Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 1,622,642	$ 1,404,033	$ 1,310,254
Cost of Goods Sold	1,214,287	1,061,367	962,152
Gross Profit	408,355	342,666	348,102
Equity in Earnings of Unconsolidated Joint Venture	37,441	42,585	38,565
Corporate General and Administrative Expense	(49,511)	(65,410)	(37,371)
Gain on Sale of Businesses	51,973
Impairment Losses		(25,131)	(37,179)
Litigation Settlements and Losses			(1,800)
Other Non-Operating Income (Loss)	20,274	(594)	1,835
Interest Expense, net	(44,420)	(38,421)	(28,374)
Earnings from Continuing Operations Before Income Taxes	424,112	255,695	283,778
Income Taxes	(89,946)	(24,504)	(60,272)
Earnings from Continuing Operations	334,166	231,191	223,506
Earnings (Loss) from Discontinued Operations, net of Income Taxes	5,278	(160,297)	(154,646)
Net Earnings	$ 339,444	$ 70,894	$ 68,860
BASIC EARNINGS (LOSS) PER SHARE
Continuing Operations	$ 8.04	$ 5.50	$ 4.79
Discontinued Operations	0.13	(3.81)	(3.32)
Net Earnings	8.17	1.69	1.48
DILUTED EARNINGS (LOSS) PER SHARE
Continuing Operations	7.99	5.47	4.76
Discontinued Operations	0.13	(3.79)	(3.30)
Net Earnings	$ 8.12	$ 1.68	$ 1.47
AVERAGE SHARES OUTSTANDING
Basic	41,543,067	42,021,892	46,620,894
Diluted	41,826,709	42,285,343	46,932,380
CASH DIVIDENDS PER SHARE	$ 0.10	$ 0.40	$ 0.40