v3.26.1
Stock - Activity in the RSU's outstanding under the various Employees' Stock Incentive Master Scheme (Detail) - Restricted Stock Units (RSUs) [Member] - ₨ / shares
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Schedule of Restricted Stock Shares Activity [Line Items]      
Weighted average fair value of RSUs granted during the year ₨ 1 ₨ 1  
Employee Stock Incentive Master Scheme Two Thousand And Twenty Two [Member]      
Schedule of Restricted Stock Shares Activity [Line Items]      
RSUs outstanding, beginning of period 29,770,856 23,443,608 5,782,000
Granted 12,103,168 12,509,150 18,708,448
Exercised (8,382,710) (4,711,930) (633,240)
Forfeited (1,417,772) (1,367,662) (407,000)
Lapsed (353,842) (102,310) (6,600)
RSUs outstanding, end of period 31,719,700 29,770,856 23,443,608
RSUs exercisable, end of period 2,886,168 2,414,396 752,140
RSUs outstanding, beginning of period ₨ 1 ₨ 1 ₨ 1
Granted 1 1 1
Exercised 1 1 1
Forfeited 1 1 1
Lapsed 1 1 1
RSUs outstanding, end of period 1 1 1
RSUs exercisable, end of period 1 1 1
Weighted average fair value of RSUs granted during the year ₨ 952.26 ₨ 862.34 ₨ 782.72