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Information Related to Derivative Amounts Recognized in Income (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2020 INR (₨)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ 1,422.0 | $ 18.7 | ₨ (3,253.0) | ₨ 3,550.0
Interest rate derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 3,207.7 | 42.3 | 773.9 | (2,572.2)
Forward rate agreements |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 1,374.1 | 18.1 | 205.9 | 0.0
Currency options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 167.3 | 2.2 | 1,191.1 | 585.5
Currency swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | (1,682.0) | (22.2) | (3,309.2) | 3,465.5
Forward exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ (1,645.1) | $ (21.7) | ₨ (2,114.7) | ₨ 2,071.2

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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