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Expenses by Nature - Summary of Expenses by Nature (Parenthetical) (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Disclosure Of Expense [line items]        
Impairment on certain software platform and intangible assets recognized on acquisitions ₨ 0 ₨ 2,318   ₨ 643
Miscellaneous expenses ₨ 5,344 11,736   4,705
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