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Employee Benefits - Summary of Actuarial Assumptions (Detail) | 12 Months Ended
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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

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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 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 + Details
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