v3.26.1
Employee Stock Incentive Plans - Summary of options under RSU and ADS granted by the company (Detail) - shares
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Restricted stock units option plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number based stock options granted [1] 10,617,130 5,513,469 5,237,166
Restricted Stock Units (RSU) [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number based stock options granted [1] 6,743,031 3,498,476 3,344,668
Performance based restricted stock units [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number based stock options granted [1] 3,874,099 2,014,993 1,892,498
ADS RSU [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number based stock options granted [1] 14,834,924 9,707,235 8,886,979
Performance based ADS [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number based stock options granted [1] 8,424,826 5,323,067 5,659,164
American depositary shares option plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number based stock options granted [1] 23,259,750 15,030,302 14,546,143
[1] Numbers in above table for years ended March 31, 2024 and 2025 are not given effect of bonus shares issued during the year ended March 31, 2025.