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Employee benefits - Sensitivity analysis for actuarial assumptions (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
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 | $ (19,249) | $ (36,571)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 20,234 | $ 38,221
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 | $ (2,294) | $ (2,716)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 2,500 | $ 2,851
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 | $ (1,512) | $ (2,986)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 1,578 | $ 3,144
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 | $ 193 | $ 480
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (188) | $ (471)
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 | $ 2,584 | $ 2,870
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (2,388) | $ (2,746)
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 | $ 20 | $ 35
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (19) | $ (34)
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 | $ 13,324 | $ 25,254
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (12,614) | $ (24,480)
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 | $ 774 | $ 1,440
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (747) | $ (1,381)
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 | $ 21,301 | $ 36,172
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (16,005) | $ (34,478)
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 | $ 2,584 | $ 2,870
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (2,388) | $ (2,746)
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 | $ 774 | $ 1,440
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (747) | $ (1,381)
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 | $ 12,957 | $ 27,907
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (13,093) | $ (27,556)
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 | $ 281 | $ 555
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (320) | $ (585)
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 | $ 1,511 | $ 3,131
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (1,360) | $ (2,761)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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