Discontinued Operations (Summary Of Results) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Jul. 02, 2017	Oct. 01, 2017	Oct. 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 70,614	$ 74,533		$ 218,029	$ 209,991
Cost of sales	(51,722)	(57,439)		(161,451)	(159,682)
Selling and general expenses	(5,729)	(5,666)		(16,907)	(17,107)
Gain on divestiture of business, net				11,413
Other income	792	225		2,722	596
Earnings from discontinued operations, net of tax	(6)	537		8,947	1,576
Discontinued Operations Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		18,545		421	57,569
Cost of sales	(133)	(17,175)		(618)	(53,217)
Selling and general expenses		(560)		(24)	(1,974)
Gain on divestiture of business, net			$ 11,413	11,413
Other income		(2)		2,078	(5)
Earnings from discontinued operations before provision for income taxes	(133)	808		13,270	2,373
Provision for income taxes from discontinued operations	(127)	271		4,323	797
Earnings from discontinued operations, net of tax	$ (6)	$ 537		$ 8,947	$ 1,576