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Significant accounting policies - Summary of difference between the lease obligation disclosed under IAS 17 To IFRS 16 (Detail) - INR (₨) ₨ in Millions | Mar. 31, 2020 | Apr. 01, 2019 | Mar. 31, 2019
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Disclosure Of Difference Between The Lease Obligation Disclosed Under IAS Seventeen To IFRS Sixteen [Line Items] |  |  |
Lease liability recognized as at April 1, 2019 | ₨ 19,198 | ₨ 15,379 |
IFRS 16 [Member] |  |  |
Disclosure Of Difference Between The Lease Obligation Disclosed Under IAS Seventeen To IFRS Sixteen [Line Items] |  |  |
Operating lease commitments disclosed as at March 31, 2019 |  |  | ₨ 19,741
(Less): Impact of Discounting on Opening Lease liability |  |  | (1,954)
(Less): Short-term leases not recognized as a liability |  |  | (1,675)
(Less): Low-value leases not recognized as a liability |  |  | (64)
(Less): Leases commencing after 1st April, but entered into on or before 31st March |  |  | ₨ (669)
Lease liability recognized as at April 1, 2019 |  | ₨ 15,379 |

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Disclosure Of Difference Between The Lease Obligation Disclosed Under IAS Seventeen To IFRS Sixteen + References No definition available. + Details
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- Definition Impact Of discounting on opening lease liability. + References No definition available. + Details
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- Definition Lease commencings before commitments. + References No definition available. + Details
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- Definition Low value leases not recognized as a liability. + References No definition available. + Details
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- Definition Operating Lease Commitments. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Short term leases not recognized as a liability. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |