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EMPLOYEE BENEFITS OBLIGATIONS - Significant Assumptions Weighted (Details)	Mar. 31, 2020	Mar. 31, 2019
Foreign
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Actuarial assumption of discount rates, pension obligation	1.46%	1.64%
Actuarial assumption of expected rates of salary increases, pension obligation	2.92%	2.92%
Actuarial assumption of discount rates, net pension cost	1.64%	1.88%
Actuarial assumption of expected rates of salary increases, net pension cost	2.92%	2.86%
Canada
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Actuarial assumption of discount rates, pension obligation	3.96%	3.33%
Actuarial assumption of expected rates of salary increases, pension obligation	3.66%	3.65%
Actuarial assumption of discount rates, net pension cost	3.33%	3.48%
Actuarial assumption of expected rates of salary increases, net pension cost	3.66%	3.65%

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- Definition

Actuarial Assumption Of Discount Rates, Net Pension Cost

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- Definition

Actuarial Assumption Of Expected Rates Of Salary Increases, Net Pension Cost

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- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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