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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, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2019 INR (₨)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ (3,253.0) | $ (44.5) | ₨ 3,550.0 | ₨ 12,409.1
Interest rate derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 773.9 | 10.6 | (2,572.2) | 736.4
Forward rate agreements |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 205.9 | 2.8 | 0.0 | 0.1
Currency options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 1,191.1 | 16.2 | 585.5 | (262.5)
Currency swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | (3,309.2) | (45.2) | 3,465.5 | 1,045.0
Forward exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ (2,114.7) | $ (28.9) | ₨ 2,071.2 | ₨ 10,890.1

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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 http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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