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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, 2018 | Mar. 31, 2017
Disclosure of actuarial assumptions [line items] |  |
Discount rate | 6.30% | 5.91%
Expected return on plan assets | 6.30% | 5.91%
Expected rate of salary increase | 6.89% | 6.90%
Duration of defined benefit obligations | 8 | 8
Provident fund [member] |  |
Disclosure of actuarial assumptions [line items] |  |
Discount rate | 7.35% | 6.90%
Average remaining tenure of investment portfolio | 7 years | 6 years
Guaranteed rate of return | 8.55% | 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Actuarial assumption of expected return on plan assets. + References No definition available. + Details
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- Definition Actuarial assumption of guaranteed rate of return. + References No definition available. + Details
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- Definition Average remaining tenure of investment portfolio. + References No definition available. + Details
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- Definition Disclosure of actuarial assumptions [Line Items] + References No definition available. + Details
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- Details
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