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Employee benefits - Defined benefit obligations (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | $ 89,097 |
Current service cost | 13,734 | $ 13,053
Interest cost | 2,998 | 51
Past service cost | (288) | 0
Defined benefit liability (asset), ending balance | 143,085 | 89,097
U.K. |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | (46,647) |
Defined benefit liability (asset), ending balance | (593) | (46,647)
France |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 77,477 |
Defined benefit liability (asset), ending balance | 78,612 | 77,477
Germany |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 31,897 |
Defined benefit liability (asset), ending balance | 36,877 | 31,897
Other |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 26,370 |
Defined benefit liability (asset), ending balance | 28,189 | 26,370
Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 749,943 | 1,160,956
Current service cost | 13,733 | 13,053
Interest cost | 37,552 | 21,354
Past service cost | (288) |
Business acquisitions |  | 10,192
Actuarial losses (gains) due to change in financial assumptions | (60,689) | (342,078)
Actuarial losses (gains) due to change in demographic assumptions | (11,987) | 8,283
Actuarial (gains) losses due to experience | 33,381 | 23,089
Plan participant contributions | 246 | 266
Benefits paid from the plan | (31,115) | (31,708)
Benefits paid directly by employer | (6,304) | (5,032)
Foreign currency translation adjustment | 50,182 | (96,438)
Other |  | (11,994)
Defined benefit liability (asset), ending balance | 774,654 | 749,943
Present value of defined benefit obligation | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 96,306 |
Defined benefit liability (asset), ending balance | 96,744 | 96,306
Present value of defined benefit obligation | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 653,637 |
Defined benefit liability (asset), ending balance | 677,910 | 653,637
Present value of defined benefit obligation | U.K. |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 525,262 | 881,008
Current service cost | 997 | 1,114
Interest cost | 27,445 | 16,877
Past service cost | 0 |
Business acquisitions |  | 0
Actuarial losses (gains) due to change in financial assumptions | (54,598) | (285,653)
Actuarial losses (gains) due to change in demographic assumptions | (12,077) | 7,882
Actuarial (gains) losses due to experience | 33,349 | 4,081
Plan participant contributions | 76 | 80
Benefits paid from the plan | (26,527) | (24,018)
Benefits paid directly by employer | 0 | 0
Foreign currency translation adjustment | 41,706 | (76,109)
Other |  | 0
Defined benefit liability (asset), ending balance | 535,633 | 525,262
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 | 525,262 |
Defined benefit liability (asset), ending balance | 535,633 | 525,262
Present value of defined benefit obligation | France |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 77,477 | 77,006
Current service cost | 6,106 | 5,673
Interest cost | 3,093 | 740
Past service cost | (288) |
Business acquisitions |  | 10,192
Actuarial losses (gains) due to change in financial assumptions | (4,575) | (20,586)
Actuarial losses (gains) due to change in demographic assumptions | 88 | 921
Actuarial (gains) losses due to experience | (6,035) | 12,112
Plan participant contributions | 0 | 0
Benefits paid from the plan | 0 | (622)
Benefits paid directly by employer | (2,565) | (1,318)
Foreign currency translation adjustment | 5,311 | (6,641)
Other |  | 0
Defined benefit liability (asset), ending balance | 78,612 | 77,477
Present value of defined benefit obligation | France | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 77,477 |
Defined benefit liability (asset), ending balance | 78,612 | 77,477
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 | 61,420 | 94,381
Current service cost | 379 | 531
Interest cost | 2,600 | 768
Past service cost | 0 |
Business acquisitions |  | 0
Actuarial losses (gains) due to change in financial assumptions | 65 | (25,735)
Actuarial losses (gains) due to change in demographic assumptions | 0 | 0
Actuarial (gains) losses due to experience | 2,571 | 2,214
Plan participant contributions | 0 | 0
Benefits paid from the plan | (229) | (647)
Benefits paid directly by employer | (2,992) | (2,848)
Foreign currency translation adjustment | 3,892 | (7,244)
Other |  | 0
Defined benefit liability (asset), ending balance | 67,706 | 61,420
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 | 61,420 |
Defined benefit liability (asset), ending balance | 67,706 | 61,420
Present value of defined benefit obligation | Other |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 85,784 | 108,561
Current service cost | 6,251 | 5,735
Interest cost | 4,414 | 2,969
Past service cost | 0 |
Business acquisitions |  | 0
Actuarial losses (gains) due to change in financial assumptions | (1,581) | (10,104)
Actuarial losses (gains) due to change in demographic assumptions | 2 | (520)
Actuarial (gains) losses due to experience | 3,496 | 4,682
Plan participant contributions | 170 | 186
Benefits paid from the plan | (4,359) | (6,421)
Benefits paid directly by employer | (747) | (866)
Foreign currency translation adjustment | (727) | (6,444)
Other |  | (11,994)
Defined benefit liability (asset), ending balance | 92,703 | 85,784
Present value of defined benefit obligation | Other | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 18,829 |
Defined benefit liability (asset), ending balance | 18,132 | 18,829
Present value of defined benefit obligation | Other | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 66,955 |
Defined benefit liability (asset), ending balance | $ 74,571 | $ 66,955

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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 2023-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c&doctype=Standard -URIDate 2023-03-23 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_h&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_e&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_b&doctype=Standard -URIDate 2023-03-23 + 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 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_d&doctype=Standard -URIDate 2023-03-23 + Details
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