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Financial Instruments - Summary of Activity in Cash Flow Hedging Reserve within Equity Related to all Derivative Instruments Classified as Cash Flow Hedges (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disclosure of detailed information about hedges [abstract] |  |  |
Balance as at the beginning of the year |  | ₨ 3,019 | ₨ (143)
Deferred cancellation gain/ (loss), net |  | (201) | 6
Changes in fair value of effective portion of derivatives |  | (2,312) | 1,069
Net gain/(loss) reclassified to consolidated statement of income on occurrence of hedged transactions | [1] | (3,382) | 2,087
Gain/(loss) on cash flow hedging derivatives, net |  | (5,895) | 3,162
Balance as at the end of the year |  | (2,876) | 3,019
Deferred tax thereon |  | 561 | (604)
Balance as at the end of the year, net of deferred tax |  | ₨ (2,315) | ₨ 2,415
[1] | Includes net gain/(loss) reclassified to revenue (March 31, 2019: ₹2,585, March 31, 2020: ₹(4,761)) and cost of revenues (March 31, 2019: ₹(498), March 31, 2020: ₹1,379).

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- References No definition available. + Details
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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24C_b_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_23_c&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2019-01-01 -Paragraph 6.5.11 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2019-en-r&anchor=para_6.5.11&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Changes in fair value of effective portion of derivatives. + References No definition available. + Details
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- Definition Deferred cancellation (loss) gain. + References No definition available. + Details
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- Definition Deferred tax on fair value movements on cash flow hedges. + References No definition available. + Details
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- Definition Net (gain)/loss reclassified to statement of income on occurrence of hedged transactions. + References No definition available. + Details
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- Definition Reserve Of Cash Flow Hedges After Deferred Tax + References No definition available. + Details
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