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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, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ 6,742.6 | $ 103.6 | ₨ (5,738.5) | ₨ 15,067.2
Interest rate derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 1,027.5 | 15.8 | 399.3 | (1,063.1)
Forward rate agreements |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 0.5 | 0.0 | 1.2 | 2.1
Currency options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | (15.0) | (0.2) | 677.7 | 413.4
Currency swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | (1,706.9) | (26.2) | (2,453.4) | 829.5
Forward exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ 7,436.5 | $ 114.2 | ₨ (4,363.3) | ₨ 14,885.3

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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=109980867&loc=SL5618551-113959 + Details
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