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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, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | Mar. 31, 2015 INR (₨)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ (5,738.5) | $ (88.5) | ₨ 15,067.2 | ₨ (7,393.0)
Interest rate derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 399.3 | 6.2 | (1,063.1) | (383.4)
Forward rate agreements |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 1.2 | 0.0 | 2.1 | 3.0
Currency options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | 677.7 | 10.4 | 413.4 | 303.0
Currency swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | (2,453.4) | (37.8) | 829.5 | 151.3
Forward exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives gain/(loss), net | ₨ (4,363.3) | $ (67.3) | ₨ 14,885.3 | ₨ (7,466.9)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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