v3.26.1
Fair Value Measurement Hierarchy - Summary of Fair Value Measurement Hierarchy Of The Financial Assets And Liabilities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Liability for put options with non-controlling interests      
Financial Liabilities [Abstract]      
Carrying value ₨ 5,644   ₨ 6,358
Financial liabilities at fair value | Liability for put options with non-controlling interests | Level 2      
Financial Liabilities [Abstract]      
Carrying value 5,644 $ 60 6,371
Fair value 5,644 60 6,371
Financial liabilities at fair value | Derivative instruments - public share warrants | Level 1      
Financial Liabilities [Abstract]      
Carrying value 13 0 156
Fair value 13 0 156
Financial liabilities at fair value | Derivative instruments - private share warrants | Level 2      
Financial Liabilities [Abstract]      
Carrying value 1 0 34
Fair value 1 0 34
Financial liabilities designated as a hedge instrument at fair value | Derivative instruments - hedge instruments | Level 2      
Financial Liabilities [Abstract]      
Carrying value 103 1 857
Fair value 103 1 857
Financial liabilities designated as fair value through profit or loss | Liability for put options | Level 3      
Financial Liabilities [Abstract]      
Carrying value 9,047 96  
Fair value 9,047 96  
Financial assets at fair value | Investments | Level 2      
Financial Assets [Abstract]      
Carrying value 8,685 93 1,342
Fair value 8,685 93 1,342
Financial assets designated as a hedge instrument at fair value | Derivative instruments | Level 2      
Financial Assets [Abstract]      
Carrying value 15,575 166 7,398
Fair value ₨ 15,575 $ 166 ₨ 7,398