CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)	3 Months Ended		6 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Income Statement [Abstract]
Net Sales	$ 357,247,000	$ 313,202,000	$ 609,861,000	$ 539,460,000
Costs and Expenses:
Cost of Product Sold	327,035,000	284,129,000	559,674,000	489,488,000
Selling and Administrative	18,702,000	17,394,000	35,907,000	32,450,000
Plant Restructuring	277,000	15,000	1,462,000	(66,000)
Other Operating (Income) Loss	31,000	(67,000)	19,000	(403,000)
Total Costs and Expenses	346,045,000	301,471,000	597,062,000	521,469,000
Operating Income (Loss)	11,202,000	11,731,000	12,799,000	17,991,000
Interest Expense, Net	2,151,000	1,889,000	4,295,000	3,581,000
Earnings From Equity Investment	270,000	86,000	(167,000)	86,000
Earnings (Loss) Before Income Taxes	8,781,000	9,756,000	8,671,000	14,324,000
Income Taxes Expense (Benefit)	2,637,000	3,234,000	2,589,000	4,834,000
Net Earnings (Loss)	6,144,000	6,522,000	6,082,000	9,490,000
Earnings (Loss) Attributable to Common Stock	$ 6,082,000	$ 6,456,000	$ 6,014,000	$ 9,376,000
Basic Earnings (Loss) per Common Share	$ 0.62	$ 0.65	$ 0.61	$ 0.95
Diluted Earnings (Loss) per Common Share	$ 0.62	$ 0.65	$ 0.61	$ 0.94