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Financial instruments - Fair value measurement of financial assets and liabilities (Details) - At fair value - CAD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial liabilities $ 12,190 $ 48,281
FVTE    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,543,047 2,237,364
Derivative financial instruments designated as hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 117,123 157,010
Derivative financial assets 265,551 51,512
Cash and cash equivalents | FVTE | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 966,458 1,699,206
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 504,726 456,525
Deferred compensation plan assets (Note 11) | FVTE | Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 71,863 81,633
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 6,184 1,027
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 94,113 136,629
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 16,826 19,354
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 0 5,762
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 1,685 39,918
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 8,740 4,146
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 222,246 24,347
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 5,710 735
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 4,795 1,866
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 18,934 12,745
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 15,631 9,231
Interest rate 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 $ 0 $ 1,043