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EMPLOYEE BENEFITS OBLIGATIONS - Future Mortality Rate (Details)
Mar. 31, 2018
Employee_Age
Mar. 31, 2017
Employee_Age
Male | Life Expectancy, at Age 45 | CANADA | CPM private tables (employees)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.0 22.4
Male | Life Expectancy, at Age 45 | CANADA | CPM private tables (designated executives)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.6 23.9
Male | Life Expectancy, at Age 45 | CANADA | CPM private tables (CMAT)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.3 22.7
Male | Life Expectancy, at Age 45 | NETHERLANDS | AG2016    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.9 23.8
Male | Life Expectancy, at Age 45 | GERMANY | Heubeck RT2005G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 21.9 21.8
Male | Life Expectancy, at Age 45 | NORWAY | K2013    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.1 22.8
Male | Life Expectancy, at Age 45 | UNITED KINGDOM | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.4 24.3
Male | Life Expectancy, at Age 65 | CANADA | CPM private tables (employees)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 21.5 21.3
Male | Life Expectancy, at Age 65 | CANADA | CPM private tables (designated executives)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.1 22.9
Male | Life Expectancy, at Age 65 | CANADA | CPM private tables (CMAT)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 21.9 21.6
Male | Life Expectancy, at Age 65 | NETHERLANDS | AG2016    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 21.7 21.5
Male | Life Expectancy, at Age 65 | GERMANY | Heubeck RT2005G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 19.3 19.3
Male | Life Expectancy, at Age 65 | NORWAY | K2013    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 22.2 22.1
Male | Life Expectancy, at Age 65 | UNITED KINGDOM | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 22.6 22.6
Female | Life Expectancy, at Age 45 | CANADA | CPM private tables (employees)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.4 24.7
Female | Life Expectancy, at Age 45 | CANADA | CPM private tables (designated executives)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 26.1 25.4
Female | Life Expectancy, at Age 45 | CANADA | CPM private tables (CMAT)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.7 25.0
Female | Life Expectancy, at Age 45 | NETHERLANDS | AG2016    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 26.3 26.2
Female | Life Expectancy, at Age 45 | GERMANY | Heubeck RT2005G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.8 25.7
Female | Life Expectancy, at Age 45 | NORWAY | K2013    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 26.8 26.5
Female | Life Expectancy, at Age 45 | UNITED KINGDOM | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 26.9 26.8
Female | Life Expectancy, at Age 65 | CANADA | CPM private tables (employees)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.0 23.7
Female | Life Expectancy, at Age 65 | CANADA | CPM private tables (designated executives)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.8 24.4
Female | Life Expectancy, at Age 65 | CANADA | CPM private tables (CMAT)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 24.4 24.0
Female | Life Expectancy, at Age 65 | NETHERLANDS | AG2016    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.9 23.8
Female | Life Expectancy, at Age 65 | GERMANY | Heubeck RT2005G    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 23.3 23.2
Female | Life Expectancy, at Age 65 | NORWAY | K2013    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.5 25.4
Female | Life Expectancy, at Age 65 | UNITED KINGDOM | S1PA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Employee life expectancy 25.0 24.9