Business Segments - Summarized Financial Information for Joint Venture Unconsolidated (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Related Party Transaction [Line Items]
Revenue	$ 2,260,508	$ 2,259,297	$ 2,148,069
Gross Margin	673,137	685,321	639,266
Earnings Before Income Taxes	591,485	617,937	588,593
Current Assets	668,657	627,693
Current Liabilities	245,004	239,409
Joint Venture [Member]
Related Party Transaction [Line Items]
Revenue	110,943	112,736	$ 113,518
Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Related Party Transaction [Line Items]
Revenue	221,937	225,503
Gross Margin	60,789	71,077
Earnings Before Income Taxes	53,217	63,644
Current Assets	128,384	111,164
Noncurrent Assets	207,910	158,618
Current Liabilities	25,618	27,994
Noncurrent Liabilities	$ 30,152	$ 14,974