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Investments - Summary of Financial Information in Respect of Investments Accounted for Using Equity Method (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Mar. 31, 2023
INR (₨)
Mar. 31, 2025
USD ($)
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 ₨ 933   ₨ 783    
Carrying amount of the Company's interest in joint venture accounted for using the equity method 394   261    
Total investments accounted for using equity method 1,327   1,044   $ 16
Share of net profit/ (loss) of associate accounted for using the equity method 129   (8) ₨ (57)  
Share of net profit/ (loss) of joint venture accounted for using the equity method 125   (225) 0  
Total share of profit (loss) of associates and joint ventures accounted for using equity method ₨ 254 $ 3 (233) ₨ (57)  
SDVerse LLC [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 joint venture accounted for using the equity method     ₨ 484    
Company's share of equity in the joint venture     27.00%