v3.25.2
Segment information - Additional Information (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2025
INR (₨)
Customer
Mar. 31, 2025
USD ($)
Customer
Mar. 31, 2024
INR (₨)
Customer
Mar. 31, 2023
INR (₨)
Customer
Disclosure of operating segments [line items]        
Revenue ₨ 97,063 $ 1,136 ₨ 81,319 ₨ 78,223
Percentage of entity revenue 10.00% 10.00%    
Number of major customers more than ten percentage of revenue | Customer 1 1 1 5
One Major Customer [Member]        
Disclosure of operating segments [line items]        
Revenue ₨ 18,108   ₨ 23,343  
One Major Customer [Member] | Wind Power [Member]        
Disclosure of operating segments [line items]        
Revenue 9,231     ₨ 15,983
One Major Customer [Member] | Solar Power [Member]        
Disclosure of operating segments [line items]        
Revenue ₨ 8,877   ₨ 7,360  
Five Major Customers [Member]        
Disclosure of operating segments [line items]        
Revenue       11,747
Five Major Customers [Member] | Wind Power [Member]        
Disclosure of operating segments [line items]        
Revenue       5,138
Five Major Customers [Member] | Solar Power [Member]        
Disclosure of operating segments [line items]        
Revenue       ₨ 6,609