v3.26.1
Investments - Summary of Financial Information in Respect of Investments Accounted for Using Equity Method (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Mar. 31, 2026
USD ($)
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]          
Carrying amount of the Company's interest in associates accounted for using the equity method a ₨ 1,716   ₨ 933    
Carrying amount of the Company's interest in joint venture accounted for using the equity method 410   394    
Investments in associates accounted for using equity method 1,716   933    
Total investments accounted for using equity method 2,126   1,327   $ 23
Share of net profit/ (loss) of associate accounted for using the equity method 282   129 ₨ (8)  
Share of net profit/ (loss) of joint venture accounted for using the equity method (25)   125 (225)  
Total share of profit (loss) of associates and joint ventures accounted for using equity method 257 $ 3 ₨ 254 ₨ (233)  
Drivestream Inc [member]          
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]          
Carrying amount of the Company's interest in associates accounted for using the equity method a 352        
Investments in associates accounted for using equity method ₨ 352        
Proportion of ownership interest in associate 43.70% 43.70%