Discontinued Operations and Other Dispositions - Summary of Revenue and Operating Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Revenue	$ 413,117	$ 462,941	$ 509,694	$ 475,770	$ 343,302	$ 404,667	$ 447,684	$ 426,989	$ 1,861,522	$ 1,622,642	$ 1,404,033
Operating Earnings (Loss)									$ 552,102	445,796	385,251
Mathews Readymix LLC and Western Aggregates LLC [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Revenue										1,692	32,255
Operating Earnings (Loss)										$ 142	$ 4,837