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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Revenue	$ 216,533	$ 215,569
Gross Margin	91,647	90,098
Earnings Before Income Taxes	86,838	84,772
Current Assets	71,089	73,767
Non-Current Assets	66,856	42,337
Current Liabilities	$ 20,671	$ 22,293

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