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Expenses by Nature - Summary of Expenses by Nature (Parenthetical) (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Disclosure Of Expense [line items]        
Impairment on certain software platform and intangible assets recognized on acquisitions ₨ 2,318   ₨ 643 ₨ 3,056
Miscellaneous expenses 11,736   4,705 ₨ 5,836
National Grid on settlement of legal claim [member]        
Disclosure Of Expense [line items]        
Miscellaneous expenses ₨ 5,141 $ 75    
Provision for impairment of receivables and deferred contract cost [member]        
Disclosure Of Expense [line items]        
Provision for impairment of receivables and deferred contract cost     4,612  
Provision for impairment of receivables and deferred contract cost [member] | Cost Of Revenue [member]        
Disclosure Of Expense [line items]        
Provision for impairment of receivables and deferred contract cost     416  
Provision for impairment of receivables and deferred contract cost [member] | General and administrative expenses [member]        
Disclosure Of Expense [line items]        
Provision for impairment of receivables and deferred contract cost     ₨ 4,196