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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, 2020 INR (₨) | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
Disclosure Of Expense [line items] |  |  |  |
Impairment on certain software platform and intangible assets recognized on acquisitions | ₨ 0 | ₨ 2,318 |  | ₨ 643
Miscellaneous expenses | ₨ 5,344 | 11,736 |  | 4,705
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 2019-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_126_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_129_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount recognised for new other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84_b&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_102&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 + Details
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