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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, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Nov. 23, 2016
INR (₨)
Nov. 23, 2016
USD ($)
Disclosure of detailed information about business combination [line items]            
Goodwill ₨ 116,980 $ 1,691.0 ₨ 117,584 ₨ 125,796    
Appirio Inc [member]            
Disclosure of detailed information about business combination [line items]            
Net assets         ₨ 497  
Technology platform         347  
Customer related intangibles         2,323  
Brand         3,148  
Alliance relationship         858  
Deferred tax liabilities on intangible assets         (2,791)  
Total         4,382  
Goodwill         28,020  
Total purchase price         32,402 $ 475.7
Appirio Inc [member] | Pre acquisition carrying [member]            
Disclosure of detailed information about business combination [line items]            
Net assets         526  
Technology platform         436  
Brand         180  
Total         1,142  
Appirio Inc [member] | Fair value adjustments [member]            
Disclosure of detailed information about business combination [line items]            
Net assets         (29)  
Technology platform         (89)  
Customer related intangibles         2,323  
Brand         2,968  
Alliance relationship         858  
Deferred tax liabilities on intangible assets         (2,791)  
Total         ₨ 3,240  
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     1,185      
Total purchase price     ₨ 6,924