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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 (₨)
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%)