CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (USD $)	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Income Statement [Abstract]
Net Sales	$ 336,628,000	$ 317,593,000	$ 568,755,000	$ 548,644,000
Costs and Expenses:
Cost of Product Sold	314,249,000	276,688,000	526,696,000	478,664,000
Selling and Administrative	15,856,000	16,245,000	31,775,000	31,073,000
Plant Restructuring	347,000		501,000
Other Operating Income	(607,000)	(274,000)	(788,000)	(292,000)
Total Costs and Expenses	329,845,000	292,659,000	558,184,000	509,445,000
Operating Income (Loss)	6,783,000	24,934,000	10,571,000	39,199,000
Interest Expense, Net	1,548,000	1,836,000	3,375,000	3,314,000
Earnings (Loss) Before Income Taxes	5,235,000	23,098,000	7,196,000	35,885,000
Income Taxes Expense (Benefit)	(1,368,000)	8,577,000	(754,000)	13,173,000
Net Earnings (Loss)	6,603,000	14,521,000	7,950,000	22,712,000
Earnings (Loss) Attributable to Common Stock	$ 6,387,000	$ 14,010,000	$ 7,685,000	$ 21,920,000
Basic Earnings (Loss) per Common Share	$ 0.59	$ 1.23	$ 0.71	$ 1.90
Diluted Earnings (Loss) per Common Share	$ 0.59	$ 1.22	$ 0.71	$ 1.89