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Financial Instruments - Summary of Details of Assets and Liabilities Considered under Level 3 Classification (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance | ₨ 793,516 |  |
Ending balance | 760,640 | $ 11,684 | ₨ 793,516
Beginning balance | (270,821) |  |
Ending balance | (275,294) | $ (4,230) | (270,821)
Level 3 [member] | Investments in equity instruments [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance | 5,303 |  | 4,907
Additions | 1,851 |  | 620
Payouts | 0 |  | 0
Transferred to investment in equity accounted investee | (357) |  |
Gain/loss recognized in foreign currency translation reserve | 53 |  | (41)
Gain/loss recognized in other comprehensive income | (1,165) |  | (183)
Finance expense recognized in consolidated statement of income | 0 |  | 0
Ending balance | 5,685 |  | 5,303
Level 3 [member] | Derivative Assets - Others [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance | 426 |  | 558
Payouts | 0 |  | 0
Gain/loss recognized in consolidated statement of income | (426) |  | (132)
Finance expense recognized in consolidated statement of income | 0 |  | 0
Ending balance |  |  | 426
Level 3 [member] | Contingent consideration [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance | (339) |  | (2,251)
Additions | 0 |  | 0
Payouts | (164) |  | 138
Transferred to investment in equity accounted investee | 0 |  |
Gain/loss recognized in consolidated statement of income | 167 |  | 1,546
Gain/loss recognized in foreign currency translation reserve | (32) |  | 198
Gain/loss recognized in other comprehensive income | 0 |  | 0
Finance expense recognized in consolidated statement of income | ₨ 40 |  | 30
Ending balance |  |  | ₨ (339)

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