XML 131 R93.htm IDEA: XBRL DOCUMENT v3.24.4
Employee benefits - Narrative (Details)
 12 Months Ended
Sep. 30, 2024
CAD ($)
plan
Sep. 30, 2023
CAD ($)
Disclosure of defined benefit plans [line items]    
Surplus in plan $ (167,920,000) $ (162,543,000)
Current service cost 14,165,000 13,734,000
Annual contributions 8,616,000  
Pension cost for defined contribution plans 296,470,000 282,284,000
Deferred compensation plan liabilities 124,447,000 97,745,000
Deferred compensation plan assets $ 112,270,000 88,076,000
U.K.    
Disclosure of defined benefit plans [line items]    
Number of defined benefit pension plans | plan 3  
Surplus in plan $ 22,230,000 593,000
Annual contributions 369,000  
Other    
Disclosure of defined benefit plans [line items]    
Surplus in plan (32,668,000) (28,565,000)
Annual contributions 8,246,000  
UNITED STATES    
Disclosure of defined benefit plans [line items]    
Deferred compensation plan assets $ 112,270,000 88,076,000
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 $ 36,812,000  
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 $ 91,000  
Current service cost $ 447,000  
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 $ 18,901,000  
Alecta multi-employer plan    
Disclosure of defined benefit plans [line items]    
Annual contributions 18,043,000  
Pension cost for defined contribution plans $ 23,422,000 $ 25,311,000
Proportion of total contributions to the plan 0.72%  
Proportion of total number of active members in the plan 0.48%  
Collective funding solvency percentage 163.00% 178.00%
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%