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Employee benefits - Defined benefit obligations (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | $ 77,010 |
Current service cost | 13,053 | $ 15,878
Interest cost | 51 | 1,005
Past service cost | 0 | 346
Defined benefit liability (asset), ending balance | 89,097 | 77,010
U.K. |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | (105,351) |
Defined benefit liability (asset), ending balance | (46,647) | (105,351)
France |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 76,345 |
Defined benefit liability (asset), ending balance | 77,477 | 76,345
Germany |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 61,324 |
Defined benefit liability (asset), ending balance | 31,897 | 61,324
Other |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 44,692 |
Defined benefit liability (asset), ending balance | 26,370 | 44,692
Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 1,134,554 | 1,163,744
Current service cost | 13,053 | 15,878
Interest cost | 21,133 | 17,528
Business acquisitions | 10,192 |
Past service cost |  | 346
Actuarial losses (gains) due to change in financial assumptions | (342,078) | 16,474
Actuarial losses (gains) due to change in demographic assumptions | 8,283 |
Actuarial (gains) losses due to experience | 22,255 | (13,530)
Plan participant contributions | 80 | 92
Benefits paid from the plan | (31,708) | (34,510)
Benefits paid directly by employer | (5,032) | (7,688)
Foreign currency translation adjustment | (94,211) | (23,780)
Other | (11,994) |
Defined benefit liability (asset), ending balance | 724,527 | 1,134,554
Present value of defined benefit obligation | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 117,497 |
Defined benefit liability (asset), ending balance | 96,306 | 117,497
Present value of defined benefit obligation | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 1,017,057 |
Defined benefit liability (asset), ending balance | 628,221 | 1,017,057
Present value of defined benefit obligation | U.K. |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 881,008 | 891,628
Current service cost | 1,114 | 1,114
Interest cost | 16,877 | 13,490
Business acquisitions | 0 |
Past service cost |  | 346
Actuarial losses (gains) due to change in financial assumptions | (285,653) | 21,722
Actuarial losses (gains) due to change in demographic assumptions | 7,882 |
Actuarial (gains) losses due to experience | 4,081 | (9,994)
Plan participant contributions | 80 | 92
Benefits paid from the plan | (24,018) | (29,936)
Benefits paid directly by employer | 0 | 0
Foreign currency translation adjustment | (76,109) | (7,454)
Other | 0 |
Defined benefit liability (asset), ending balance | 525,262 | 881,008
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 | 881,008 |
Defined benefit liability (asset), ending balance | 525,262 | 881,008
Present value of defined benefit obligation | France |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 77,006 | 84,442
Current service cost | 5,673 | 6,004
Interest cost | 740 | 529
Business acquisitions | 10,192 |
Past service cost |  | 0
Actuarial losses (gains) due to change in financial assumptions | (20,586) | (2,922)
Actuarial losses (gains) due to change in demographic assumptions | 921 |
Actuarial (gains) losses due to experience | 12,112 | (3,498)
Plan participant contributions | 0 | 0
Benefits paid from the plan | (622) | 0
Benefits paid directly by employer | (1,318) | (2,492)
Foreign currency translation adjustment | (6,641) | (5,057)
Other | 0 |
Defined benefit liability (asset), ending balance | 77,477 | 77,006
Present value of defined benefit obligation | France | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 77,006 |
Defined benefit liability (asset), ending balance | 77,477 | 77,006
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 | 94,381 | 104,090
Current service cost | 531 | 665
Interest cost | 768 | 642
Business acquisitions | 0 |
Past service cost |  | 0
Actuarial losses (gains) due to change in financial assumptions | (25,735) | (1,201)
Actuarial losses (gains) due to change in demographic assumptions | 0 |
Actuarial (gains) losses due to experience | 2,214 | 521
Plan participant contributions | 0 | 0
Benefits paid from the plan | (647) | (1,053)
Benefits paid directly by employer | (2,848) | (2,954)
Foreign currency translation adjustment | (7,244) | (6,329)
Other | 0 |
Defined benefit liability (asset), ending balance | 61,420 | 94,381
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 | 94,381 |
Defined benefit liability (asset), ending balance | 61,420 | 94,381
Present value of defined benefit obligation | Other |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 82,159 | 83,584
Current service cost | 5,735 | 8,095
Interest cost | 2,748 | 2,867
Business acquisitions | 0 |
Past service cost |  | 0
Actuarial losses (gains) due to change in financial assumptions | (10,104) | (1,125)
Actuarial losses (gains) due to change in demographic assumptions | (520) |
Actuarial (gains) losses due to experience | 3,848 | (559)
Plan participant contributions | 0 | 0
Benefits paid from the plan | (6,421) | (3,521)
Benefits paid directly by employer | (866) | (2,242)
Foreign currency translation adjustment | (4,217) | (4,940)
Other | (11,994) |
Defined benefit liability (asset), ending balance | 60,368 | 82,159
Present value of defined benefit obligation | Other | Unfunded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 40,491 |
Defined benefit liability (asset), ending balance | 18,829 | 40,491
Present value of defined benefit obligation | Other | Funded Plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability (asset), beginning balance | 41,668 |
Defined benefit liability (asset), ending balance | $ 41,539 | $ 41,668

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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 2021-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_f&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_h&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_e&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_d&doctype=Standard -URIDate 2021-03-24 + Details
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