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Discontinued Operations and Other Dispositions - Summary of Revenue and Operating Earnings (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Revenue $ 404,667 $ 342,904 $ 1,279,340 $ 1,098,838
Operating Earnings $ 123,462 103,903 366,981 312,806
Mathews Readymix LLC and Western Aggregates LLC [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Revenue   7,872 1,692 25,248
Operating Earnings   $ 1,167 $ 142 $ 3,680