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Employee Benefits - Summary of Principal Assumptions Used for Purpose of Actuarial Valuation of Defined Benefit Plans (Detail)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disclosure of actuarial assumptions [line items]
Discount rate	5.05%	6.05%
Expected return on plan assets	5.05%	6.05%
Expected rate of salary increase	6.60%	6.80%
Duration of defined benefit obligations	9 years	8 years
Provident fund [member]
Disclosure of actuarial assumptions [line items]
Discount rate	6.05%	7.00%
Average remaining tenure of investment portfolio	7 years	8 years
Guaranteed rate of return	8.50%	8.65%

X

- 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
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 144
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-URIDate 2019-03-27

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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 2019-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard
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X

- Definition

The life expectancy after retirement used as a 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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-Number 19
-IssueDate 2019-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard
-URIDate 2019-03-27

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- Definition

Actuarial assumption of expected return on plan assets.

+ References

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- Definition

Actuarial assumption of guaranteed rate of return.

+ References

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- Definition

Average remaining tenure of investment portfolio.

+ References

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- Definition

Disclosure of actuarial assumptions [line items]

+ References

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