Discontinued Operations (Summary Of Results) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 74,561	$ 69,516	$ 147,415	$ 135,458
Cost of sales	(57,001)	(52,349)	(109,729)	(102,243)
Selling and general expenses	(5,418)	(5,614)	(11,178)	(11,441)
Gain on divestiture of business, net			11,413
Other income	980	188	1,930	371
Earnings from discontinued operations, net of tax	771	338	8,953	1,039
Discontinued Operations Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		18,469	421	39,024
Cost of sales	(17)	(17,220)	(485)	(36,042)
Selling and general expenses	2	(738)	(24)	(1,414)
Gain on divestiture of business, net	709		11,413
Other income	430	(3)	2,078	(3)
Earnings from discontinued operations before provision for income taxes	1,124	508	13,403	1,565
Provision for income taxes from discontinued operations	353	170	4,450	526
Earnings from discontinued operations, net of tax	$ 771	$ 338	$ 8,953	$ 1,039