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Income taxes - Disclosure of the continuity of deferred tax balances (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ 74,351 | $ (71,611)
Additions from business acquisitions | 0 | 2,540
Recognized in earnings | 146,100 | 109,496
Recognized in other comprehensive income | 1,556 | 28,862
Recognized in equity | (3,599) | 2,623
Foreign currency translation adjustment and other | 3,027 | 2,441
Ending balance | 221,435 | 74,351
Accounts payable and accrued liabilities, provisions and other long-term liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 43,673 | 40,214
Additions from business acquisitions | 0 | 0
Recognized in earnings | 8,844 | 4,007
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 683 | (548)
Ending balance | 53,200 | 43,673
Tax benefits on losses carried forward |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 56,078 | 51,963
Additions from business acquisitions | 0 | 0
Recognized in earnings | (7,265) | 2,928
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 2,367 | 1,187
Ending balance | 51,180 | 56,078
Accrued compensation and employee-related liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 68,926 | 51,136
Additions from business acquisitions | 0 | 0
Recognized in earnings | 12,102 | 14,531
Recognized in other comprehensive income | 0 | 0
Recognized in equity | (3,599) | 2,623
Foreign currency translation adjustment and other | 1,392 | 636
Ending balance | 78,821 | 68,926
Retirement benefits obligations |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 27,243 | 19,517
Additions from business acquisitions | 0 | 0
Recognized in earnings | 795 | (5,601)
Recognized in other comprehensive income | (356) | 13,078
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (648) | 249
Ending balance | 27,034 | 27,243
Capitalized research and development |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 92,880 | 0
Additions from business acquisitions | 0 | 0
Recognized in earnings | 82,302 | 92,880
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (715) | 0
Ending balance | 174,467 | 92,880
Lease liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 169,288 | 171,072
Additions from business acquisitions | 0 | 0
Recognized in earnings | (16,919) | (5,750)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 4,110 | 3,966
Ending balance | 156,479 | 169,288
PP&E, contract costs, intangible assets and other long-term assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (123,717) | (151,054)
Additions from business acquisitions | 0 | 2,540
Recognized in earnings | 49,457 | 23,567
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 1,111 | 1,230
Ending balance | (73,149) | (123,717)
Right-of-use assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (143,411) | (132,757)
Additions from business acquisitions | 0 | 0
Recognized in earnings | 23,077 | (6,709)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (3,648) | (3,945)
Ending balance | (123,982) | (143,411)
Work in progress |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (14,372) | (12,828)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (926) | (1,283)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (323) | (261)
Ending balance | (15,621) | (14,372)
Goodwill |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (87,259) | (81,617)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (6,346) | (6,653)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (77) | 1,011
Ending balance | (93,682) | (87,259)
Refundable tax credits on salaries |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (22,568) | (20,049)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (2,478) | (2,517)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 103 | (2)
Ending balance | (24,943) | (22,568)
Cash flow hedges |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (4,010) | (10,398)
Additions from business acquisitions | 0 | 0
Recognized in earnings | 14,164 | (55)
Recognized in other comprehensive income | 5,374 | 6,445
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (1,468) | (2)
Ending balance | 14,060 | (4,010)
Other |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 11,600 | 3,190
Additions from business acquisitions | 0 | 0
Recognized in earnings | (10,707) | 151
Recognized in other comprehensive income | (3,462) | 9,339
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 140 | (1,080)
Ending balance | $ (2,429) | $ 11,600

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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 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + 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 1 -IssueDate 2024-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_90&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81&doctype=Standard -URIDate 2024-03-27 + Details
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