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Employee Benefits - Additional Information (Detail) - INR (₨) ₨ in Millions | Mar. 31, 2020 | Mar. 31, 2019
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Actuarial assumption of discount rates [member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible increase in actuarial assumption | ₨ (626) | ₨ (405)
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible decrease in actuarial assumption | ₨ 584 | 435
Actuarial assumption of expected rates of salary increases [member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible increase in actuarial assumption | ₨ 353 | 245
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible decrease in actuarial assumption | ₨ (329) | ₨ (229)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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