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Employee benefits - Narrative (Details)
 12 Months Ended
Sep. 30, 2023
CAD ($)
plan
Sep. 30, 2022
CAD ($)
Disclosure of defined benefit plans [line items]    
Surplus in plan $ (162,543,000) $ (107,974,000)
Current service cost 13,734,000 13,053,000
Annual contributions 7,574,000  
Pension cost for defined contribution plans 282,284,000 241,405,000
Deferred compensation plan liabilities 97,745,000 81,452,000
Deferred compensation plan assets $ 88,076,000 71,863,000
U.K.    
Disclosure of defined benefit plans [line items]    
Number of defined benefit pension plans | plan 3  
Surplus in plan $ 593,000 46,647,000
Annual contributions 377,000  
Other    
Disclosure of defined benefit plans [line items]    
Surplus in plan (28,565,000) (26,752,000)
Annual contributions 7,197,000  
UNITED STATES    
Disclosure of defined benefit plans [line items]    
Deferred compensation plan assets $ 88,076,000 71,863,000
CMG U.K. Pension Scheme | U.K.    
Disclosure of defined benefit plans [line items]    
Equity investments, target allocation percentage of plan assets 65.00%  
Surplus in plan $ 34,707,000  
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 $ 85,000  
Current service cost $ 339,000  
Logica Defined Benefit Pension Plan | U.K.    
Disclosure of defined benefit plans [line items]    
Equity investments, target allocation percentage of plan assets 10.00%  
Bond investments, target allocation percentage of plan assets 90.00%  
Surplus in plan $ 17,819,000  
Alecta multi-employer plan    
Disclosure of defined benefit plans [line items]    
Annual contributions 14,867,000  
Pension cost for defined contribution plans $ 25,311,000 $ 28,868,000
Proportion of total contributions to the plan 0.57%  
Proportion of total number of active members in the plan 0.48%  
Collective funding solvency percentage 178.00% 189.00%
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%