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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, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Beginning balance | ₨ 457.7 | $ 7.0 | ₨ 431.2
Realized interest credited to fund | 40.6 | 0.6 | 47.8
Contribution during the period | 93.2 | 1.4 | 124.4
Amount paid towards claim | (71.6) | (1.0) | (145.7)
Ending Balance | ₨ 519.9 | $ 8.0 | ₨ 457.7

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