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Financial Instruments - Additional Information (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
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, 2020 are expected to occur and be reclassified to the consolidated statement of income over a period of three years. |
Description of concentration of risk | No single customer accounted for more than 10% of the accounts receivable as at March 31, 2019 and 2020, or revenues for the year ended March 31, 2018, 2019 and 2020. |
Interest rate risk [member] | Floating Interest Rate [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Annual interest expense | ₨ 773 |
Currency risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Decrease/increase in the fair value of foreign currency dollar denominated derivative instruments | ₨ 957 | ₨ 457
Increase/decrease in respective foreign currencies compared to functional currency | 1.00% | 1.00%
Increase in spot exchange rate of the Indian rupee with the U.S. dollar | ₨ 1 |
Decrease in spot exchange rate of the Indian rupee with the U.S. dollar | 1 |
Currency risk [member] | Indian Rupee [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase in the fair value of foreign currency dollar denominated derivative instruments | 1,972 |
Decrease in the fair value of foreign currency dollar denominated derivative instruments | 1,912 |
Increase in the fair value of foreign currency dollar denominated derivative instruments in statement of income | 658 |
Decrease in the fair value of foreign currency dollar denominated derivative instruments in statement of income | 658 |
Increase in the fair value of foreign currency dollar denominated derivative instruments in other comprehensive income | 1,314 |
Decrease in the fair value of foreign currency dollar denominated derivative instruments in other comprehensive income | ₨ 1,254 |

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