v3.26.1
Earnings Per Equity Share - Additional Information (Detail)
12 Months Ended
Jul. 19, 2025
₨ / shares
shares
Mar. 31, 2026
₨ / shares
shares
Mar. 31, 2026
$ / shares
shares
Mar. 31, 2025
₨ / shares
shares
Mar. 31, 2024
₨ / shares
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Stock dividends issued per share disclosure | shares 7,677,039,761        
Per Share Value of Bonus Equity Share ₨ 1        
Required transfer of after tax Indian GAAP profit to a non-distributable statutory reserve in order to pay dividends without prior RBI approval   25.00% 25.00%    
Dividends declared       ₨ 11 ₨ 9.75
Common Stock, Dividends, Per Share, Declared | (per share)   ₨ 15.5 $ 0.17 ₨ 11 ₨ 9.75
Special Interim Dividend Pre Bonus [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common Stock, Dividends, Per Share, Declared   ₨ 2.5      
Employee Stock Option          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Potential equity shares excluded from the calculation of diluted earnings per share, average outstanding balance | shares   112,768,277 112,768,277 76,454,198 105,842,228
Indian GAAP [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Dividend payout, description of restrictions   As per the RBI guidelines, the dividend payout cannot exceed 35% of net income as calculated under Indian GAAP. As per the RBI guidelines, the dividend payout cannot exceed 35% of net income as calculated under Indian GAAP.    
Indian GAAP [Member] | Maximum          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Dividend payout, maximum pay out as a percentage of net income calculated under Indian GAAP   35.00% 35.00%