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Business Combination - Additional Information (Detail) ₨ / shares in Units, $ / shares in Units, ₨ in Thousands, $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |  |
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Mar. 19, 2024 INR (₨) | Jul. 01, 2023 INR (₨) shares | Jul. 01, 2023 USD ($) | Jun. 30, 2023 INR (₨) ₨ / shares shares | Jun. 30, 2023 USD ($) shares | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Jul. 01, 2023 USD ($) shares | Jun. 30, 2023 $ / shares | Mar. 31, 2023 INR (₨) | Mar. 31, 2023 USD ($) | Apr. 04, 2022 ₨ / shares shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | ₨ 1,629,510,300 |  | ₨ 1,629,510,300 | $ 19,074.2 | $ 19,074.2 |  |  | ₨ 74,937,900 |  |
Goodwill written off related to sale of business unit |  |  |  |  |  | ₨ 0 | $ 0.0 | 73,576,100 |  |  |  |  |  |  |
eHDFC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  | 100.00% |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Number of shares received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42
Number of shares held for each set of shares received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25
Business acquisition, effective date of acquisition |  | Jul. 01, 2023 | Jul. 01, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  |  | ₨ 5,337,741,500 | $ 62,480.9 |  |  |  |  |  |  |  |  |  |
Business acquisition, share price | (per share) |  |  |  | ₨ 1,701.4 |  |  |  |  |  |  |  | $ 19.9 |  |  |
Business acquisition, equity interest issued or issuable, number of shares |  |  |  | 3,110,396,492 | 3,110,396,492 |  |  |  |  |  |  |  |  |  |
Share based compensation by share based award number of shares underlying such awards post business combination |  | 48,461,845 |  |  |  |  |  |  |  |  | 48,461,845 |  |  |  |
Class of warrants or rights outstanding |  | 24,792,768 |  |  |  |  |  |  |  |  | 24,792,768 |  |  |  |
Goodwill |  | ₨ 1,628,148,500 |  |  |  |  |  | 1,628,148,500 |  |  | $ 19,058.3 |  |  |  |
Indefinite-lived intangible assets, purchase accounting adjustments |  | 1,434,818,100 | $ 16,795.2 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  | ₨ 1,900,000 |  |  |  |  |  |  |  |  | 22.2 |  |  |  |
Per share value of shares received | ₨ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₨ 1
Per share value of shares held for each set of shares received | ₨ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₨ 2
Pro forma Advances and debt including its related tax effects |  |  |  |  |  |  |  | ₨ 36,984,300 |  | $ 432.9 |  |  | ₨ 41,204,200 | $ 482.3 |
eHDFC [Member] | Equity Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ownership interest of the bank's largest shareholder |  | 20.80% | 20.80% |  |  |  |  |  |  |  |  |  |  |  |
eHDFC [Member] | HDFC Credila Financial Services Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, assets |  | ₨ 103,500,000 |  |  |  |  |  |  |  |  | 1,211.5 |  |  |  |
Goodwill written off related to sale of business unit | ₨ 73,576,100 | 73,576,100 | $ 861.2 |  |  |  |  |  |  |  |  |  |  |  |
eHDFC [Member] | HDFC Credila Financial Services Limited [Member] | Brand [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets written off related to sale of business unit |  | 8,527,500 | 99.9 |  |  |  |  |  |  |  |  |  |  |  |
eHDFC [Member] | HDFC Credila Financial Services Limited [Member] | Distribution Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets written off related to sale of business unit |  | 8,972,400 | $ 105.0 |  |  |  |  |  |  |  |  |  |  |  |
eHDFC [Member] | HDFC Education and Development Services Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, assets |  | 1,976,000 |  |  |  |  |  |  |  |  | 23.1 |  |  |  |
Goods and Service Tax [Member] | eHDFC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination recognized identifiable asset acquired and liabilities assumed contingent liability |  | ₨ 11,063,000 |  |  |  |  |  |  |  |  | $ 129.5 |  |  |  |

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