v3.25.2
Interest-bearing loans and borrowings - long term - Summary of Compulsorily Convertible Debentures (Unsecured) Terms of Conversion of CCDs (Detail) - Unsecured Compulsorily Convertible Debentures [Member]
₨ in Millions
 12 Months Ended
Mar. 31, 2025
INR (₨)
shares
Disclosure Of Detailed Information About Unsecured Compulsorily Convertible Debentures [Line Items]  
Total proceeds | ₨ ₨ 16,296
Number Of Debentures | shares 877,151,757
IB Vogt Solar Seven Private Limited  
Disclosure Of Detailed Information About Unsecured Compulsorily Convertible Debentures [Line Items]  
Tenure (years) 40 years
Total proceeds | ₨ ₨ 23
Maturity date August 18, 2060 and June 17, 2061
Interest coupon rate 10.00%
Number Of Debentures | shares 2,299,544
Moratorium period 24 months
Renew Surya Roshani Private Limited  
Disclosure Of Detailed Information About Unsecured Compulsorily Convertible Debentures [Line Items]  
Tenure (years) 26 years
Total proceeds | ₨ ₨ 15,308
Maturity date August 5, 2048
Interest coupon rate 13.00%
Number Of Debentures | shares 866,076,759
ReNew Solar Energy (Jharkhand Three) Private Limited  
Disclosure Of Detailed Information About Unsecured Compulsorily Convertible Debentures [Line Items]  
Tenure (years) 6 years
Total proceeds | ₨ ₨ 965
Maturity date March 31, 2027
Interest coupon rate 8.00%
Number Of Debentures | shares 8,775,454
Terms One equity share will be issued for each CCD on the maturity date (1:1)