v3.26.1
Investment in equity accounted investees (Details)
₨ in Millions, $ in Millions
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees ₨ 5,673 $ 60 ₨ 4,811  
Kunshan Rotam Reddy Pharmaceuticals Co Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees [1] 5,263   4,428 ₨ 4,130
DRES energy private limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 57   58 55
O2 Renewable Energy IX Private Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 339   308 11
Clean Renewable Energy KK2A Private Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 14   17 ₨ 0
Investment in unquoted equity shares [member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 5,501   4,639  
Investment in unquoted equity shares [member] | Kunshan Rotam Reddy Pharmaceuticals Co Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 5,263   4,428  
Investment in unquoted equity shares [member] | DRES energy private limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 57   58  
Investment in unquoted equity shares [member] | O2 Renewable Energy IX Private Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 167   136  
Investment in unquoted equity shares [member] | Clean Renewable Energy KK2A Private Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in equity accounted investees 14   17  
Investment in compulsory convertible debentures [member]        
Investments accounted for using equity method [Line Items]        
Investment in compulsory convertible debentures 172   172  
Investment in compulsory convertible debentures [member] | O2 Renewable Energy IX Private Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investment in compulsory convertible debentures ₨ 172   ₨ 172  
[1] Includes Rs.181 representing the goodwill on acquisition of investment.