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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, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance | ₨ 760,640 |  |
Ending balance | 833,171 | $ 12,045 | ₨ 760,640
Beginning balance | (275,294) |  |
Ending balance | (262,418) | $ (3,793) | (275,294)
Level 3 [member] | Investments in equity instruments [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance | 5,685 |  | 5,303
Additions | 2,869 |  | 1,851
Payouts |  |  | 0
Transferred to Investments accounted for using the equity method | (647) |  | (357)
Disposal | (1,341) |  |
Gain/loss recognized in foreign currency translation reserve | 203 |  | 53
Gain/loss recognized in other comprehensive income | (101) |  | (1,165)
Finance expense recognized in consolidated statement of income |  |  | 0
Ending balance | 6,668 |  | 5,685
Level 3 [member] | Derivative Assets - Others [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance |  |  | 426
Payouts |  |  | 0
Gain/loss recognized in consolidated statement of income |  |  | (426)
Finance expense recognized in consolidated statement of income |  |  | 0
Level 3 [member] | Contingent consideration [member] |  |  |
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Beginning balance |  |  | (339)
Additions | 0 |  | 0
Disposal |  |  | 164
Transferred to Investments accounted for using the equity method | 0 |  | 0
Gain/loss recognized in consolidated statement of income |  |  | 167
Gain/loss recognized in foreign currency translation reserve |  |  | (32)
Gain/loss recognized in other comprehensive income | ₨ 0 |  | 0
Finance expense recognized in consolidated statement of income |  |  | ₨ 40

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