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Income taxes - Disclosure of the continuity of deferred tax balances (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance $ 221,435 $ 74,351
Additions from business acquisitions (45,392) 0
Recognized in earnings (626) 146,100
Recognized in other comprehensive income (7,474) 1,556
Recognized in equity (5,811) (3,599)
Foreign currency translation adjustment and other 5,479 3,027
Ending balance 167,611 221,435
Accounts payable, accrued compensation and liabilities, provisions, and other long-term liabilities    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 132,021 112,599
Additions from business acquisitions 0 0
Recognized in earnings (13,894) 20,946
Recognized in other comprehensive income 0 0
Recognized in equity (5,811) (3,599)
Foreign currency translation adjustment and other 3,933 2,075
Ending balance 116,249 132,021
Tax benefits on losses carried forward    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 51,180 56,078
Additions from business acquisitions 0 0
Recognized in earnings 618 (7,265)
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other 2,164 2,367
Ending balance 53,962 51,180
Retirement benefits obligations    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 27,034 27,243
Additions from business acquisitions 0 0
Recognized in earnings 2,297 795
Recognized in other comprehensive income (13,062) (356)
Recognized in equity 0 0
Foreign currency translation adjustment and other 2,125 (648)
Ending balance 18,394 27,034
Capitalized research and development    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 174,467 92,880
Additions from business acquisitions 0 0
Recognized in earnings 18,545 82,302
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other 5,370 (715)
Ending balance 198,382 174,467
Lease liabilities    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 156,479 169,288
Additions from business acquisitions 4,360 0
Recognized in earnings (712) (16,919)
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other 7,925 4,110
Ending balance 168,052 156,479
PP&E, contract costs, intangible assets and other long-term assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (73,149) (123,717)
Additions from business acquisitions (44,860) 0
Recognized in earnings (4,353) 49,457
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other (4,801) 1,111
Ending balance (127,163) (73,149)
Right-of-use assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (123,982) (143,411)
Additions from business acquisitions (4,360) 0
Recognized in earnings 3,237 23,077
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other (6,800) (3,648)
Ending balance (131,905) (123,982)
Work in progress    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (15,621) (14,372)
Additions from business acquisitions 0 0
Recognized in earnings (3,593) (926)
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other (857) (323)
Ending balance (20,071) (15,621)
Goodwill    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (93,682) (87,259)
Additions from business acquisitions 0 0
Recognized in earnings (20,157) (6,346)
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other (2,949) (77)
Ending balance (116,788) (93,682)
Refundable tax credits on salaries    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (24,943) (22,568)
Additions from business acquisitions (532) 0
Recognized in earnings 6,257 (2,478)
Recognized in other comprehensive income 0 0
Recognized in equity 0 0
Foreign currency translation adjustment and other (25) 103
Ending balance (19,243) (24,943)
Cash flow and net investment      hedges    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 14,060 (4,010)
Additions from business acquisitions 0 0
Recognized in earnings 26 14,164
Recognized in other comprehensive income 5,873 5,374
Recognized in equity 0 0
Foreign currency translation adjustment and other 294 (1,468)
Ending balance 20,253 14,060
Other    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (2,429) 11,600
Additions from business acquisitions 0 0
Recognized in earnings 11,103 (10,707)
Recognized in other comprehensive income (285) (3,462)
Recognized in equity 0 0
Foreign currency translation adjustment and other (900) 140
Ending balance $ 7,489 $ (2,429)