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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Related Party Transaction [Line Items]          
Revenue $ 59,775 $ 51,859 $ 115,617 $ 107,510  
Gross Margin 26,191 21,877 46,056 42,018  
Earnings Before Income Taxes 24,713 $ 20,345 43,577 $ 38,849  
Current Assets 80,794   80,794   $ 71,688
Non-Current Assets 86,523   86,523   81,007
Current Liabilities $ 18,863   $ 18,863   $ 19,309