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Income taxes - Disclosure of the continuity of deferred tax balances (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ (71,611) | $ (35,680)
Additions from business acquisitions | 2,540 | (15,954)
Recognized in earnings | 109,496 | 7,496
Recognized in other comprehensive income | 28,862 | (8,358)
Recognized in equity | 2,623 | (7,194)
Foreign currency translation adjustment and other | 2,441 | (11,921)
Ending balance | 74,351 | (71,611)
Accounts payable and accrued liabilities, provisions and other long-term liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 40,214 | 51,156
Additions from business acquisitions | 0 | 6,986
Recognized in earnings | 4,007 | (20,232)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (548) | 2,304
Ending balance | 43,673 | 40,214
Tax benefits on losses carried forward |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 51,963 | 43,181
Additions from business acquisitions | 0 | 1,489
Recognized in earnings | 2,928 | 9,450
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 1,187 | (2,157)
Ending balance | 56,078 | 51,963
Accrued compensation and employee-related liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 51,136 | 40,108
Additions from business acquisitions | 0 | 141
Recognized in earnings | 14,531 | 17,724
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 2,623 | (7,194)
Foreign currency translation adjustment and other | 636 | 357
Ending balance | 68,926 | 51,136
Retirement benefits obligations |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 19,517 | 17,561
Additions from business acquisitions | 0 | 2,425
Recognized in earnings | (5,601) | (2,082)
Recognized in other comprehensive income | 13,078 | 1,011
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 249 | 602
Ending balance | 27,243 | 19,517
Capitalized research and development |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance |  |
Additions from business acquisitions | 0 |
Recognized in earnings | 92,880 |
Recognized in other comprehensive income | 0 |
Recognized in equity | 0 |
Foreign currency translation adjustment and other | 0 |
Ending balance | 92,880 |
Lease liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 171,072 | 179,318
Additions from business acquisitions | 0 | 1,577
Recognized in earnings | (5,750) | 252
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 3,966 | (10,075)
Ending balance | 169,288 | 171,072
PP&E, contract costs, intangible assets and other long-term assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (151,054) | (121,309)
Additions from business acquisitions | 2,540 | (27,347)
Recognized in earnings | 23,567 | 5,912
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 1,230 | (8,310)
Ending balance | (123,717) | (151,054)
Right-of-use assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (132,757) | (134,808)
Additions from business acquisitions | 0 | (1,405)
Recognized in earnings | (6,709) | (6,179)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (3,945) | 9,635
Ending balance | (143,411) | (132,757)
Work in progress |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (12,828) | (22,190)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (1,283) | 9,018
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (261) | 344
Ending balance | (14,372) | (12,828)
Goodwill |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (81,617) | (70,845)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (6,653) | (5,619)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 1,011 | (5,153)
Ending balance | (87,259) | (81,617)
Refundable tax credits on salaries |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (20,049) | (19,673)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (2,517) | (376)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (2) | 0
Ending balance | (22,568) | (20,049)
Cash flow hedges |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (10,398) | (5,626)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (55) | 4,333
Recognized in other comprehensive income | 6,445 | (9,146)
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (2) | 41
Ending balance | (4,010) | (10,398)
Other |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 3,190 | 7,447
Additions from business acquisitions | 0 | 180
Recognized in earnings | 151 | (4,705)
Recognized in other comprehensive income | 9,339 | (223)
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (1,080) | 491
Ending balance | $ 11,600 | $ 3,190

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_90&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81&doctype=Standard -URIDate 2023-03-23 + Details
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