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Related Party Relationships and Transactions - Summary of Related Party Transactions (Parenthetical) (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of transactions between related parties [line items]      
Share based compensation ₨ 1,347 ₨ 1,742 ₨ 1,534
Other benefits [member]      
Disclosure of transactions between related parties [line items]      
Share based compensation ₨ 124 ₨ 148 ₨ 126