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Earnings per equity share (Tables) | 12 Months Ended
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Mar. 31, 2020
Weighted-average number of shares |
|  | As of March 31, |
|  | 2018 |  |  | 2019 |  |  | 2020 |
Weighted average number of equity shares used in computing basic earnings per equity share |  |  | 5,161,077,010 |  |  |  | 5,360,068,058 |  |  |  | 5,468,802,148 |
Effect of potential equity shares for stock options outstanding |  |  | 66,800,242 |  |  |  | 53,585,896 |  |  |  | 36,990,405 |
Weighted average number of equity shares used in computing diluted earnings per equity share |  |  | 5,227,877,252 |  |  |  | 5,413,653,954 |  |  |  | 5,505,792,553 |
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, |
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2020 |
Basic earnings per share |  | Rs. | 34.59 |  |  | Rs. | 41.07 |  |  | Rs. | 47.59 |  |  | US$ | 0.63 |
Effect of potential equity shares for stock options outstanding |  |  | 0.44 |  |  |  | 0.41 |  |  |  | 0.32 |  |  |  | 0.01 |
Diluted earnings per share |  | Rs. | 34.15 |  |  | Rs. | 40.66 |  |  | Rs. | 47.27 |  |  | US$ | 0.62 |
Basic earnings per ADS |  | Rs. | 103.77 |  |  | Rs. | 123.21 |  |  | Rs. | 142.77 |  |  | US$ | 1.89 |
Effect of potential equity shares for stock options outstanding |  |  | 1.32 |  |  |  | 1.23 |  |  |  | 0.96 |  |  |  | 0.03 |
Diluted earnings per ADS |  | Rs. | 102.45 |  |  | Rs. | 121.98 |  |  | Rs. | 141.81 |  |  | US$ | 1.86 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -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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