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Business Combination - Schedule of Allocation of Purchase Price in Net Assets Include both Financial and Non Financial Assets (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Disclosure of detailed information about business combination [line items]        
Net assets ₨ 907      
Customer related intangibles 4,535      
Marketing related intangibles 371      
Deferred tax liabilities on intangible assets (213)      
Total 5,600      
Goodwill 131,012 $ 1,738 ₨ 116,980 ₨ 117,584
Total purchase price 10,433      
Material acquisitions [member]        
Disclosure of detailed information about business combination [line items]        
Net assets       5
Customer related intangibles       5,565
Other intangible assets       169
Total       5,739
Goodwill 4,833     1,185
Total purchase price ₨ 10,433     ₨ 6,924