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Related Party Transactions - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2020 INR (₨) | Mar. 31, 2022 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |
Purchase of investments from others | ₨ 2,006.2 |  | ₨ 114.3 |  |
Sale of investments from others | 28,877.9 |  | 29,451.1 |  |
Investments of others | 722,908.9 | $ 9,528.3 | 481,989.2 | ₨ 272,104.7 |
Dividend paid to principal owner | 36,239.2 | $ 477.6 | 166.6 | ₨ 66,447.3 |
Foreign exchange and derivative contracts, notional principal amount | 12,488,223.5 |  | 8,580,508.8 |  | $ 164,600.4
Bank guarantees | 1,455,273.0 |  | 1,131,739.2 |  | $ 19,181.1
Tier II bonds |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investments of others | 3,700.0 |  | 400.0 |  |
Principal Owner |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans purchased from principal owner | 282,052.4 |  | 189,797.8 |  |
Dividend paid to principal owner | 5,620.0 |  | 0.0 |  |
Foreign exchange and derivative contracts, notional principal amount | 111,787.1 |  | 77,574.9 |  |
Foreign exchange and derivative contracts, mark to market gains | 1,101.1 |  | 833.0 |  |
Bank guarantees | 3.9 |  | 4.0 |  |
Principal Owner | Property Plant and equipment |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fixed assets purchased from related parties | 0.0 |  | 0.0 |  |
Others |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Bank guarantees | ₨ 28.0 |  | ₨ 44.3 |  |

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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