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Investments - Schedule of Investment (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial instruments at FVTOCI | ₨ 191,964 |  | ₨ 181,919
Financial instruments at amortized cost |  |  |
Financial instruments at amortized cost | 21,708 |  | 28,405
Non current investments other than investments accounted for using equity method | 6,916 | $ 100 | 7,668
Current Investments | 220,716 | $ 3,191 | 249,094
Total | 227,632 |  | 256,762
Financial instruments at FVTPL |  |  |
Financial instruments at FVTPL | 13,960 |  | 46,438
Non-current assets [member] |  |  |
Financial instruments at amortized cost |  |  |
Non current investments other than investments accounted for using equity method | 6,916 |  | 7,668
Current Assets [member] |  |  |
Financial instruments at amortized cost |  |  |
Current Investments | 220,716 |  | 249,094
Investments in equity instruments [member] | Non-current assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial instruments at FVTOCI | 6,916 |  | 4,140
Investments in equity instruments [member] | Current Assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial instruments at FVTOCI |  |  | 1,545
Inter corporate and term deposits [member] | Non-current assets [member] |  |  |
Financial instruments at amortized cost |  |  |
Financial instruments at amortized cost |  |  | 3,528
Inter corporate and term deposits [member] | Current Assets [member] |  |  |
Financial instruments at amortized cost |  |  |
Financial instruments at amortized cost | 21,708 |  | 24,877
Investment in liquid and short-term mutual funds [member] | Current Assets [member] |  |  |
Financial instruments at FVTPL |  |  |
Financial instruments at FVTPL | 13,960 |  | 46,438
Commercial paper, certificate of deposits and bonds [member] | Current Assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial instruments at FVTOCI | ₨ 185,048 |  | ₨ 176,234

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- Definition The amount of current investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of non-current investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Non-current assets; Investments other than investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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