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Comparison of Fair Values and Carrying Values of Financial Instruments (Parenthetical) (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments, at cost | ₨ 708.4 | $ 10.9 | ₨ 708.2

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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