v3.25.2
Stock - Estimated Fair Value of Restricted Stock Units on Dates of Each Grant Using Binomial Option Pricing Model (Detail) - Restricted Stock Units (RSUs) [Member] - Employee Stock Incentive Master Scheme Two Thousand And Twenty Two [Member]
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Share Based Compensation By Share Based Award Restricted Stock Units Valuation Assumptions [Line Items]      
Expected volatility, lower range 20.32% 21.32% 23.68%
Expected volatility, upper range 27.55% 35.35% 35.35%
Risk-free interest rate, lower range 6.84% 6.85% 7.07%
Risk-free interest rate, upper range 6.89% 7.18% 7.57%
Maximum [Member]      
Share Based Compensation By Share Based Award Restricted Stock Units Valuation Assumptions [Line Items]      
Dividend yield 1.20% 1.17% 0.75%
Expected term (in years) 4 years 4 years 4 years
Minimum [Member]      
Share Based Compensation By Share Based Award Restricted Stock Units Valuation Assumptions [Line Items]      
Dividend yield 0.77% 0.65% 0.47%
Expected term (in years) 1 year 1 year 1 year