CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 26, 2015	Dec. 27, 2014
Income Statement [Abstract]
Net Sales	$ 432,198	$ 456,207	$ 971,658	$ 1,008,411
Costs and Expenses:
Cost of Product Sold	379,075	430,123	869,182	948,527
Selling and Administrative	19,505	18,759	51,955	50,681
Plant Restructuring	9,624	889	9,558	889
Other Operating (Income) Loss	(24,197)	(5,033)	(24,600)	(4,839)
Total Costs and Expenses	384,007	444,738	906,095	995,258
Operating Income (Loss)	48,191	11,469	65,563	13,153
Interest Expense, Net	1,932	1,431	4,894	3,917
Earnings From Equity Investment	46	55	132	(231)
Earnings (Loss) Before Income Taxes	46,213	9,983	60,537	9,467
Income Taxes Expense (Benefit)	15,090	2,164	19,924	2,333
Net Earnings (Loss)	31,123	7,819	40,613	7,134
Earnings (Loss) Attributable to Common Stock	$ 30,832	$ 7,711	$ 40,180	$ 6,995
Basic Earnings (Loss) per Common Share	$ 3.12	$ 0.72	$ 4.06	$ 0.65
Diluted Earnings (Loss) per Common Share	$ 3.1	$ 0.71	$ 4.04	$ 0.65