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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Related Party Transaction [Line Items]
Revenue	$ 212,818	$ 216,533
Gross Margin	83,270	91,647
Earnings Before Income Taxes	77,131	86,838
Current Assets	71,688	71,089
Non-Current Assets	88,834	66,856
Current Liabilities	$ 19,309	$ 20,671

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