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Earnings Per Equity Share - Summary of Diluted Earnings Per Share (Detail) ₨ / shares in Units, $ / shares in Units, ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2018 INR (₨) ₨ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2017 INR (₨) ₨ / shares shares | Mar. 31, 2016 INR (₨) ₨ / shares shares
Earnings per share [abstract] |  |  |  |
Profit attributable to equity holders of the Company | ₨ 80,081 | $ 1,230 | ₨ 84,895 | ₨ 89,075
Weighted average number of equity shares outstanding | 4,750,043,400 | 4,750,043,400 | 4,857,081,010 | 4,913,118,800
Effect of dilutive equivalent share options | 8,318,575 | 8,318,575 | 14,266,128 | 10,261,016
Weighted average number of equity shares for diluted earnings per share | 4,758,361,975 | 4,758,361,975 | 4,871,347,138 | 4,923,379,816
Diluted earnings per share | (per share) | ₨ 16.83 | $ 0.26 | ₨ 17.43 | ₨ 18.09

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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_81B_a_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
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