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Additional Capital Disclosures - Summary of Capital Structure (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
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Capital structure [abstract] |  |  |
Equity attributable to the equity shareholders of the Company | ₨ 482,936 | $ 7,417 | ₨ 520,304
As percentage of total capital | 78.00% | 78.00% | 79.00%
Current loans and borrowings | ₨ 92,991 | $ 1,428 | ₨ 122,801
Non-current loans and borrowings | 45,268 | $ 695 | 19,611
Total loans and borrowings | ₨ 138,259 |  | ₨ 142,412
As percentage of total capital | 22.00% | 22.00% | 21.00%
Total capital (loans and borrowings and equity) | ₨ 621,195 |  | ₨ 662,716
Percentage of change, Equity attributable to the equity shareholders of the Company | (7.18%) | (7.18%) |
Percentage of change, Total loans and borrowings | (2.92%) | (2.92%) |
Percentage of change, Total capital (loans and borrowings and equity) | (6.27%) | (6.27%) |

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