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v3.25.2

Stock - Stock Options Outstanding, Employees Stock Option Schemes (Detail) - Employee Stock Option | 12 Months Ended |  |  |
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Mar. 31, 2025 ₨ / shares shares | Mar. 31, 2025 $ / shares ₨ / shares shares | Mar. 31, 2024 ₨ / shares shares | Mar. 31, 2023 ₨ / shares shares | Mar. 31, 2022 ₨ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Number Of Shares Arising Out Of Options | shares | 141,374,510 | 141,374,510 | 175,659,424 | 151,682,461 | 158,106,016
Weighted Average Exercise Price | ₨ / shares | ₨ 1,413.25 | ₨ 1,413.25 | ₨ 1,307.93 | ₨ 1,264.86 | ₨ 1,175.65
Plan "E" |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price | (per share) | ₨ 1,636.9 | ₨ 19.16 |  |  |
Number Of Shares Arising Out Of Options | shares | 4,793,680 | 4,793,680 |  |  |
Weighted Average Remaining Life | 4 years 11 months 15 days | 4 years 11 months 15 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 1,636.9 | ₨ 1,636.9 |  |  |
Plan "F" |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price | (per share) | ₨ 1,636.9 | ₨ 19.16 |  |  |
Number Of Shares Arising Out Of Options | shares | 11,490,680 | 11,490,680 |  |  |
Weighted Average Remaining Life | 4 years 11 months 8 days | 4 years 11 months 8 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 1,636.9 | ₨ 1,636.9 |  |  |
Plan "G" |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 882.85 | ₨ 10.33 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 1,673.1 | ₨ 19.58 |  |  |
Number Of Shares Arising Out Of Options | shares | 74,981,293 | 74,981,293 |  |  |
Weighted Average Remaining Life | 2 years 5 months 23 days | 2 years 5 months 23 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 1,360.69 | ₨ 1,360.69 |  |  |
Plan "H" |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 1,677.3 | ₨ 19.63 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 1,734.2 | ₨ 20.3 |  |  |
Number Of Shares Arising Out Of Options | shares | 22,572,860 | 22,572,860 |  |  |
Weighted Average Remaining Life | 6 years 21 days | 6 years 21 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 1,733.15 | ₨ 1,733.15 |  |  |
eHDFC [Member] |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |
Range of exercise price, Lower Range | (per share) | 160.79 | ₨ 1.88 |  |  |
Range of exercise price, Upper Range | (per share) | ₨ 1,535.27 | ₨ 17.97 |  |  |
Number Of Shares Arising Out Of Options | shares | 27,535,997 | 27,535,997 |  |  |
Weighted Average Remaining Life | 2 years 6 months 29 days | 2 years 6 months 29 days |  |  |
Weighted Average Exercise Price | ₨ / shares | ₨ 1,139.68 | ₨ 1,139.68 |  |  |

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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