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Employee benefits - Sensitivity analysis for actuarial assumptions (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
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 | $ (15,631) | $ (19,249)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 16,416 | $ 20,234
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 | $ (2,370) | $ (2,294)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 2,473 | $ 2,500
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 | $ (1,596) | $ (1,512)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 1,663 | $ 1,578
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 | $ 137 | $ 193
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (132) | $ (188)
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 | $ 2,572 | $ 2,584
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (2,474) | $ (2,388)
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 | $ 20
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (21) | $ (19)
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 | $ 8,713 | $ 13,324
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (8,503) | $ (12,614)
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 | $ 834 | $ 774
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (805) | $ (747)
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 | $ 12,348 | $ 21,301
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (11,948) | $ (16,005)
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 | $ 5,660 | $ 2,584
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (5,110) | $ (2,388)
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 | $ 834 | $ 774
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (805) | $ (747)
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 | $ 12,614 | $ 12,957
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (12,801) | $ (13,093)
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 | $ 943 | $ 281
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (1,258) | $ (320)
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 | $ 1,702 | $ 1,511
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (1,530) | $ (1,360)

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