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EMPLOYEE BENEFITS OBLIGATIONS - Future Mortality Rate (Details) | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Male | at age 45 | Canada | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 23 years 9 months 18 days | 23 years 8 months 12 days
Male | at age 45 | Germany | Heubeck RT2018G |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 23 years 6 months | 23 years 4 months 24 days
Male | at age 45 | United Kingdom | S3PFA M CMI 2022 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 22 years 8 months 12 days |
Male | at age 45 | United Kingdom | S2PxA CMI 2020 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy |  | 22 years 7 months 6 days
Male | at age 45 | United States | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 25 years | 24 years 10 months 24 days
Male | at age 65 | Canada | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 22 years 4 months 24 days | 22 years 2 months 12 days
Male | at age 65 | Germany | Heubeck RT2018G |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 20 years 9 months 18 days | 20 years 7 months 6 days
Male | at age 65 | United Kingdom | S3PFA M CMI 2022 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 21 years 4 months 24 days |
Male | at age 65 | United Kingdom | S2PxA CMI 2020 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy |  | 21 years 7 months 6 days
Male | at age 65 | United States | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 23 years 7 months 6 days | 23 years 6 months
Female | at age 45 | Canada | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 26 years 3 months 18 days | 26 years 1 month 6 days
Female | at age 45 | Germany | Heubeck RT2018G |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 26 years 4 months 24 days | 26 years 3 months 18 days
Female | at age 45 | United Kingdom | S3PFA M CMI 2022 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 24 years 9 months 18 days |
Female | at age 45 | United Kingdom | S2PxA CMI 2020 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy |  | 24 years 7 months 6 days
Female | at age 45 | United States | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 26 years 6 months | 26 years 4 months 24 days
Female | at age 65 | Canada | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 25 years | 24 years 9 months 18 days
Female | at age 65 | Germany | Heubeck RT2018G |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 24 years 2 months 12 days | 24 years
Female | at age 65 | United Kingdom | S3PFA M CMI 2022 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 23 years 3 months 18 days |
Female | at age 65 | United Kingdom | S2PxA CMI 2020 |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy |  | 23 years 4 months 24 days
Female | at age 65 | United States | CPM private tables |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Employee life expectancy | 25 years 6 months | 25 years 1 month 6 days

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