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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Related Party Transaction [Line Items]          
Revenue $ 447,684 $ 400,569 $ 874,673 $ 755,934  
Gross Margin 122,849 109,020 225,146 187,114  
Earnings from Continuing Operations Before Income Taxes 109,671 98,367 239,598 155,931  
Current Assets 648,407   648,407   $ 678,217
Current Liabilities 163,085   163,085   169,697
Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]          
Related Party Transaction [Line Items]          
Revenue 54,387 59,775 104,987 115,617  
Gross Margin 23,004 26,191 39,769 46,056  
Earnings from Continuing Operations Before Income Taxes 21,154 $ 24,713 36,745 $ 43,577  
Current Assets 70,185   70,185   77,331
Non-Current Assets 101,889   101,889   93,093
Current Liabilities $ 16,917   $ 16,917   $ 17,197