v3.26.1
Joint arrangements and associates - Additional Information (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Apr. 07, 2026
Mar. 31, 2026
USD ($)
Mar. 31, 2026
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2025
INR (₨)
Aug. 05, 2022
USD ($)
Aug. 05, 2022
INR (₨)
Disclosure of joint operations [line items]                    
Goodwill | $         $ 16,749   $ 11,596      
RPPL                    
Disclosure of joint operations [line items]                    
Committed funding amount                 $ 5 ₨ 412
3E NV                    
Disclosure of joint operations [line items]                    
Carrying value of investment including goodwill               ₨ 3,869    
Goodwill               3,518    
Post acquisition share of profits (losses) ₨ 370                  
Fluence Energy Singapore Pte. Ltd                    
Disclosure of joint operations [line items]                    
Carrying value of investment including goodwill           ₨ 374   ₨ 380    
Post acquisition share of profits (losses) ₨ 6 ₨ 27 ₨ 0              
Committed funding amount                 $ 10 ₨ 824
Climate Connect Digital Limited                    
Disclosure of joint operations [line items]                    
Proportion of ownership interest in associate 25.00%                  
Fluence India ReNew JV Private Limited                    
Disclosure of joint operations [line items]                    
Proportion of ownership interest in joint operation 50.00% 50.00%                
Percentage of ownership interest upon completion of the transaction 100.00%                  
Fluence India ReNew JV Private Limited | Fluence Energy Singapore Pte. Ltd                    
Disclosure of joint operations [line items]                    
Percentage of equity interest to be acquired       50.00%            
VG DTL Transmissions Private Limited                    
Disclosure of joint operations [line items]                    
Proportion of ownership interest in joint operation 50.00%