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Goodwill and Intangible Assets - Summary of Movement in Goodwill Balance (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Reconciliation of changes in goodwill [abstract]      
Balance at the beginning of the year ₨ 125,796   ₨ 101,991
Translation adjustment 2,970   (4,319)
Acquisition through business combination 1,172   28,124
Assets reclassified as held for sale (12,354)    
Balance at the end of the year ₨ 117,584 $ 1,806 ₨ 125,796