v3.26.1
Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Shareholders Equity [Line Items]      
Common stock, par or stated value per share $ 0.000000001    
Stock repurchased during period, shares 35,913,201 8,704,883 9,071,706
Average price paid pershare to repurchase stock $ 13.11 $ 10.46 $ 9.55
Share repurchase costs $ 3.3 $ 0.6 $ 0.5
Other Comprehensive Income (Loss) [Member]      
Shareholders Equity [Line Items]      
OCI, debt securities, available-for-sale, unrealized holding gain (loss), before adjustment, tax 7.6 42.5 3.7
OCI, foreign currency transaction and translation gain (loss), arising during period, tax $ 7.3 $ 42.5 $ 3.4
Common Class A [Member]      
Shareholders Equity [Line Items]      
Ordinary shares 672,000 223,000 100,000
Common stock, par or stated value per share $ 0.01    
Common stock, voting rights Each Class A Ordinary shareholder is entitled to one vote for each Class A Ordinary Share held, subject to any restrictions on total voting rights as set out in the Company’s Articles of Association.    
Common Class B [Member]      
Shareholders Equity [Line Items]      
Common stock, par or stated value per share $ 0.000000001    
Common stock, voting rights Each Class B shareholder is entitled to nine votes for each Class B Share held, subject to any restrictions on total voting rights as set out in the Company’s Articles of Association.    
Stock redeemed or called during period, shares 34,700,987 155,305,559 0