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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, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Beginning balance | ₨ 431.2 | $ 6.6 | ₨ 489.2
Realized interest credited to fund | 47.8 | 0.7 | 53.3
Contribution during the period | 124.4 | 1.9 | 61.6
Amount paid towards claim | (145.7) | (2.1) | (172.9)
Ending Balance | ₨ 457.7 | $ 7.1 | ₨ 431.2

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