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Dividends, Bonus and Buy Back of equity shares - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2018 INR (₨) ₨ / shares shares | Mar. 31, 2018 USD ($) | Mar. 12, 2018 INR (₨) ₨ / shares shares | Mar. 31, 2017 INR (₨) ₨ / shares | Mar. 31, 2016 INR (₨) ₨ / shares
Disclosure of dividends [line items] |  |  |  |  |
Cash dividends paid per equity share | ₨ / shares | ₨ 1 |  |  | ₨ 3 | ₨ 12
Interim dividend | ₨ 1 |  |  | ₨ 2 | ₨ 5
Bonus issue ratio |  |  | 100.00% |  |
Par value per share | ₨ / shares |  |  | ₨ 2 |  |
Bonus issue of equity shares | shares |  |  | 2,433,074,327 |  |
Bonus issue of equity shares, shares |  |  | ₨ 4,866 |  |
Number of shares approved for buyback | shares | 343,750,000 |  |  |  |
Payments on buyback of shares | ₨ 110,000 |  |  |  |
Payments on buyback of shares | 110,312 | $ 1,694 |  | ₨ 25,000 |
Reduction in share capital related to buyback | 687 |  |  |  |
Share premium [member] |  |  |  |  |
Disclosure of dividends [line items] |  |  |  |  |
Payments on buyback of shares | 1,656 |  |  |  |
Retained earnings [member] |  |  |  |  |
Disclosure of dividends [line items] |  |  |  |  |
Bonus issue of equity shares, shares | (4,866) |  |  |  |
Payments on buyback of shares | 108,344 |  |  |  |
Capital Redemption Reserve [member] |  |  |  |  |
Disclosure of dividends [line items] |  |  |  |  |
Payments on buyback of shares | ₨ 687 |  |  |  |

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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2017-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2017-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2017-03-09 + Details
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