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Segment Information - Summarized Financial Information for Joint Venture Unconsolidated (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2024
Related Party Transaction [Line Items]          
Revenue $ 623,619 $ 622,236 $ 1,232,308 $ 1,223,757  
Gross Margin 203,844 209,018 390,712 385,013  
Earnings Before Income Taxes 185,251 194,189 356,185 349,638  
Current Assets 730,449   730,449   $ 627,693
Current Liabilities 312,227   312,227   239,409
Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]          
Related Party Transaction [Line Items]          
Revenue 57,650 57,813 116,270 112,060  
Gross Margin 20,370 23,509 36,794 32,047  
Earnings Before Income Taxes 18,437 $ 20,690 33,985 $ 27,009  
Current Assets 124,109   124,109   111,164
Noncurrent Assets 184,289   184,289   158,618
Current Liabilities $ 42,864   $ 42,864   $ 27,994