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Reconciliation of All Plan Investment Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Plan investment funds managed by insurance companies - Other Funds ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Beginning balance | ₨ 489.2 | $ 7.4 | ₨ 404.0
Realized interest credited to fund | 53.3 | 0.8 | 0.0
Contribution during the period | 61.6 | 0.9 | 140.8
Amount paid towards claim | (172.9) | (2.6) | (55.6)
Ending Balance | ₨ 431.2 | $ 6.5 | ₨ 489.2

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