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Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 1,211,220	$ 1,143,492	$ 1,066,368
Cost of Goods Sold	899,175	911,875	812,235
Gross Profit	312,045	231,617	254,133
Equity in Earnings of Unconsolidated Joint Venture	42,386	39,083	44,967
Corporate General and Administrative Expense	(33,940)	(37,193)	(30,751)
Other Operating Income	2,139	2,328	3,201
Acquisition and Litigation Expense	(5,480)		(6,880)
Interest Expense, Net	(22,631)	(16,583)	(11,743)
Earnings before Income Taxes	294,519	219,252	252,927
Income Taxes	(96,300)	(66,660)	(66,074)
Net Earnings	$ 198,219	$ 152,592	$ 186,853
EARNINGS PER SHARE
Basic	$ 4.14	$ 3.08	$ 3.77
Diluted	$ 4.10	$ 3.05	$ 3.71
AVERAGE SHARES OUTSTANDING
Basic	47,931,518	49,471,157	49,604,249
Diluted	48,361,286	50,070,829	50,372,243
CASH DIVIDENDS PER SHARE	$ 0.40	$ 0.40	$ 0.40

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