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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Related Party Transaction [Line Items]
Revenue	$ 404,667	$ 342,904	$ 1,279,340	$ 1,098,838
Gross Margin	113,379	93,203	338,525	280,317
Earnings from Continuing Operations Before Income Taxes	105,072	56,157	344,670	212,088
Current Assets	528,558		528,558		$ 678,217
Current Liabilities	163,061		163,061		169,697
Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Related Party Transaction [Line Items]
Revenue	54,220	56,767	159,207	172,385
Gross Margin	22,045	22,749	61,814	68,806
Earnings from Continuing Operations Before Income Taxes	$ 21,920	21,402	$ 58,665	64,979
Current Assets		68,449		68,449	77,331
Non-Current Assets		107,211		107,211	93,093
Current Liabilities		$ 16,883		$ 16,883	$ 17,197

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