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Finance Expense - Summary of Finance 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 (₨)
Disclosure of finance expense [abstract] |  |  |  |
Interest expense | ₨ 3,451 |  | ₨ 2,675 | ₨ 1,206
Exchange fluctuation on foreign currency borrowings, net | 2,379 |  | 3,267 | 4,172
Total | ₨ 5,830 | $ 90 | ₨ 5,942 | ₨ 5,378

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- Definition The amount of expense arising from interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_23_d&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_28_e&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_f&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition Net foreign exchange differences qualified as borrowing costs. + References No definition available. + Details
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