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Other Operating Income - Summary of Gain Loss on Sale of Business (Parenthetical) (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2018
INR (₨)
Disclosure of other operating income [line items]        
Goodwill ₨ 116,980 ₨ 131,012 $ 1,738 ₨ 117,584
Intangible assets 13,762 ₨ 16,362 $ 217  
Hosted data center services business [member]        
Disclosure of other operating income [line items]        
Disposal costs 660      
Goodwill 13,009      
Workday business [member]        
Disclosure of other operating income [line items]        
Goodwill 4,893      
Intangible assets ₨ 740