v3.26.1
Financial Instruments - Information Related to Derivative Amounts Recognized in Income (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives gain/(loss), net ₨ 14,113.2 $ 150.4 ₨ 37,644.2 ₨ 18,558.5
Interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives gain/(loss), net (14,950.2) (159.3) 19,426.5 1,762.6
Forward rate agreements        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives gain/(loss), net (19,816.1) (211.2) 7,407.1 2,089.6
Currency options        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives gain/(loss), net (562.9) (6.0) 421.7 194.0
Currency swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives gain/(loss), net 28,175.6 300.2 9,511.0 10,242.9
Forward exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives gain/(loss), net ₨ 21,266.8 $ 226.7 ₨ 877.9 ₨ 4,269.4