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Employee Benefits - Summary of Principal Assumptions Used for Purpose of Actuarial Valuation of Defined Benefit Plans (Detail) - yr	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disclosure of actuarial assumptions [line items]
Discount rate	6.05%	6.30%
Expected return on plan assets	6.05%	6.30%
Expected rate of salary increase	6.80%	6.89%
Duration of defined benefit obligations	0	0
Provident fund [member]
Disclosure of actuarial assumptions [line items]
Discount rate	7.00%	7.35%
Average remaining tenure of investment portfolio	8 years	7 years
Guaranteed rate of return	8.65%	8.55%

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 2018-01-01
-Paragraph 144
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-URIDate 2018-03-16

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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 2018-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard
-URIDate 2018-03-16

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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
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard
-URIDate 2018-03-16

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- Definition

Actuarial assumption of expected return on plan assets.

+ References

No definition available.

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X

- Definition

Actuarial assumption of guaranteed rate of return.

+ References

No definition available.

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- Definition

Average remaining tenure of investment portfolio.

+ References

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- Definition

Disclosure of actuarial assumptions [line items]

+ References

No definition available.

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