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EMPLOYEE BENEFITS OBLIGATIONS - Future Mortality Rate (Details)
Mar. 31, 2020
Employee_Age
Mar. 31, 2019
Employee_Age
Male | Life Expectancy, at Age 45 | Canada | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.5 23.4
Male | Life Expectancy, at Age 45 | Netherlands | AG2018    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.9 23.8
Male | Life Expectancy, at Age 45 | Germany | Heubeck RT2018G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.0 22.8
Male | Life Expectancy, at Age 45 | United Kingdom | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.1 23.5
Male | Life Expectancy, at Age 45 | United States | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.7 23.4
Male | Life Expectancy, at Age 65 | Canada | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 22.0 21.9
Male | Life Expectancy, at Age 65 | Netherlands | AG2018    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 21.8 21.7
Male | Life Expectancy, at Age 65 | Germany | Heubeck RT2018G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 20.2 20.0
Male | Life Expectancy, at Age 65 | United Kingdom | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 22.0 22.4
Male | Life Expectancy, at Age 65 | United States | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.3 21.9
Female | Life Expectancy, at Age 45 | Canada | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.6 25.5
Female | Life Expectancy, at Age 45 | Netherlands | AG2018    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.9 25.8
Female | Life Expectancy, at Age 45 | Germany | Heubeck RT2018G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.9 25.8
Female | Life Expectancy, at Age 45 | United Kingdom | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.1 25.5
Female | Life Expectancy, at Age 45 | United States | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 26.2 25.8
Female | Life Expectancy, at Age 65 | Canada | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.3 24.2
Female | Life Expectancy, at Age 65 | Netherlands | AG2018    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.7 23.6
Female | Life Expectancy, at Age 65 | Germany | Heubeck RT2018G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.7 23.6
Female | Life Expectancy, at Age 65 | United Kingdom | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 22.0 24.2
Female | Life Expectancy, at Age 65 | United States | CPM private tables    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.9 24.4