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Comparison of Fair Values and Carrying Values of Financial Instruments (Parenthetical) (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments, at cost | ₨ 708.2 | $ 10.9 | ₨ 708.8

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