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Changes in Accumulated Other Comprehensive Income After Tax (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | ₨ 870,795.2 |  | ₨ 751,567.6
Net unrealized gain/(loss) arising during the period | 17,701.5 |  | 4,803.2
Amounts reclassified to income | (3,185.2) |  | (4,114.3)
Balance | 1,027,901.1 | $ 15,850.5 | 870,795.2
Available for Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 10,707.6 |  | 10,259.0
Net unrealized gain/(loss) arising during the period | 17,910.7 |  | 4,562.9
Amounts reclassified to income | (3,185.2) |  | (4,114.3)
Balance | 25,433.1 | 392.2 | 10,707.6
Foreign Currency Translation Reserve |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 807.7 |  | 567.4
Net unrealized gain/(loss) arising during the period | (209.2) |  | 240.3
Amounts reclassified to income | 0.0 |  | 0.0
Balance | 598.5 | 9.2 | 807.7
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 11,515.3 |  | 10,826.4
Balance | ₨ 26,031.6 | $ 401.4 | ₨ 11,515.3

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