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Segment Information - Additional Information (Detail)
₨ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Segment
Mar. 31, 2017
INR (₨)
Client
Mar. 31, 2016
Client
Mar. 31, 2015
Client
Disclosure of operating segments [line items]        
Number of geographic segments | Segment 4      
No client individually accounted for more than 10% of revenues | Client   0 0 0
Provision for impairment of receivables [member]        
Disclosure of operating segments [line items]        
Provision for impairment of receivables and deferred contract cost ₨ 3,175      
Provision for deferred contract cost [member]        
Disclosure of operating segments [line items]        
Provision for impairment of receivables and deferred contract cost ₨ 1,437      
Information Technology Services [member]        
Disclosure of operating segments [line items]        
Gain from sale of EcoEnergy division   ₨ 4,082