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Financial instruments - Fair value measurement of financial assets and liabilities (Details) - At fair value - CAD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial liabilities $ 6,213 $ 12,190
FVTE    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,926,159 1,543,047
Derivative financial instruments designated as hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 163,380 117,123
Derivative financial assets 118,136 265,551
Cash and cash equivalents | FVTE | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,568,291 966,458
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 269,792 504,726
Deferred compensation plan assets (Note 11) | FVTE | Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 88,076 71,863
Short-term investments included in current financial assets | Derivative financial instruments designated as hedging instruments | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 7,332 6,184
Long-term bonds included in funds held for clients (Note 5) | Derivative financial instruments designated as hedging instruments | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 138,935 94,113
Long-term investments (Note 11) | Derivative financial instruments designated as hedging instruments | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 17,113 16,826
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 2,183 599
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 0 1,086
Cross-currency swaps | Current derivative financial instruments included in current financial assets | Derivative financial instruments designated as hedging instruments | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 83,626 8,740
Cross-currency swaps | Long-term derivative financial instruments (Note 11) | Derivative financial instruments designated as hedging instruments | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 16,130 222,246
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 2,330 5,710
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 1,700 4,795
Foreign currency forward contracts | Current derivative financial instruments included in current financial assets | Derivative financial instruments designated as hedging instruments | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 12,505 18,934
Foreign currency forward contracts | Long-term derivative financial instruments (Note 11) | Derivative financial instruments designated as hedging instruments | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets $ 5,875 $ 15,631