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Goodwill and Intangible Assets - Summary of Movement in Intangible Assets (Parenthetical) (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Impairment charge ₨ 643 ₨ 3,056 ₨ 0