CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Income Statement [Abstract]
Net Sales	$ 447,918	$ 446,250	$ 990,617	$ 941,640
Costs and Expenses:
Cost of Product Sold	397,881	411,736	913,371	862,715
Selling and Administrative	19,195	15,913	50,708	45,006
Plant Restructuring	0	109	39	1,320
Other Operating Income	(707)	(720)	(876)	(804)
Total Costs and Expenses	416,369	427,038	963,242	908,237
Operating Income (Loss)	31,549	19,212	27,375	33,403
Interest Expense, Net	2,164	2,414	5,830	6,590
Earnings (Loss) Before Income Taxes	29,385	16,798	21,545	26,813
Income Taxes Expense (Benefit)	10,855	5,336	8,107	7,265
Net Earnings (Loss)	18,530	11,462	13,438	19,548
Earnings (Loss) Attributable to Common Stock	$ 17,897	$ 11,064	$ 12,964	$ 18,497
Basic Earnings (Loss) per Common Share (Note 12)	$ 1.53	$ 0.94	$ 1.10	$ 1.61
Diluted Earnings (Loss) per Common Share (Note 12)	$ 1.52	$ 0.94	$ 1.10	$ 1.60