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EMPLOYEE BENEFITS OBLIGATIONS - Future Mortality Rate (Details)
 12 Months Ended
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