v3.26.1
Related party disclosure - Additional Information (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
USD ($)
shares
Mar. 31, 2025
INR (₨)
shares
Mar. 31, 2024
shares
Mar. 31, 2026
INR (₨)
Disclosure of transactions between related parties [line items]        
Weighted average number of days trading price 30 days      
Conversion ratio as per terms of option conversion ratio of 1:0.8289      
Maximum cash purchase per annum required for shares | $ $ 12      
Liability for put options with non-controlling interests        
Disclosure of transactions between related parties [line items]        
Outstanding liability | ₨   ₨ 6,358   ₨ 5,644
Put option exercised during period | shares 0 0 2,116,955