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Financial Instruments - Additional Information (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
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 of March 31, 2018 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 of March 31, 2017 and 2018 or for revenues for the year ended March 31, 2016, 2017 and 2018. |
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 | 100000000.00% | 100000000.00%
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments | ₨ 162 | ₨ 69
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 | ₨ 1,500 | ₨ 1,155
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments in statement of income | 414 | 139
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments in other comprehensive income | 1,086 | ₨ 1,016
Interest rate risk [member] | Floating Interest Rate [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Annual interest expense | ₨ 1,186 |

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