Discontinued Operations (Schedule of Gains and Losses on Disposition of Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain (loss) on disposition of discontinued operations before income taxes	$ 482	$ (157)	$ 1,017	$ (1,741)
IDS [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain (loss) on disposition of discontinued operations before income taxes	0	(111)	16	(1,696)
Photoflash Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain (loss) on disposition of discontinued operations before income taxes	485	(13)	992	(9)
Other Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain (loss) on disposition of discontinued operations before income taxes	$ (3)	$ (33)	$ 9	$ (36)