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EMPLOYEE BENEFITS OBLIGATIONS - Significant Assumptions Weighted (Details)
Mar. 31, 2018
Mar. 31, 2017
Canadian    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Actuarial assumption of discount rates, pension obligation 3.48% 3.78%
Actuarial assumption of expected rates of salary increases, pension obligation 3.66% 3.50%
Actuarial assumption of discount rates, net pension cost 3.78% 3.96%
Actuarial assumption of expected rates of salary increases, net pension cost 3.50% 3.50%
Foreign    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Actuarial assumption of discount rates, pension obligation 1.88% 2.05%
Actuarial assumption of expected rates of salary increases, pension obligation 2.86% 2.82%
Actuarial assumption of discount rates, net pension cost 2.05% 2.26%
Actuarial assumption of expected rates of salary increases, net pension cost 2.82% 2.86%