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Employee Benefits - Summary of Principal Assumptions Used for Purpose of Actuarial Valuation of Defined Benefit Plans (Detail) | 12 Months Ended
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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%

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- 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 -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 + 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 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 + 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 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 + 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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