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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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