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Financial Instruments - Additional Information (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |
Cash flow hedging reserve description | The related hedge transactions for balance in cash flow hedging reserves as at March 31, 2019 are expected to occur and be reclassified to the consolidated statement of income over a period of two years. |
Description of concentration of risk | No single customer accounted for more than 10% of the accounts receivable as at March 31, 2018 and 2019, respectively, or revenues for the year ended March 31, 2017, 2018 and 2019 |
Interest rate risk [member] | Floating Interest Rate [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Annual interest expense | ₨ 866 |
Currency risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase/decrease in spot exchange rate of the Indian rupee with the U.S. dollar | 1 | ₨ 1
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments | ₨ 457 | ₨ 365
Increase/decrease in respective foreign currencies compared to functional currency | 1.00% | 1.00%
Currency risk [member] | Indian Rupee [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments | ₨ 2,002 | ₨ 1,500
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments in statement of income | 602 | 414
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments in other comprehensive income | ₨ 1,400 | ₨ 1,086

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- Definition Increase/decrease in spot exchange rate of the Indian rupee with U.S. dollar + References No definition available. + Details
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