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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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