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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Related Party Transaction [Line Items]          
Revenue $ 509,694 $ 447,684 $ 985,464 $ 874,673  
Gross Margin 155,341 122,849 281,852 225,146  
Earnings Before Income Taxes 131,315 109,671 253,034 239,598  
Current Assets 472,111   472,111   $ 661,689
Current Liabilities 188,645   188,645   169,354
Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]          
Related Party Transaction [Line Items]          
Revenue 53,852 54,387 99,234 104,987  
Gross Margin 17,776 23,004 34,609 39,769  
Earnings Before Income Taxes 16,519 $ 21,154 32,459 $ 36,745  
Current Assets 68,028   68,028   66,871
Noncurrent Assets 110,571   110,571   107,617
Current Liabilities $ 17,586   $ 17,586   $ 16,390