v3.26.1
Financial risk management (Details Textual)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Mar. 31, 2026
USD ($)
Financial Risk Management [Line Items]        
Uncommitted lines of credit ₨ 49,109 ₨ 50,904    
Working capital 134,409 119,720    
Financial Asset Available for Sale 35,912 33,186    
Cash and cash equivalents 15,368 14,654   $ 164
Increase In Hedging Reserve Sensitivity Analysis 4,059 6,053 ₨ 7,041  
Decrease In Hedging Reserve Sensitivity Analysis 3,688 6,184 7,269  
Increase In Profit From Contracts Sensitivity analysis 7,294 5,927 2,203  
Decrease In Profit From Contracts Sensitivity Analysis 7,192 5,927 ₨ 2,315  
Borrowings ₨ 18,206 8,721    
Percentage Of Depreciation Or Appreciation In Exchange Rate Used For Sensitivity Analysis 10.00%      
Expected increase or decrease in the net profit from fluctuation in Exchange Rate by 10% ₨ 3,163 3,742    
Percentage Of Increase Or Decrease In Floating Interest Rate Used For Sensitivity Analysis 10.00%      
Expected increase or decrease in the net profit from floating interest rate fluctuation by 10% ₨ 347 271    
Percentage decrease increase in exchange rates of each of the currencies underlying derivative contracts used for sensitivity analysis 10.00%      
Investments other than investments accounted for using equity method ₨ 83,141 53,645    
Term Deposits with Banks and Bonds [Member]        
Financial Risk Management [Line Items]        
Investments other than investments accounted for using equity method 36,534 9,948    
Cash flow hedges [member]        
Financial Risk Management [Line Items]        
Borrowings 0 0    
Floating interest rate [member] | Loan one [Member]        
Financial Risk Management [Line Items]        
Borrowings ₨ 41,500 ₨ 22,000    
Borrowings, interest rate basis T-bill + 35bps to 55 bps T-bill + 35 bps to 70 bps    
Floating interest rate [member] | Loan two [Member]        
Financial Risk Management [Line Items]        
Borrowings   ₨ 3,800    
Borrowings, interest rate basis   3 Month T-bill + 84 bps    
Floating interest rate [member] | Loan three [Member]        
Financial Risk Management [Line Items]        
Borrowings ₨ 12,690 ₨ 10,856    
Borrowings, interest rate basis REPO rate + 75bps 6 Months SOFR + 10 bps to 65 bps    
Floating interest rate [member] | Loan Four [Member]        
Financial Risk Management [Line Items]        
Borrowings ₨ 3,799 ₨ 1,274    
Borrowings, interest rate basis 3 Months T-bill + 84 bps Key rate + 4.7% to 5.9    
Floating interest rate [member] | Loan Five [Member]        
Financial Risk Management [Line Items]        
Borrowings ₨ 1,423 ₨ 2,217    
Borrowings, interest rate basis Key rate + 3.48% to 3.98% TIIE + 1.35%    
Floating interest rate [member] | Loan Six [Member]        
Financial Risk Management [Line Items]        
Borrowings ₨ 2,795 ₨ 595    
Borrowings, interest rate basis TIIE + 1.35% CDI + 1.55%    
Floating interest rate [member] | Loan Seven [Member]        
Financial Risk Management [Line Items]        
Borrowings ₨ 727      
Borrowings, interest rate basis CDI + 1.55%      
Unutilized credit limits [Member]        
Financial Risk Management [Line Items]        
Uncommitted lines of credit ₨ 49,109 ₨ 50,904