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Earnings per equity share (Tables) | 12 Months Ended
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Mar. 31, 2018
Weighted-average number of shares |
|  | As of March 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |
Weighted average number of equity shares used in computing basic earnings per equity share |  |  | 2,517,429,120 |  |  |  | 2,544,333,609 |  |  |  | 2,580,538,505 |
Effect of potential equity shares for stock options outstanding |  |  | 27,938,561 |  |  |  | 31,017,917 |  |  |  | 33,400,121 |
Weighted average number of equity shares used in computing diluted earnings per equity share |  |  | 2,545,367,681 |  |  |  | 2,575,351,526 |  |  |  | 2,613,938,626 |
Reconciliation of Earnings Per Share | The following are reconciliations of basic and diluted earnings per equity share and earnings per ADS.
|  | Fiscal years ended March 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |  |  | 2018 |
Basic earnings per share |  | Rs. | 46.84 |  |  | Rs. | 55.23 |  |  | Rs. | 69.18 |  |  | US$ | 1.06 |
Effect of potential equity shares for stock options outstanding |  |  | 0.51 |  |  |  | 0.66 |  |  |  | 0.89 |  |  |  | 0.01 |
Diluted earnings per share |  | Rs. | 46.33 |  |  | Rs. | 54.57 |  |  | Rs. | 68.29 |  |  | US$ | 1.05 |
Basic earnings per ADS |  | Rs. | 140.52 |  |  | Rs. | 165.69 |  |  | Rs. | 207.54 |  |  | US$ | 3.18 |
Effect of potential equity shares for stock options outstanding |  |  | 1.53 |  |  |  | 1.98 |  |  |  | 2.67 |  |  |  | 0.03 |
Diluted earnings per ADS |  | Rs. | 138.99 |  |  | Rs. | 163.71 |  |  | Rs. | 204.87 |  |  | US$ | 3.15 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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