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Expenses by Nature - Summary of Expenses by Nature (Parenthetical) (Detail) - Provision for impairment of receivables and deferred contract cost [member]
₨ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Disclosure Of Expense [Line Items]  
Provision for impairment of receivables and deferred contract cost ₨ 4,612
Cost Of Revenue [member]  
Disclosure Of Expense [Line Items]  
Provision for impairment of receivables and deferred contract cost 416
General and administrative expenses [member]  
Disclosure Of Expense [Line Items]  
Provision for impairment of receivables and deferred contract cost ₨ 4,196