v3.26.1
Share based payment - Additional Information (Detail)
12 Months Ended
Aug. 23, 2021
shares
Mar. 31, 2026
shares
$ / shares
Mar. 31, 2025
shares
$ / shares
Mar. 31, 2024
shares
Aug. 29, 2025
shares
Aug. 05, 2025
$ / shares
Share Based Payment Arrangements [Line Items]            
Replacement of group stock option plans, exchange ratio 0.8289          
Holding Company Stock Option Plans            
Share Based Payment Arrangements [Line Items]            
Weighted average exercise price of options outstanding | $ / shares   $ 3.72 $ 4.2      
Weighted average exercise price of options granted during the year | $ / shares   $ 3.72 $ 4.2      
Number of options exercised during the year   1,132,704 17,254      
Weighted average exercise price of share replacement of group stock option plans | $ / shares   $ 3.72 $ 4.2      
Weighted average exercise price of options exercised during the year | $ / shares   $ 4.38 $ 4.13      
Weighted average remaining contractual life of options outstanding   1 year 2 months 15 days 2 years 21 days      
Number of share options vested in share based payment arrangement 5,747,481 6,933,865        
Number of unvested option, shares 5,923,543 7,146,270        
2021 Incentive Award Plan            
Share Based Payment Arrangements [Line Items]            
Weighted average exercise price of options outstanding | $ / shares   $ 8.49 $ 8.56      
Weighted average exercise price of options granted during the year | $ / shares   $ 7.4 $ 7.15      
Number of options exercised during the year   500,842 121,299      
Weighted average exercise price of exercisable options during the year | $ / shares   $ 9.23 $ 9.47      
Weighted average remaining contractual life of options outstanding   6 years 5 months 26 days 7 years 3 months 7 days      
Number of options granted   5,000,000 7,000,000 16,000,000    
2025 Employee Stock Option Plan            
Share Based Payment Arrangements [Line Items]            
Number of share options vested in share based payment arrangement   0        
Number of options granted   6,000,000 0      
2025 Employee Stock Option Plan | Top of Range            
Share Based Payment Arrangements [Line Items]            
Number of shares authorised to grant in share based payment arrangement         7,911,300  
2025 Employee Stock Option Plan | Series B Optionally Convertible Redeemable Preference Shares            
Share Based Payment Arrangements [Line Items]            
Percentage of shares of subsidiary permitted to subscribe by eligible employees           0.0001%
Shares permitted to subscribe by eligible employees, subscription price per share | $ / shares           $ 100
2025 Employee Share Purchase Plan            
Share Based Payment Arrangements [Line Items]            
Number of options granted   9,000,000