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Financial Instruments - Summary of Foreign Currency Risk from Non-derivative Financial Instruments (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨)
--- | --- | --- | --- | ---
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | ₨ 104,862 |  | ₨ 105,436 |
Cash and cash equivalent | 158,529 | $ 2,292 | 44,925 | ₨ 52,710
Other assets | 58,715 |  | 46,322 |
Loans, borrowings and bank overdrafts | (99,467) |  | (138,259) |
Currency risk [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 62,088 |  | 54,906 |
Unbilled receivables | 14,965 |  | 25,694 |
Contract assets | 10,005 |  |  |
Cash and cash equivalent | 31,589 |  | 17,681 |
Other assets | 20,397 |  | 26,413 |
Loans, borrowings and bank overdrafts | (50,611) |  | (49,637) |
Trade payables, accrued expenses and other liabilities | (42,746) |  | (38,591) |
Net assets/ (liabilities) | 45,687 |  | 36,466 |
U.S.Dollar [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 39,896 |  | 32,948 |
Unbilled receivables | 8,038 |  | 13,893 |
Contract assets | 4,706 |  |  |
Cash and cash equivalent | 21,997 |  | 9,144 |
Other assets | 8,553 |  | 13,796 |
Loans, borrowings and bank overdrafts | (50,516) |  | (49,257) |
Trade payables, accrued expenses and other liabilities | (27,202) |  | (23,561) |
Net assets/ (liabilities) | (5,472) |  | (3,037) |
EURO [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 8,030 |  | 7,273 |
Unbilled receivables | 1,609 |  | 2,571 |
Contract assets | 1,445 |  |  |
Cash and cash equivalent | 2,884 |  | 3,791 |
Other assets | 1,173 |  | 1,993 |
Loans, borrowings and bank overdrafts | (20) |  | (41) |
Trade payables, accrued expenses and other liabilities | (5,779) |  | (3,962) |
Net assets/ (liabilities) | 9,342 |  | 11,625 |
Great British Pound [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 5,212 |  | 6,585 |
Unbilled receivables | 3,146 |  | 5,189 |
Contract assets | 2,270 |  |  |
Cash and cash equivalent | 1,573 |  | 1,685 |
Other assets | 4,056 |  | 4,061 |
Loans, borrowings and bank overdrafts | (21) |  | (37) |
Trade payables, accrued expenses and other liabilities | (4,646) |  | (5,958) |
Net assets/ (liabilities) | 11,590 |  | 11,525 |
Australian Dollar [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 3,542 |  | 3,459 |
Unbilled receivables | 1,225 |  | 2,094 |
Contract assets | 836 |  |  |
Cash and cash equivalent | 1,003 |  | 786 |
Other assets | 1,038 |  | 1,164 |
Loans, borrowings and bank overdrafts | (33) |  | (165) |
Trade payables, accrued expenses and other liabilities | (1,526) |  | (1,516) |
Net assets/ (liabilities) | 6,085 |  | 5,822 |
Canadian Dollar [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 1,528 |  | 990 |
Unbilled receivables | 204 |  | 338 |
Contract assets | 150 |  |  |
Cash and cash equivalent | 1,928 |  | 34 |
Other assets | 1,033 |  | 940 |
Trade payables, accrued expenses and other liabilities | (806) |  | (652) |
Net assets/ (liabilities) | 4,037 |  | 1,650 |
Other currencies [member] |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |
Trade receivables | 3,880 |  | 3,651 |
Unbilled receivables | 743 |  | 1,609 |
Contract assets | 598 |  |  |
Cash and cash equivalent | 2,204 |  | 2,241 |
Other assets | 4,544 |  | 4,459 |
Loans, borrowings and bank overdrafts | (21) |  | (137) |
Trade payables, accrued expenses and other liabilities | (2,787) |  | (2,942) |
Net assets/ (liabilities) | ₨ 9,161 |  | ₨ 8,881 |

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