v3.26.1
Accounting for Transmission Line Projects Entered into by the Group - Additional Information (Detail)
₨ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2024
INR (₨)
Mar. 31, 2026
INR (₨)
Project
Mar. 31, 2026
USD ($)
Project
Mar. 31, 2024
INR (₨)
Mar. 31, 2023
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Disclosure of detailed information about service concession arrangements [line items]              
Trade receivables   ₨ 24,094   ₨ 21,856   $ 257 ₨ 24,268
Contract assets   ₨ 3,815   1,716   41 ₨ 2,832
3E NV [Member]              
Disclosure of detailed information about service concession arrangements [line items]              
Acquired contract assets | $     $ 140        
Contract assets | $           $ 206  
BOOM Model              
Disclosure of detailed information about service concession arrangements [line items]              
Change in regulations and Property, plant and equipment ₨ 10,583            
Transmission Services Agreements (TSA)              
Disclosure of detailed information about service concession arrangements [line items]              
Term of contract   35 years 35 years        
Asset's useful life   50 years 50 years        
Fixed annual levelized tariff period   35 years 35 years        
Transmission Services Agreements (TSA) | BOOM Model              
Disclosure of detailed information about service concession arrangements [line items]              
Trade receivables 95            
Number of projects | Project   2 2        
Construction, operating and maintenance revenues   ₨ 0   ₨ 0      
Change in regulations and Property, plant and equipment ₨ 10,583            
Recognition of construction revenue   9,987     ₨ 7,478    
Revenue recognised on contract assets   691     152    
Profit   ₨ 386     ₨ 289    
Transmission Services Agreements (TSA) | BOOT Model              
Disclosure of detailed information about service concession arrangements [line items]              
Term of contract   35 years 35 years