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Earnings Per Equity Share - Additional Information (Detail) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 18, 2021 ₨ / shares | Apr. 22, 2021 | Aug. 02, 2019 ₨ / shares | Mar. 31, 2022 ₨ / shares shares | Mar. 31, 2022 ₨ / shares $ / shares shares | Mar. 31, 2021 ₨ / shares shares | Mar. 31, 2020 ₨ / shares shares | Sep. 20, 2019 ₨ / shares shares | Sep. 19, 2019 ₨ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Equity shares, issued | shares |  |  |  | 5,545,540,976 | 5,545,540,976 | 5,512,776,482 |  | 5,470,763,894 |
Equity shares, par value |  |  |  | ₨ 1 | ₨ 1 | ₨ 1 |  | ₨ 1 | ₨ 2
Required transfer of after tax Indian GAAP profit to a non-distributable statutory reserve in order to pay dividends without prior RBI approval |  |  |  | 25.00% | 25.00% |  |  |  |
Dividends declared |  |  |  |  |  | 6.5 | ₨ 2.5 |  |
Dividends declared per equity share | (per share) | ₨ 6.5 |  |  | ₨ 15.5 | ₨ 0.2 | ₨ 6.5 | ₨ 2.5 |  |
Special Interim Dividend |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  | ₨ 2.5 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Equity shares, par value |  |  |  |  |  |  |  | ₨ 2 |
Employees Stock Option Scheme |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Potential equity shares excluded from the calculation of diluted earnings per share, average outstanding balance | shares |  |  |  | 19,064,987 | 19,064,987 | 73,917,840 | 24,224,032 |  |
Indian GAAP [Member] |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Dividend payout, description of restrictions |  |  |  | As per the RBI guidelines, the dividend payout (excluding dividend tax) cannot exceed 35% of net income as calculated under Indian GAAP. | As per the RBI guidelines, the dividend payout (excluding dividend tax) cannot exceed 35% of net income as calculated under Indian GAAP. |  |  |  |
Indian GAAP [Member] | Maximum |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Dividend payout, maximum pay out as a percentage of net income calculated under Indian GAAP |  | 50.00% |  | 35.00% | 35.00% |  |  |  |

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- Definition Percentage of after tax Indian GAAP profit required transfer to a non-distributable statutory reserve for payment of dividends without prior RBI approval. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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