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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, 2018 ₨ / shares shares | Mar. 31, 2018 ₨ / shares $ / shares shares | Mar. 31, 2017 ₨ / shares shares | Mar. 31, 2016 ₨ / shares shares | Mar. 31, 2015 ₨ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Number Of Shares Arising Out Of Options | shares | 75,443,800 | 75,443,800 | 92,156,300 | 128,654,300 | 109,033,000
Weighted Average Exercise Price | ₨ 1,050.22 | ₨ 1,050.22 | ₨ 904.97 | ₨ 840.19 | ₨ 683.16
Plan ''C'' |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 680.0 | ₨ 10.44 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 835.50 | ₨ 12.83 |  |  |
Number Of Shares Arising Out Of Options | shares | 3,261,500 | 3,261,500 |  |  |
Weighted Average Remaining Life | 1 year 3 months 25 days | 1 year 3 months 25 days |  |  |
Weighted Average Exercise Price | ₨ 685.72 | ₨ 685.72 |  |  |
Plan ''D'' |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price | (per share) | ₨ 680 | ₨ 10.44 |  |  |
Number Of Shares Arising Out Of Options | shares | 1,635,700 | 1,635,700 |  |  |
Weighted Average Remaining Life | 1 year 5 months 4 days | 1 year 5 months 4 days |  |  |
Weighted Average Exercise Price | ₨ 680.00 | ₨ 680.00 |  |  |
Plan "E" |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price | $ / shares |  | ₨ 10.44 |  |  |
Range of exercise price, Lower Range | ₨ 680.0 |  |  |  |
Number Of Shares Arising Out Of Options | shares | 6,224,900 | 6,224,900 |  |  |
Weighted Average Remaining Life | 1 year 6 months 3 days | 1 year 6 months 3 days |  |  |
Weighted Average Exercise Price | ₨ 680.00 | ₨ 680.00 |  |  |
Plan "F" |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 835.5 | ₨ 12.83 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 1,462.15 | ₨ 22.46 |  |  |
Number Of Shares Arising Out Of Options | shares | 64,321,700 | 64,321,700 |  |  |
Weighted Average Remaining Life | 3 years 7 months 2 days | 3 years 7 months 2 days |  |  |
Weighted Average Exercise Price | ₨ 1,113.95 | ₨ 1,113.95 |  |  |

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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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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