Summarized Financial Information for Joint Venture Unconsolidated (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Related Party Transaction [Line Items]
Revenue	$ 622,236	$ 605,068	$ 1,223,757	$ 1,166,455
Gross Margin	209,018	194,239	385,013	345,105
Earnings Before Income Taxes	194,189	178,524	349,638	314,703
Current Assets	611,806		611,806		$ 521,503
Current Liabilities	224,535		224,535		212,889
Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Related Party Transaction [Line Items]
Revenue	57,813	50,259	112,060	102,889
Gross Margin	23,509	15,977	32,047	28,003
Earnings Before Income Taxes	20,690	$ 14,312	27,009	$ 24,508
Current Assets	102,831		102,831		88,562
Noncurrent Assets	134,254		134,254		124,503
Current Liabilities	$ 31,791		$ 31,791		$ 29,434