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Financial Instruments - Summary of Significant Unobservable Inputs to Valuation (Detail) - Unquoted equity investments [member] - INR (₨) ₨ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Discounted cash flow model [member] | Long term growth rate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow model |
Significant unobservable input | Long term growth rate |
Movement by | 0.50% |
Increase | ₨ 201 |
Decrease | ₨ (187) |
Discounted cash flow model [member] | Discount rate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Significant unobservable input | Discount rate |
Movement by | 0.50% |
Increase | ₨ (243) |
Decrease | ₨ 256 |
Third party quote [member] | Revenue achievement [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique |  | Third party quote
Significant unobservable input |  | Revenue achievement
Movement by |  | 1.00%
Increase |  | ₨ 18
Decrease |  | ₨ (18)

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- Definition The amount of decrease in the fair value measurement of assets due to a change in one or more unobservable inputs to reflect reasonably possible alternative assumptions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_h_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The description of inputs used in the fair value measurement of assets. Inputs are the assumptions that market participants would use when pricing the asset, including assumptions about risk such as the risk inherent in a particular valuation technique used to measure fair value (such as a pricing model) and the risk inherent in the inputs to the valuation technique. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques [member]; Cost approach [member]; Income approach [member]; Market approach [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of increase in the fair value measurement of assets due to a change in one or more unobservable inputs to reflect reasonably possible alternative assumptions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_h_ii&doctype=Standard -URIDate 2018-03-16 + Details
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