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Employee benefits - Post-employment benefits plan (Details) - CAD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | $ (724,527) | $ (1,134,554)
Fair value of plan assets | 616,553 | 1,036,294
Surplus (deficit) in plan | (107,974) | (98,260)
Fair value of reimbursement rights | 18,877 | 21,250
Net asset (liability) recognized in the balance sheet | (89,097) | (77,010)
Retirement benefits assets | 47,071 | 106,228
Retirement benefits obligations | (155,045) | (204,488)
U.K. |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (525,262) | (881,008)
Fair value of plan assets | 571,909 | 986,359
Surplus (deficit) in plan | 46,647 | 105,351
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | 46,647 | 105,351
Retirement benefits assets | 46,647 | 105,351
Retirement benefits obligations | 0 | 0
France |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (77,477) | (77,006)
Fair value of plan assets | 0 | 661
Surplus (deficit) in plan | (77,477) | (76,345)
Fair value of reimbursement rights | 0 | 0
Net asset (liability) recognized in the balance sheet | (77,477) | (76,345)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (77,477) | (76,345)
Germany |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (61,420) | (94,381)
Fair value of plan assets | 11,028 | 12,234
Surplus (deficit) in plan | (50,392) | (82,147)
Fair value of reimbursement rights | 18,495 | 20,823
Net asset (liability) recognized in the balance sheet | (31,897) | (61,324)
Retirement benefits assets | 0 | 0
Retirement benefits obligations | (50,392) | (82,147)
Other |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligations | (60,368) | (82,159)
Fair value of plan assets | 33,616 | 37,040
Surplus (deficit) in plan | (26,752) | (45,119)
Fair value of reimbursement rights | 382 | 427
Net asset (liability) recognized in the balance sheet | (26,370) | (44,692)
Retirement benefits assets | 424 | 877
Retirement benefits obligations | $ (27,176) | $ (45,996)

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- Definition The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2021-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2021-en-r&anchor=para_35_a_i&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard -URIDate 2021-03-24 + 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 -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 140 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_b&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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