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Commitments and Contingencies - Additional Information (Detail) - INR (₨) ₨ in Millions | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Nov. 30, 2017 | Mar. 31, 2016 | Mar. 31, 2012 | Mar. 31, 2011
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Rental payments under lease agreement | ₨ 6,490 | ₨ 6,236 |  |  |  |  |  |  |  |  |
Capital commitments | 12,443 |  | ₨ 14,011 |  |  |  |  |  |  |  |
Financial guarantee amount | 18,456 |  | 18,655 |  |  |  |  |  |  |  |
Dispute resolution panel [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Contingent tax liability |  |  |  |  |  |  |  |  |  | ₨ 227 |
Tax contingent liability [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Contingent tax liability | 66,441 |  | 77,873 |  |  |  |  | ₨ 3,286 |  |  | ₨ 47,583
Interest on contingent tax liability |  |  |  |  |  |  |  | ₨ 1,166 |  | ₨ 102 | ₨ 13,832
Tax contingent liability [member] | Dispute resolution panel [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Contingent tax liability |  |  | 704 |  | ₨ 1,347 |  | ₨ 1,030 |  |  |  |
Interest on contingent tax liability |  |  |  | ₨ 0 | ₨ 0 | ₨ 0 |  |  |  |  |
Excise duty, Custom duty, sales tax and other matters [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Contingent tax liability | ₨ 8,477 |  | ₨ 8,033 |  |  |  |  |  |  |  |

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- Definition The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of expense recognised on rental activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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