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Income Taxes - Summary of Components of Income Tax Expense (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨)
Current taxes |  |  |  |
Domestic | ₨ 18,500 |  | ₨ 21,089 | ₨ 20,221
Foreign | 7,834 |  | 5,412 | 5,536
Current taxes | 26,334 |  | 26,501 | 25,757
Deferred taxes |  |  |  |
Domestic | 3 |  | (63) | (506)
Foreign | (3,947) |  | (1,225) | 115
Deferred taxes | (3,944) |  | (1,288) | (391)
Income tax expense | ₨ 22,390 | $ 344 | ₨ 25,213 | ₨ 25,366

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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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