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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, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ 3,550.0 | $ 47.1 | ₨ 12,409.1 | ₨ 6,742.6
Interest rate derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | (2,572.2) | (34.1) | 736.4 | 1,027.5
Forward rate agreements |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 0.0 | 0.0 | 0.1 | 0.5
Currency options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 585.5 | 7.7 | (262.5) | (15.0)
Currency swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 3,465.5 | 46.0 | 1,045.0 | (1,706.9)
Forward exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ 2,071.2 | $ 27.5 | ₨ 10,890.1 | ₨ 7,436.5

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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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