v3.26.1
Share-Based Employee Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value $ 175.8 $ 148.4 $ 177.7
Tax benefit arising on exercise of stock award $ 16.6 $ 25.3 $ 16.0
Share-Based Payment Arrangement [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period 4 years    
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value $ 12.83 $ 10.84 $ 8.3
Share-based compensation arrangement by share-based payment award, per share weighted average price of shares purchased $ 13.47 $ 11 $ 9
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value $ 175.8 $ 148.4 $ 177.7