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Financial Instruments - Summary of Foreign Currency Risk from Non-derivative Financial Instruments (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Apr. 01, 2019 INR (₨) | Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨)
--- | --- | --- | --- | --- | ---
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | ₨ 110,523 |  |  | ₨ 104,862 |
Cash and cash equivalents | 144,499 | $ 1,917 |  | 158,529 | ₨ 44,925
Other assets | 14,495 |  |  | 19,757 |
Loans, borrowings and bank overdrafts | (78,042) |  |  | (99,467) |
Lease liabilities | (19,198) |  | ₨ (15,379) |  |
Currency risk [member] |  |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | 67,878 |  |  | 62,088 |
Unbilled receivables | 16,579 |  |  | 14,965 |
Contract assets | 11,516 |  |  | 10,005 |
Cash and cash equivalents | 22,767 |  |  | 31,589 |
Other assets | 61,097 |  |  | 20,397 |
Loans, borrowings and bank overdrafts | (36,578) |  |  | (50,611) |
Lease liabilities | (8,014) |  |  |  |
Trade payables, accrued expenses and other liabilities | (39,514) |  |  | (42,746) |
Net assets/ (liabilities) | 95,731 |  |  | 45,687 |
U.S.Dollar [member] |  |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | 42,329 |  |  | 39,896 |
Unbilled receivables | 11,127 |  |  | 8,038 |
Contract assets | 5,517 |  |  | 4,706 |
Cash and cash equivalents | 13,481 |  |  | 21,997 |
Other assets | 49,835 |  |  | 8,553 |
Loans, borrowings and bank overdrafts | (36,578) |  |  | (50,516) |
Lease liabilities | (3,393) |  |  |  |
Trade payables, accrued expenses and other liabilities | (27,457) |  |  | (27,202) |
Net assets/ (liabilities) | 54,861 |  |  | 5,472 |
EURO [member] |  |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | 8,860 |  |  | 8,030 |
Unbilled receivables | 1,030 |  |  | 1,609 |
Contract assets | 1,559 |  |  | 1,445 |
Cash and cash equivalents | 3,978 |  |  | 2,884 |
Other assets | 4,314 |  |  | 1,173 |
Loans, borrowings and bank overdrafts |  |  |  | (20) |
Lease liabilities | (2,606) |  |  |  |
Trade payables, accrued expenses and other liabilities | (3,419) |  |  | (5,779) |
Net assets/ (liabilities) | 13,716 |  |  | 9,342 |
Great British Pound [member] |  |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | 7,735 |  |  | 5,212 |
Unbilled receivables | 2,221 |  |  | 3,146 |
Contract assets | 2,850 |  |  | 2,270 |
Cash and cash equivalents | 1,697 |  |  | 1,573 |
Other assets | 3,283 |  |  | 4,056 |
Loans, borrowings and bank overdrafts |  |  |  | (21) |
Lease liabilities | (373) |  |  |  |
Trade payables, accrued expenses and other liabilities | (3,718) |  |  | (4,646) |
Net assets/ (liabilities) | 13,695 |  |  | 11,590 |
Australian Dollar [member] |  |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | 3,044 |  |  | 3,542 |
Unbilled receivables | 784 |  |  | 1,225 |
Contract assets | 654 |  |  | 836 |
Cash and cash equivalents | 586 |  |  | 1,003 |
Other assets | 413 |  |  | 1,038 |
Loans, borrowings and bank overdrafts |  |  |  | (33) |
Lease liabilities | (214) |  |  |  |
Trade payables, accrued expenses and other liabilities | (1,228) |  |  | (1,526) |
Net assets/ (liabilities) | 4,039 |  |  | 6,085 |
Canadian Dollar [member] |  |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | 1,388 |  |  | 1,528 |
Unbilled receivables | 291 |  |  | 204 |
Contract assets | 146 |  |  | 150 |
Cash and cash equivalents | 1,292 |  |  | 1,928 |
Other assets | 1,447 |  |  | 1,033 |
Lease liabilities | (16) |  |  |  |
Trade payables, accrued expenses and other liabilities | (605) |  |  | (806) |
Net assets/ (liabilities) | 3,943 |  |  | 4,037 |
Other currencies [member] |  |  |  |  |
Disclosure of foreign currency exchange risk on financial instruments [line items] |  |  |  |  |
Trade receivables | 4,522 |  |  | 3,880 |
Unbilled receivables | 1,126 |  |  | 743 |
Contract assets | 790 |  |  | 598 |
Cash and cash equivalents | 1,733 |  |  | 2,204 |
Other assets | 1,805 |  |  | 4,544 |
Loans, borrowings and bank overdrafts |  |  |  | (21) |
Lease liabilities | (1,412) |  |  |  |
Trade payables, accrued expenses and other liabilities | (3,087) |  |  | (2,787) |
Net assets/ (liabilities) | ₨ 5,477 |  |  | ₨ 9,161 |

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