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EMPLOYEE BENEFITS OBLIGATIONS - Future Mortality Rate (Details) | Mar. 31, 2018 Employee_Age | Mar. 31, 2017 Employee_Age
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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

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