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Employee benefits - Narrative (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
CAD ($)
plan
Sep. 30, 2021
CAD ($)
Disclosure of defined benefit plans [line items]    
Surplus in plan $ (107,974) $ (98,260)
Administration expenses paid from the plan 1,575 1,408
Current service cost 13,053 15,878
Annual contributions 7,257  
Pension cost for defined contribution plans 226,079 224,010
Deferred compensation plan liabilities 81,452 91,943
Deferred compensation plan assets (Notes 17 and 31) $ 71,863 81,633
U.K.    
Disclosure of defined benefit plans [line items]    
Number of defined benefit pension plans | plan 3  
Surplus in plan $ 46,647 105,351
Annual contributions 329  
Other    
Disclosure of defined benefit plans [line items]    
Surplus in plan (26,752) (45,119)
Annual contributions 6,928  
UNITED STATES    
Disclosure of defined benefit plans [line items]    
Deferred compensation plan assets (Notes 17 and 31) $ 71,863 81,245
CMG U.K. Pension Scheme | U.K.    
Disclosure of defined benefit plans [line items]    
Equity investments, target allocation percentage of plan assets 45.00%  
Surplus in plan $ 34,707  
Administration expenses paid from the plan $ 693  
Logica U.K. Pension & Life Assurance Scheme | U.K.    
Disclosure of defined benefit plans [line items]    
Equity investments, target allocation percentage of plan assets 15.00%  
Bond investments, target allocation percentage of plan assets 85.00%  
Surplus in plan $ 85  
Current service cost $ 314  
Logica Defined Benefit Pension Plan | U.K.    
Disclosure of defined benefit plans [line items]    
Equity investments, target allocation percentage of plan assets 15.00%  
Bond investments, target allocation percentage of plan assets 85.00%  
Surplus in plan $ 17,819  
Alecta multi-employer plan    
Disclosure of defined benefit plans [line items]    
Annual contributions 20,131  
Pension cost for defined contribution plans $ 29,539 $ 31,807
Proportion of total contributions to the plan 0.48%  
Proportion of total number of active members in the plan 0.47%  
Collective funding solvency percentage 189.00% 169.00%
Alecta multi-employer plan | Minimum    
Disclosure of defined benefit plans [line items]    
Collective funding solvency allowed 125.00%  
Alecta multi-employer plan | Maximum    
Disclosure of defined benefit plans [line items]    
Collective funding solvency allowed 175.00%