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Income taxes - Disclosure of the continuity of deferred tax balances (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ (35,680) | $ (44,857)
Additions from business acquisitions | (15,954) | (1,678)
Recognized in earnings | 7,496 | 25,934
Recognized in other comprehensive income | (8,358) | (20,619)
Recognized in equity | (7,194) | 6,137
Foreign currency translation adjustment and other | (11,921) | (597)
Ending balance | (71,611) | (35,680)
Accounts payable and accrued liabilities, provisions and other long-term liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 51,156 | 64,208
Additions from business acquisitions | 6,986 | (2,427)
Recognized in earnings | (20,232) | (7,553)
Recognized in other comprehensive income | 0 | (1)
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 2,304 | (3,071)
Ending balance | 40,214 | 51,156
Tax benefits on losses carried forward |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 43,181 | 46,228
Additions from business acquisitions | 1,489 | 4,654
Recognized in earnings | 9,450 | (6,284)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (2,157) | (1,417)
Ending balance | 51,963 | 43,181
Accrued compensation and employee-related liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 40,108 | 27,420
Additions from business acquisitions | 141 | 0
Recognized in earnings | 17,724 | 7,811
Recognized in other comprehensive income | 0 | 0
Recognized in equity | (7,194) | 6,137
Foreign currency translation adjustment and other | 357 | (1,260)
Ending balance | 51,136 | 40,108
Retirement benefits obligations |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 17,561 | 23,166
Additions from business acquisitions | 2,425 | 0
Recognized in earnings | (2,082) | 2,573
Recognized in other comprehensive income | 1,011 | (5,919)
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 602 | (2,259)
Ending balance | 19,517 | 17,561
Lease liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 179,318 | 222,997
Additions from business acquisitions | 1,577 | 0
Recognized in earnings | 252 | (36,103)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (10,075) | (7,576)
Ending balance | 171,072 | 179,318
PP&E, contract costs, intangible assets and other long-term assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (121,309) | (136,460)
Additions from business acquisitions | (27,347) | (3,905)
Recognized in earnings | 5,912 | 14,280
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (8,310) | 4,776
Ending balance | (151,054) | (121,309)
Right-of-use assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (134,808) | (171,835)
Additions from business acquisitions | (1,405) | 0
Recognized in earnings | (6,179) | 31,255
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 9,635 | 5,772
Ending balance | (132,757) | (134,808)
Work in progress |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (22,190) | (34,277)
Additions from business acquisitions | 0 | 0
Recognized in earnings | 9,018 | 11,139
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 344 | 948
Ending balance | (12,828) | (22,190)
Goodwill |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (70,845) | (64,209)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (5,619) | (10,493)
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | (5,153) | 3,857
Ending balance | (81,617) | (70,845)
Refundable tax credits on salaries |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (19,673) | (22,724)
Additions from business acquisitions | 0 | 0
Recognized in earnings | (376) | 3,051
Recognized in other comprehensive income | 0 | 0
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 0 | 0
Ending balance | (20,049) | (19,673)
Cash flow hedges |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (5,626) | (475)
Additions from business acquisitions | 0 | 0
Recognized in earnings | 4,333 | 675
Recognized in other comprehensive income | (9,146) | (6,157)
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 41 | 331
Ending balance | (10,398) | (5,626)
Other |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 7,447 | 1,104
Additions from business acquisitions | 180 | 0
Recognized in earnings | (4,705) | 15,583
Recognized in other comprehensive income | (223) | (8,542)
Recognized in equity | 0 | 0
Foreign currency translation adjustment and other | 491 | (698)
Ending balance | $ 3,190 | $ 7,447

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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 2021-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_90&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81&doctype=Standard -URIDate 2021-03-24 + Details
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