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Financial instruments - Narrative (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 3,100,321,000 $ 3,267,034,000
Settlement of derivative financial instruments 2,921,000 6,258,000
Cash and cash equivalents, funds held for clients, short-term investments and long-term investments 2,081,463,000 1,588,307,000
Available credit facility 1,495,858,000 1,495,730,000
Trade receivables 1,152,880,000 $ 1,106,187,000
Settled cross-currency swap agreement    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount of financial liabilities $ 69,300,000  
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%  
Senior U.S. Unsecured Notes [Member] | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 1,525,519,000  
Hedges of net investments in European operations | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount of financial liabilities 1,536,563,000  
At fair value | Settled cross-currency swap agreement    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Settlement of derivative financial instruments $ 2,921,000