Discontinued Operations (Summary Of Results) (Details) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Jul. 01, 2018	Apr. 01, 2018	Jul. 02, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 63,850,000		$ 76,826,000
Cost of sales	(51,358,000)		(56,549,000)
Selling and general expenses	(6,444,000)		(6,151,000)
Other income	$ 1,632,000		895,000
Earnings (loss) from discontinued operations, net of tax			(8,000)
Discontinued Operations Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost of sales			(11,000)
Gain on divestiture, net		$ 0		$ 11,413,000
Earnings (loss) from discontinued operations before provision for income taxes			(11,000)
Provision for (benefit from) income taxes from discontinued operations			(3,000)
Earnings (loss) from discontinued operations, net of tax			$ (8,000)