XML 132 R93.htm IDEA: XBRL DOCUMENT v3.25.3
Employee benefits - Narrative (Details)
 12 Months Ended
Sep. 30, 2025
CAD ($)
plan
Sep. 30, 2024
CAD ($)
Disclosure of defined benefit plans [line items]    
Surplus in plan $ (143,559,000) $ (167,920,000)
Current service cost 16,290,000 14,165,000
Annual contributions 9,525,000  
Pension cost for defined contribution plans 324,486,000 296,470,000
Deferred compensation plan liabilities 139,317,000 124,447,000
Deferred compensation plan assets $ 125,388,000 112,270,000
U.K.    
Disclosure of defined benefit plans [line items]    
Number of defined benefit pension plans | plan 3  
Surplus in plan $ 55,084,000 22,230,000
Annual contributions 433,000  
Other    
Disclosure of defined benefit plans [line items]    
Surplus in plan (35,596,000) (32,668,000)
Annual contributions 9,092,000  
UNITED STATES    
Disclosure of defined benefit plans [line items]    
Deferred compensation plan assets $ 125,388,000 112,270,000
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 $ 38,071,000  
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 $ 94,000  
Current service cost $ 367,000  
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 $ 19,547,000  
Alecta multi-employer plan    
Disclosure of defined benefit plans [line items]    
Pension cost for defined contribution plans $ 26,589,000 $ 23,422,000
Proportion of total contributions to the plan 0.63%  
Proportion of total number of active members in the plan 0.46%  
Collective funding solvency percentage 167.00% 163.00%
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 170.00%