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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Related Party Transaction [Line Items]          
Revenue $ 56,767 $ 51,411 $ 172,385 $ 158,922  
Gross Margin 22,749 20,178 68,806 62,196  
Earnings Before Income Taxes 21,402 $ 19,013 64,979 $ 57,862  
Current Assets 80,108   80,108   $ 71,688
Non-Current Assets 88,242   88,242   81,007
Current Liabilities $ 19,190   $ 19,190   $ 19,309