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Employee Benefits - Summary of Actuarial Assumptions (Detail)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disclosure Of Defined Benefit Plans [Line Items]
Withdrawal rate		25.00%
Bottom of Range [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Discount rate (per annum)	5.40%	5.70%
Future salary growth (per annum)	5.00%	5.00%
Withdrawal rate	10.00%
Retirement age (years)	58 years	58 years
Top of Range [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Discount rate (per annum)	6.20%	6.40%
Future salary growth (per annum)	11.00%	11.00%
Withdrawal rate	25.00%
Retirement age (years)	65 years	65 years

X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard
-URIDate 2020-01-01

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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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Actuarial assumption of discount rates determine benefit obligations

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- Definition

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- Definition

Actuarial assumption of Withdrawal rates determine benefit obligations

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