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Expenses by Nature - Summary of Expenses by Nature (Parenthetical) (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨)
Disclosure Of Expense [line items] |  |  |  |
Impairment on certain software platform and intangible assets recognized on acquisitions | ₨ 2,318 |  | ₨ 643 | ₨ 3,056
Miscellaneous expenses | 11,736 |  | 4,705 | ₨ 5,836
National Grid on settlement of legal claim [member] |  |  |  |
Disclosure Of Expense [line items] |  |  |  |
Miscellaneous expenses | ₨ 5,141 | $ 75 |  |
Provision for impairment of receivables and deferred contract cost [member] |  |  |  |
Disclosure Of Expense [line items] |  |  |  |
Provision for impairment of receivables and deferred contract cost |  |  | 4,612 |
Provision for impairment of receivables and deferred contract cost [member] | Cost Of Revenue [member] |  |  |  |
Disclosure Of Expense [line items] |  |  |  |
Provision for impairment of receivables and deferred contract cost |  |  | 416 |
Provision for impairment of receivables and deferred contract cost [member] | General and administrative expenses [member] |  |  |  |
Disclosure Of Expense [line items] |  |  |  |
Provision for impairment of receivables and deferred contract cost |  |  | ₨ 4,196 |

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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_126_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_129_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 + Details
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