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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Related Party Transaction [Line Items]
Revenues	$ 215,569	$ 214,916
Gross Margin	90,098	84,380
Earnings Before Income Taxes	84,772	78,166
Current Assets	73,767	70,491
Non-Current Assets	42,337	41,464
Current Liabilities	$ 22,293	$ 15,964

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