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Financial instruments - Narrative (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 2,688,308,000 $ 3,100,321,000
Cash and cash equivalents, funds held for clients, short-term investments and long-term investments 1,995,413,000 2,081,463,000
Available credit facility 1,496,355,000 1,495,858,000
Trade receivables 1,117,712,000 1,152,880,000
Cross-Currency Swap Agreeement Between Canadian Dollar And Euro [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount of financial liabilities 670,000,000  
Cross-currency swaps in Swedish krona    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount of financial liabilities 80,000,000  
Settled cross-currency swap agreement    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount of financial liabilities 954,832,000  
Net gain on settlement of derivatives 38,943,000  
Net gain on settlement of cash flow hedge, profit or loss 7,811,000  
Net gain on settlement of net investment hedge. other comprehensive income 31,132,000  
Unsecured committed term loan credit facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings 0 676,886,000
2021 U.S. Senior Notes    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 1,342,758,000 $ 1,342,714,000
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent 1.00%  
Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent 10.00%  
Currency risk | Hedges of net investments in European operations    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount of financial liabilities $ 1,351,500,000  
Currency risk | 2021 U.S. Senior Notes    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 1,342,758,000