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Financial Instruments - Summary of Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value of Recurring Basis (Detail) - Fair value measurements at reporting date using [member] - INR (₨) ₨ in Millions | Mar. 31, 2018 | Mar. 31, 2017
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Contingent consideration [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial liabilities |  | ₨ (339)
Cash flow hedges [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | ₨ 1,139 | 7,307
Fair value of financial liabilities | (1,276) | (55)
Level 2 [member] | Cash flow hedges [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 1,139 | 7,307
Fair value of financial liabilities | (1,276) | (55)
Level 3 [member] | Contingent consideration [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial liabilities |  | (339)
Derivative Assets - Others [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 134 | 2,546
Fair value of financial liabilities | (941) | (2,655)
Derivative Assets - Others [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 134 | 2,120
Fair value of financial liabilities | (941) | (2,655)
Derivative Assets - Others [member] | Level 3 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets |  | 426
Investment in liquid and short-term mutual funds [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 46,438 | 104,675
Investment in liquid and short-term mutual funds [member] | Level 1 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 46,438 | 104,675
Other Investments [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets |  | 569
Other Investments [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets |  | 569
Investments in equity instruments [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 5,685 | 5,303
Investments in equity instruments [member] | Level 3 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 5,685 | 5,303
Commercial paper, certificate of deposits and bonds [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 176,234 | 145,614
Commercial paper, certificate of deposits and bonds [member] | Level 1 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 1,951 |
Commercial paper, certificate of deposits and bonds [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | ₨ 174,283 | ₨ 145,614

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