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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)

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