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Significant Accounting Policies - Additional Information (Detail)
₨ / shares in Units, $ in Millions
12 Months Ended
Apr. 01, 2018
INR (₨)
Mar. 31, 2019
INR (₨)
Vote
₨ / shares
shares
Mar. 31, 2018
INR (₨)
Vote
₨ / shares
shares
Mar. 31, 2019
USD ($)
shares
Mar. 08, 2019
₨ / shares
Mar. 31, 2017
INR (₨)
₨ / shares
shares
Disclosure of classes of share capital [line items]            
Authorized share capital   ₨ 25,274,000,000        
Par value per share | ₨ / shares     ₨ 2   ₨ 2 ₨ 2
Number of vote | Vote   1 1      
Undistributed earnings after taxes not freely available for distribution   ₨ 1,139,000,000 ₨ 1,139,000,000     ₨ 1,139,000,000
Capital redemption reserve   0 767,000,000     80,000,000
Unbilled receivables   22,880,000,000 42,486,000,000 $ 331    
Unearned revenue   14,570,000,000        
Unbilled revenue recognized On contract assets ₨ 17,469,000,000 13,558,000,000        
Transaction price allocated to remaining performance obligations   ₨ 373,879,000,000        
Percentage of transaction price allocated to remaining performance obligation as revenues   59.00%        
Explanation of when entity expects to recognise transaction price allocated to remaining performance obligations as revenue   approximately 59% is expected to be recognized as revenues within two years, and the remainder thereafter.        
Lease liabilities   ₨ 15,867,000,000        
Right of use asset   13,266,000,000        
Increase (decrease) due to application of IFRS 15 [member]            
Disclosure of classes of share capital [line items]            
Expected reduction in opening retained earnings on adoption of IFRS 15   (2,279,000,000)        
Non financial contract assets   15,038,000,000        
Unbilled receivables   22,880,000,000        
Special economic zone re-investment reserve [member]            
Disclosure of classes of share capital [line items]            
Undistributed earnings after taxes not freely available for distribution   ₨ 28,565,000,000 ₨ 0     ₨ 0
Bottom of range [member]            
Disclosure of classes of share capital [line items]            
Perentage of voting power of another entity   20.00%        
Top of range [member]            
Disclosure of classes of share capital [line items]            
Perentage of voting power of another entity   50.00%        
Treasury shares [member]            
Disclosure of classes of share capital [line items]            
Treasury shares held | shares   27,353,853 23,097,216 27,353,853   13,728,607
Ordinary Shares [member]            
Disclosure of classes of share capital [line items]            
Authorized shares | shares   12,504,500,000   12,504,500,000    
Par value per share | ₨ / shares   ₨ 2        
Preference Shares [member]            
Disclosure of classes of share capital [line items]            
Authorized shares | shares   25,000,000   25,000,000    
10% Optionally Convertible Cumulative Preference Shares [member]            
Disclosure of classes of share capital [line items]            
Authorized shares | shares   150,000   150,000    
Par value per share | ₨ / shares   ₨ 100