XML 138 R100.htm IDEA: XBRL DOCUMENT v3.24.4
Employee benefits - Sensitivity analysis for actuarial assumptions (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Actuarial assumption of discount rates | U.K.    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ (18,334) $ (15,631)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 19,263 $ 16,416
Actuarial assumption of discount rates | France    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ (2,927) $ (2,370)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 3,056 $ 2,473
Actuarial assumption of discount rates | Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ (1,796) $ (1,596)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 1,874 $ 1,663
Actuarial assumption of expected rates of salary increases | U.K.    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 181 $ 137
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (179) $ (132)
Actuarial assumption of expected rates of salary increases | France    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 3,151 $ 2,572
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (3,029) $ (2,474)
Actuarial assumption of expected rates of salary increases | Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 23 $ 23
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (21) $ (21)
Actuarial assumption of expected rates of pension increases | U.K.    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 10,675 $ 8,713
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (9,287) $ (8,503)
Actuarial assumption of expected rates of pension increases | France    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 0 $ 0
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 0 $ 0
Actuarial assumption of expected rates of pension increases | Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 948 $ 834
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (913) $ (805)
Actuarial assumption of expected rates of inflation | U.K.    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 12,047 $ 12,348
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (11,798) $ (11,948)
Actuarial assumption of expected rates of inflation | France    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 3,151 $ 5,660
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (3,029) $ (5,110)
Actuarial assumption of expected rates of inflation | Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.25% 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25% 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 948 $ 834
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (913) $ (805)
Actuarial assumption of life expectancy after retirement | U.K.    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Period of reasonably possible increase in actuarial assumption 1 year 1 year
Period of reasonably possible decrease in actuarial assumption 1 year 1 year
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 15,309 $ 12,614
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (15,478) $ (12,801)
Actuarial assumption of life expectancy after retirement | France    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Period of reasonably possible increase in actuarial assumption 1 year 1 year
Period of reasonably possible decrease in actuarial assumption 1 year 1 year
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 664 $ 943
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (710) $ (1,258)
Actuarial assumption of life expectancy after retirement | Germany    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Period of reasonably possible increase in actuarial assumption 1 year 1 year
Period of reasonably possible decrease in actuarial assumption 1 year 1 year
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 2,025 $ 1,702
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (1,809) $ (1,530)