v3.26.1
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, 2026
Mar. 31, 2025
Mar. 31, 2024
Share Based Compensation By Share Based Award Restricted Stock Units Valuation Assumptions [Line Items]      
Expected volatility, lower range 18.25% 20.32% 21.32%
Expected volatility, upper range 23.18% 27.55% 35.35%
Risk-free interest rate, lower range 5.86% 6.84% 6.85%
Risk-free interest rate, upper range 6.33% 6.89% 7.18%
Maximum [Member]      
Share Based Compensation By Share Based Award Restricted Stock Units Valuation Assumptions [Line Items]      
Dividend yield 1.35% 1.20% 1.17%
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 1.09% 0.77% 0.65%
Expected term (in years) 1 year 1 year 1 year