Consolidated Statements of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenues	$ 252,646	$ 164,659	$ 479,690	$ 318,701
Cost of Goods Sold	193,167	132,170	373,607	263,315
Gross Profit	59,479	32,489	106,083	55,386
Equity in Earnings of Unconsolidated Joint Venture	9,747	8,750	17,625	15,218
Corporate General and Administrative	(6,060)	(5,919)	(11,654)	(10,674)
Acquisition and Litigation Expense		(5,713)		(6,374)
Other Income	317	66	900	(204)
Interest Expense, Net	(4,795)	(3,548)	(9,750)	(7,313)
Earnings Before Income Taxes	58,688	26,125	103,204	46,039
Income Tax Expense	(18,785)	(8,172)	(33,200)	(14,108)
Net Earnings	$ 39,903	$ 17,953	$ 70,004	$ 31,931
EARNINGS PER SHARE:
Basic	$ 0.81	$ 0.40	$ 1.43	$ 0.71
Diluted	$ 0.80	$ 0.40	$ 1.40	$ 0.71
AVERAGE SHARES OUTSTANDING:
Basic	49,012,045	44,746,225	48,984,038	44,708,499
Diluted	49,860,100	45,353,778	49,835,382	45,219,224
CASH DIVIDENDS PER SHARE:	$ 0.10	$ 0.10	$ 0.20	$ 0.20