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Employee Benefits - Summary of Defined Benefit Plans (Detail) - INR (₨) ₨ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |
Defined benefit obligation at the beginning of the year | ₨ (147) |  |  |  |
Present value of unfunded obligation |  |  |  | ₨ (1,042) | ₨ (147)
Recognized asset/(liability) | (147) | ₨ (147) |  | (1,042) | (147)
Re-measurement of net defined benefit liability/(asset) |  |  |  |  |
Return on plan assets excluding interest income | (607) | (501) | ₨ (692) |  |
Defined benefit obligation at the end of the year | (1,042) | (147) |  |  |
Plan assets [member] |  |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |  |
Defined benefit obligation at the beginning of the year | 8,507 | 7,919 |  |  |
Acquisitions (Note 32) | 109 | 28 |  |  |
Recognized asset/(liability) | 8,507 | 7,919 | 7,919 | ₨ 9,443 | ₨ 8,507
Expected return on plan assets | 558 | 483 |  |  |
Employer contributions | 254 | 59 |  |  |
Benefits paid | (34) |  |  |  |
Re-measurement of net defined benefit liability/(asset) |  |  |  |  |
Return on plan assets excluding interest income | 49 | 18 |  |  |
Defined benefit obligation at the end of the year | ₨ 9,443 | ₨ 8,507 | ₨ 7,919 |  |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Defined benefit unfunded obligation at present value. + References No definition available. + Details
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- Definition Expected return on plan assets net defined benefit liability asset. + References No definition available. + Details
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