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Discontinued Operations and Other Dispositions - Summary of Revenue and Operating Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Revenue	$ 447,684	$ 400,569	$ 874,673	$ 755,934
Operating Earnings	$ 133,426	121,377	243,519	208,903
Mathews Readymix LLC and Western Aggregates LLC [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Revenue		9,575	1,692	17,376
Operating Earnings		$ 1,530	$ 142	$ 2,513

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