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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨) | Jan. 31, 2018 INR (₨) | Dec. 31, 2017 INR (₨) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 INR (₨) | Mar. 31, 2011 INR (₨)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Rental payments under lease agreement | ₨ 6,236,000,000 | ₨ 5,953,000,000 | ₨ 5,184,000,000 |  |  |  |  |
Operating lease agreements term | 15 years |  |  |  |  |  |  |
Capital commitments | ₨ 13,091,000,000 | 12,238,000,000 |  |  |  |  |  |
Financial guarantee amount | 21,546,000,000 | 22,023,000,000 |  |  |  |  |  |
Tax contingent liability [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Contingent tax liability | 101,440,000,000 | 89,623,000,000 |  |  |  |  | ₨ 3,286,000,000 | ₨ 47,583,000,000
Interest on contingent tax liability |  |  |  |  |  |  | ₨ 1,166,000,000 | ₨ 13,832,000,000
Contingent liability |  |  | 0 |  |  |  |  |
Tax contingent liability [member] | Dispute resolution panel [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Contingent tax liability |  |  | 4,241,000,000 | ₨ 8,701,000,000 |  |  |  |
Interest on contingent tax liability |  |  | ₨ 1,376,000,000 | ₨ 2,700,000,000 |  |  |  |
Excise duty, Custom duty, sales tax and other matters [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Contingent tax liability | ₨ 7,745,000,000 | ₨ 7,242,000,000 |  |  |  |  |  |
Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  | ₨ 9,124,000,000 | $ 140 |  |

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