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Loans and Borrowings - Additional Information (Detail) € in Millions, ₨ in Millions, ر.س in Millions, £ in Millions, Rp in Millions, $ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨) | Mar. 31, 2018 EUR (€) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 GBP (£) | Mar. 31, 2018 SAR (ر.س) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 IDR (Rp)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Obligations under finance leases | ₨ 5,442 | ₨ 8,280 |  |  |  |  |  |
Interest expense | ₨ 3,045 | 1,916 |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Finance lease contract term | 1 year |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Finance lease contract term | 5 years |  |  |  |  |  |  |
Bank overdraft [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | ₨ 79,598 | 116,742 |  |  |  |  |  |
Line of credit [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | 10,000 |  |  |  |  |  |  |
Line of credit [member] | U.S.Dollar [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | $ |  |  |  | $ 1,748 |  |  |  |
Remaining borrowing capacity | $ |  |  |  | $ 711 |  |  |  |
Line of credit [member] | Canadian Dollar [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | $ |  |  |  |  |  |  | $ 57 |
Remaining borrowing capacity | $ |  |  |  |  |  |  | $ 27 |
Line of credit [member] | EURO [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | € |  |  | € 19 |  |  |  |  |
Remaining borrowing capacity | € |  |  | € 2 |  |  |  |  |
Line of credit [member] | Great British Pound [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | £ |  |  |  |  | £ 43 |  |  |
Remaining borrowing capacity | £ |  |  |  |  | £ 42 |  |  |
Line of credit [member] | Indonesia, Rupiahs |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | Rp |  |  |  |  |  |  |  | Rp 13,000
Remaining borrowing capacity | Rp |  |  |  |  |  |  |  | Rp 13,000
Line of credit [member] | Saudi Arabian Riyal [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | ر.س |  |  |  |  |  | ر.س 43 |  |
Remaining borrowing capacity | ر.س |  |  |  |  |  | ر.س 39 |  |
Line of credit [member] | Indian Rupee [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Remaining borrowing capacity | 1,003 |  |  |  |  |  |  |
Revolving credit facilities non-fund based [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Short-term borrowings | 44,022 | 51,739 |  |  |  |  |  |
Remaining borrowing capacity | ₨ 22,476 | ₨ 29,716 |  |  |  |  |  |

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