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Financial instruments - Fair value measurement of financial assets and liabilities (Details) - At fair value - CAD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial liabilities $ 197,727 $ 32,777
FVTE    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,694,100 1,806,999
FVOCI    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 272,294 250,684
Derivative financial assets 3,346 7,699
Cash and cash equivalents | FVTE | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 864,209 1,461,145
Cash included in funds held for clients (Note 5) | FVTE | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 704,503 233,584
Deferred compensation plan assets (Note 11) | FVTE | Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 125,388 112,270
Short-term investments included in current financial assets | FVOCI | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 3,675 3,279
Long-term bonds included in funds held for clients (Note 5) | FVOCI | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 240,932 223,196
Long-term investments (Note 11) | FVOCI | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 27,687 24,209
Cross-currency swaps | Current derivative financial instruments included in current financial assets | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial liabilities 3,036 0
Cross-currency swaps | Long-term derivative financial instruments (Note 11) | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial liabilities 136,155 9,500
Cross-currency swaps | Current derivative financial instruments included in current financial assets | FVOCI | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 1,011 0
Cross-currency swaps | Long-term derivative financial instruments (Note 11) | FVOCI | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 395 0
Foreign currency forward contracts | Current derivative financial instruments included in current financial assets | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial liabilities 21,586 13,073
Foreign currency forward contracts | Long-term derivative financial instruments (Note 11) | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial liabilities 36,950 10,204
Foreign currency forward contracts | Current derivative financial instruments included in current financial assets | FVOCI | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 1,481 5,055
Foreign currency forward contracts | Long-term derivative financial instruments (Note 11) | FVOCI | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets $ 459 $ 2,644