Discontinued Operations (Environmental Remediation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013 sites	Dec. 29, 2012
Environmental Exit Cost [Line Items]
Previously Owned Sites with Environmental Obligations	5
Sites that Require Natural Attenuation	4
Accrual for Environmental Loss Contingencies	$ 1,837	$ 1,838
Sites with Natural Attenuation [Member] | Minimum [Member]
Environmental Exit Cost [Line Items]
Years to Remediate Environmental Obligations	10
Sites with Natural Attenuation [Member] | Maximum [Member]
Environmental Exit Cost [Line Items]
Years to Remediate Environmental Obligations	20
Sites with Pump and Treat Remediation [Member]
Environmental Exit Cost [Line Items]
Years to Remediate Environmental Obligations	25
Sites with Oxidation-Based Remediation [Member]
Environmental Exit Cost [Line Items]
Years to Remediate Environmental Obligations	7