v3.25.2
Revenue - Summary of Revenue (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Mar. 31, 2023
INR (₨)
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue ₨ 97,063 $ 1,136 ₨ 81,319 ₨ 78,223
Power [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 81,606 955 76,624 70,530
Transmission Line Projects [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 1,913 22 4,347 7,557
Sale of goods [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 13,194 154 0 0
Others [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue ₨ 350 $ 4 ₨ 348 ₨ 136