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EMPLOYEE BENEFITS OBLIGATIONS - Significant Assumptions Weighted (Details)
Mar. 31, 2021
Mar. 31, 2020
Canada    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Actuarial assumption of discount rates, pension obligation 3.32% 3.96%
Actuarial assumption of expected rates of salary increases, pension obligation 3.65% 3.66%
Actuarial assumption of discount rates, net pension cost 3.96% 3.33%
Actuarial assumption of expected rates of salary increases, net pension cost 3.66% 3.66%
Foreign    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Actuarial assumption of discount rates, pension obligation 1.06% 1.46%
Actuarial assumption of expected rates of salary increases, pension obligation 3.01% 2.92%
Actuarial assumption of discount rates, net pension cost 1.46% 1.64%
Actuarial assumption of expected rates of salary increases, net pension cost 2.92% 2.92%