v3.26.1
Revenue - Summary of Revenue (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue ₨ 132,196 $ 1,409 ₨ 97,063 ₨ 81,319
Sale of Power [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 88,196 940 81,606 76,624
Sale of Solar Modules and Related Products [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 40,846 435 13,194 0
Transmission Line Projects [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 1,136 12 1,913 4,347
Sale of software services [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 1,667 18 0 0
Others [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue ₨ 351 $ 4 ₨ 350 ₨ 348