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Financial instruments - Narrative (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 3,267,034 $ 3,401,656
Settlement of derivative financial instruments 6,258 (6,992)
Cash and cash equivalents, funds held for clients, short-term investments and long-term investments 1,588,307 2,312,741
Available credit facility 1,495,730 1,493,372
Trade receivables 1,106,187 $ 938,417
Settled cross-currency swap agreement    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount $ 69,300  
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 $ 1,547,617  
Hedges of net investments in European operations | Cross-currency swaps in Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount 600,000  
Hedges of net investments in European operations | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Notional amount 1,547,680  
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 $ 6,258