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Loans and Borrowings - Summary of Long - Term Loans and Borrowings (Detail) € in Millions, ₨ in Millions, ر.س in Millions, £ in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
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Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 AUD ($) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 BRL (R$) | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 EUR (€) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 AUD ($) | Mar. 31, 2017 GBP (£) | Mar. 31, 2017 SAR (ر.س) | Mar. 31, 2017 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 54,688 |  |  |  |  | ₨ 17,391 |  |  |  |  |  |
Obligations under finance leases | 5,442 |  |  |  |  | 8,280 |  |  |  |  |  |
Liabilities directly associated with assets held for sale | (1,469) |  |  |  |  |  |  |  |  |  |  |
Finance lease liabilities | 3,973 |  |  |  |  | 8,280 |  |  |  |  |  |
Total | 58,661 |  |  |  |  | 25,671 |  |  |  |  |  |
Non-current portion of long term loans and borrowings | 45,268 | $ 695 |  |  |  | 19,611 |  |  |  |  |  |
Current portion of long term loans and borrowings | 13,393 |  |  |  |  | 6,060 |  |  |  |  |  |
Total | 58,661 |  |  |  |  | 25,671 |  |  |  |  |  |
Unsecured external commercial borrowing 1.81% June 2018 [member] | U.S.Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 9,777 | $ 150 |  |  |  | 9,728 |  | $ 150 |  |  |  |
Interest rate | 1.94% | 1.94% | 1.94% | 1.94% | 1.94% |  |  |  |  |  |  |
Final maturity | June 2018 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | U.S.Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 40,715 | $ 625 |  |  |  | 118 |  | $ 2 |  |  |  |
Final maturity | June 2021 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | U.S.Dollar [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 1.90% | 1.90% | 1.90% | 1.90% | 1.90% |  |  |  |  |  |  |
Unsecured term loan [member] | U.S.Dollar [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.81% | 3.81% | 3.81% | 3.81% | 3.81% |  |  |  |  |  |  |
Unsecured term loan [member] | Canadian Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 3,660 |  |  | $ 72 |  | 4,131 |  |  |  |  |  | $ 85
Final maturity | July 2021 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | Canadian Dollar [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 1.20% | 1.20% | 1.20% | 1.20% | 1.20% |  |  |  |  |  |  |
Unsecured term loan [member] | Canadian Dollar [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.26% | 3.26% | 3.26% | 3.26% | 3.26% |  |  |  |  |  |  |
Unsecured term loan [member] | Indian Rupee [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 366 |  |  |  |  | 714 |  |  |  |  |  |
Final maturity | December 2021 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | Indian Rupee [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 8.30% | 8.30% | 8.30% | 8.30% | 8.30% |  |  |  |  |  |  |
Unsecured term loan [member] | Indian Rupee [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 9.40% | 9.40% | 9.40% | 9.40% | 9.40% |  |  |  |  |  |  |
Unsecured term loan [member] | Australian Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 92 |  | $ 2 |  |  | 116 |  |  | $ 2 |  |  |
Interest rate | 4.65% | 4.65% | 4.65% | 4.65% | 4.65% |  |  |  |  |  |  |
Final maturity | January 2022 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | Great British Pound [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 42 |  |  |  |  | 73 |  |  |  | £ 1 |  |
Interest rate | 2.93% | 2.93% | 2.93% | 2.93% | 2.93% |  |  |  |  |  |  |
Final maturity | February 2022 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | EURO [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 24 |  |  |  |  | 1,282 | € 19 |  |  |  |  |
Interest rate | 2.98% | 2.98% | 2.98% | 2.98% | 2.98% |  |  |  |  |  |  |
Final maturity | December 2020 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | Brazil, Brazil Real |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans | ₨ 12 |  |  |  | R$ 1 |  |  |  |  |  |  |
Interest rate | 14.04% | 14.04% | 14.04% | 14.04% | 14.04% |  |  |  |  |  |  |
Final maturity | May 2019 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan [member] | Saudi Arabian Riyal [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loans |  |  |  |  |  | ₨ 1,229 |  |  |  |  | ر.س 71 |

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