | 10,088 | (4,575)
Actuarial losses (gains) due to change in demographic assumptions | 111 | 88
Actuarial (gains) losses due to experience | (5,100) | (6,035)
Plan participant contributions | 0 | 0
Benefits paid from the plan | 0 | 0
Benefits paid directly by employer | (2,033) | (2,565)
Foreign currency translation adjustment | 4,196 | (5,311)
Defined benefit liability (asset), ending balance | 95,366 | 78,612
Present value of defined benefit obligation | France | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 78,612 |
Defined benefit liability (asset), ending balance | 95,366 | 78,612
Present value of defined benefit obligation | France | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 0 |
Defined benefit liability (asset), ending balance | 0 | 0
Present value of defined benefit obligation | Germany |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 67,706 | 61,420
Current service cost | 373 | 379
Interest cost | 2,738 | 2,600
Past service cost |  | 0
Actuarial losses (gains) due to change in financial assumptions | 4,948 | 65
Actuarial losses (gains) due to change in demographic assumptions | 0 | 0
Actuarial (gains) losses due to experience | (787) | 2,571
Plan participant contributions | 0 | 0
Benefits paid from the plan | (503) | (229)
Benefits paid directly by employer | (3,192) | (2,992)
Foreign currency translation adjustment | 3,432 | (3,892)
Defined benefit liability (asset), ending balance | 74,715 | 67,706
Present value of defined benefit obligation | Germany | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 0 |
Defined benefit liability (asset), ending balance | 0 | 0
Present value of defined benefit obligation | Germany | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 67,706 |
Defined benefit liability (asset), ending balance | 74,715 | 67,706
Present value of defined benefit obligation | Other |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 92,703 | 85,784
Current service cost | 6,732 | 6,251
Interest cost | 5,009 | 4,414
Past service cost |  | 0
Actuarial losses (gains) due to change in financial assumptions | 3,405 | (1,581)
Actuarial losses (gains) due to change in demographic assumptions | 338 | 2
Actuarial (gains) losses due to experience | 794 | 3,496
Plan participant contributions | 162 | 170
Benefits paid from the plan | (3,536) | (4,359)
Benefits paid directly by employer | (496) | (747)
Foreign currency translation adjustment | 2,448 | 727
Defined benefit liability (asset), ending balance | 107,559 | 92,703
Present value of defined benefit obligation | Other | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 18,132 |
Defined benefit liability (asset), ending balance | 21,600 | 18,132
Present value of defined benefit obligation | Other | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 74,571 |
Defined benefit liability (asset), ending balance | $ 85,959 | $ 74,571

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_b&doctype=Standard -URIDate 2024-03-27 + 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 increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_d&doctype=Standard -URIDate 2024-03-27 + Details
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