Consolidated Statements of Earnings (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenues	$ 284,808	$ 252,646	$ 551,059	$ 479,690
Cost of Goods Sold	209,747	193,167	419,597	373,607
Gross Profit	75,061	59,479	131,462	106,083
Equity in Earnings of Unconsolidated Joint Venture	12,051	9,747	21,851	17,625
Corporate General and Administrative	(7,414)	(6,060)	(14,456)	(11,654)
Acquisition and Litigation Expense	(2,103)		(2,103)
Other Income	883	317	1,562	900
Interest Expense, Net	(3,901)	(4,795)	(7,953)	(9,750)
Earnings Before Income Taxes	74,577	58,688	130,363	103,204
Income Tax Expense	(24,258)	(18,785)	(42,334)	(33,200)
Net Earnings	$ 50,319	$ 39,903	$ 88,029	$ 70,004
EARNINGS PER SHARE:
Basic	$ 1.01	$ 0.81	$ 1.78	$ 1.43
Diluted	$ 1.00	$ 0.80	$ 1.75	$ 1.40
AVERAGE SHARES OUTSTANDING:
Basic	49,591,495	49,012,045	49,546,916	48,984,038
Diluted	50,427,286	49,860,100	50,357,914	49,835,382
CASH DIVIDENDS PER SHARE:	$ 0.10	$ 0.10	$ 0.20	$ 0.20