Equity Awards - Weighted-Average Assumptions Used to Value Option Awards (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fiscal 2025 Employee Performance Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Measurement Period / Expected Life	2 years 10 months 6 days
Risk-Free Interest Rate	4.70%
Dividend Yield	0.40%
Expected Volatility	31.40%
Estimated Fair Value of Market-Based PSA at Grant Date	$ 238.27
Fiscal 2025 Board of Directors Stock Option Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Measurement Period / Expected Life	6 years	6 years
Risk-Free Interest Rate	4.35%	3.74%
Dividend Yield	0.50%	0.80%
Expected Volatility	38.80%	38.80%