v3.26.1
Business combination - Schedule of Purchase Consideration of Cash Flows (Detail) - 3E NV - INR (₨)
₨ in Millions
12 Months Ended
Jun. 30, 2025
Mar. 31, 2026
Mar. 31, 2025
Jul. 01, 2025
Disclosure of detailed information about business combination [line items]        
Cash consideration paid ₨ 3,915 ₨ 0 ₨ 3,915  
Less: cash balances acquired   (107)    
Cash acquired on acquisition of control in jointly controlled entities   ₨ 107   ₨ 107