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Earnings Per Equity Share - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions |  |  |  | 12 Months Ended |  |  |
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Jun. 18, 2021 ₨ / shares | Apr. 22, 2021 | Aug. 02, 2019 ₨ / shares | Mar. 31, 2021 $ / shares ₨ / shares shares | Mar. 31, 2021 INR (₨) ₨ / shares shares | Mar. 31, 2020 ₨ / shares shares | Mar. 31, 2019 ₨ / shares | Mar. 31, 2021 $ / 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 |  |  |  | 5,512,776,482 | 5,512,776,482 | 5,483,286,460 |  | 5,512,776,482 | 5,470,763,894 |
Equity shares, par value |  |  |  | ₨ 1.0 | ₨ 1.0 | ₨ 1.0 |  |  | ₨ 1.0 | ₨ 2.0
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% |  |  |  |  |
Net income calculated under Indian GAAP | ₨ |  |  |  |  | ₨ 311,165.3 |  |  |  |  |
Dividends declared | (per share) |  |  |  |  |  | 2.5 | ₨ 7.5 | $ 0 |  |
Dividends declared per equity share | (per share) |  |  |  | ₨ 0.09 | ₨ 6.5 | ₨ 2.5 | ₨ 7.5 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per equity share | ₨ 6.5 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | ₨ 2.0 |
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 |  |  |  |  | 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) for March 31, 2021 cannot exceed 35% of net income of Rs. 311,165.3 million 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 |  |  |  |  | 35.00% |  |  |  |  |
Indian GAAP [Member] | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |

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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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