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Financial Instruments - Summary of Foreign Currency Risk from Non-derivative Financial Instruments (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨)
--- | --- | --- | --- | ---
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | ₨ 105,436 |  | ₨ 98,844 |
Unbilled revenues | 42,486 | $ 653 | 45,095 |
Cash and cash equivalent | 44,925 | $ 690 | 52,710 | ₨ 99,049
Other assets | 46,322 |  | 47,544 |
Loans and borrowings | (138,259) |  | (142,412) |
Currency risk [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 54,906 |  | 50,784 |
Unbilled revenues | 25,694 |  | 28,621 |
Cash and cash equivalent | 17,681 |  | 18,513 |
Other assets | 5,613 |  | 5,174 |
Loans and borrowings | (49,637) |  | (60,929) |
Trade payables, accrued expenses and other liabilities | (38,103) |  | (35,260) |
Net assets/ (liabilities) | 16,154 |  | 6,903 |
U.S.Dollar [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 32,948 |  | 33,388 |
Unbilled revenues | 13,893 |  | 15,839 |
Cash and cash equivalent | 9,144 |  | 15,752 |
Other assets | 1,879 |  | 1,612 |
Loans and borrowings | (49,257) |  | (58,785) |
Trade payables, accrued expenses and other liabilities | (23,561) |  | (22,339) |
Net assets/ (liabilities) | (14,954) |  | (14,533) |
EURO [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 7,273 |  | 4,663 |
Unbilled revenues | 2,571 |  | 2,801 |
Cash and cash equivalent | 3,791 |  | 1,178 |
Other assets | 1,993 |  | 1,437 |
Loans and borrowings | (41) |  | (494) |
Trade payables, accrued expenses and other liabilities | (3,474) |  | (4,284) |
Net assets/ (liabilities) | 12,113 |  | 5,301 |
Great British Pound [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 6,585 |  | 5,078 |
Unbilled revenues | 5,189 |  | 4,454 |
Cash and cash equivalent | 1,685 |  | 571 |
Other assets | 285 |  | 190 |
Loans and borrowings | (37) |  | (604) |
Trade payables, accrued expenses and other liabilities | (5,958) |  | (4,605) |
Net assets/ (liabilities) | 7,749 |  | 5,084 |
Australian Dollar [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 3,459 |  | 2,547 |
Unbilled revenues | 2,094 |  | 2,024 |
Cash and cash equivalent | 786 |  | 335 |
Other assets | 1,122 |  | 1,568 |
Loans and borrowings | (165) |  | (537) |
Trade payables, accrued expenses and other liabilities | (1,516) |  | (1,453) |
Net assets/ (liabilities) | 5,780 |  | 4,484 |
Canadian Dollar [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 990 |  | 890 |
Unbilled revenues | 338 |  | 577 |
Cash and cash equivalent | 34 |  | 2 |
Other assets | 1 |  | 7 |
Trade payables, accrued expenses and other liabilities | (652) |  | (443) |
Net assets/ (liabilities) | 711 |  | 1,033 |
Other currencies [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 3,651 |  | 4,218 |
Unbilled revenues | 1,609 |  | 2,926 |
Cash and cash equivalent | 2,241 |  | 675 |
Other assets | 333 |  | 360 |
Loans and borrowings | (137) |  | (509) |
Trade payables, accrued expenses and other liabilities | (2,942) |  | (2,136) |
Net assets/ (liabilities) | ₨ 4,755 |  | ₨ 5,534 |

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