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Stock Options Outstanding, Employees Stock Option Schemes (Detail) - Employees Stock Option Scheme | 12 Months Ended |  |  |
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Mar. 31, 2020 ₨ / shares shares | Mar. 31, 2020 $ / shares ₨ / shares shares | Mar. 31, 2019 ₨ / shares shares | Mar. 31, 2018 ₨ / shares shares | Mar. 31, 2017 ₨ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Number Of Shares Arising Out Of Options | shares | 142,865,602 | 142,865,602 | 136,612,822 | 150,887,600 | 184,312,600
Weighted Average Exercise Price | ₨ / shares | ₨ 899.03 | ₨ 899.03 | ₨ 682.99 | ₨ 525.11 | ₨ 452.48
Plan ''C'' |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 340.00 | ₨ 4.51 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 417.75 | ₨ 5.54 |  |  |
Number Of Shares Arising Out Of Options | shares | 485,100 | 485,100 |  |  |
Weighted Average Remaining Life | 4 months 2 days | 4 months 2 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 344.05 | ₨ 344.05 |  |  |
Plan ''D'' |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price | (per share) | ₨ 340.00 | ₨ 5.51 |  |  |
Number Of Shares Arising Out Of Options | shares | 345,900 | 345,900 |  |  |
Weighted Average Remaining Life | 3 months 18 days | 3 months 18 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 340.00 | ₨ 340.00 |  |  |
Plan "E" |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price | (per share) | ₨ 340.00 | ₨ 5.51 |  |  |
Number Of Shares Arising Out Of Options | shares | 1,705,500 | 1,705,500 |  |  |
Weighted Average Remaining Life | 3 months 18 days | 3 months 18 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 340.00 | ₨ 340.00 |  |  |
Plan "F" |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 417.75 | ₨ 5.54 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 731.08 | ₨ 9.70 |  |  |
Number Of Shares Arising Out Of Options | shares | 58,568,822 | 58,568,822 |  |  |
Weighted Average Remaining Life | 2 years 7 days | 2 years 7 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 587.08 | ₨ 587.08 |  |  |
Plan "G" |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 882.85 | ₨ 11.71 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 1,229.00 | ₨ 16.30 |  |  |
Number Of Shares Arising Out Of Options | shares | 81,760,280 | 81,760,280 |  |  |
Weighted Average Remaining Life | 3 years 5 months 12 days | 3 years 5 months 12 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 1,139.82 | ₨ 1,139.82 |  |  |

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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