Derivative Instruments and Hedging Activities (Details) (USD $)	9 Months Ended
	Sep. 28, 2013	Sep. 28, 2013 Interest Rate Swap [Member]	Dec. 29, 2012 Other Current Asset [Member] Commodity Contracts [Member] Fair Value Hedging [Member] Designated as Hedging Instrument [Member]	Sep. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Dec. 29, 2012 Other Current Liabilities [Member] Commodity Contracts [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Sep. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Fair Value Hedging [Member] Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities [Abstract]
Net value in OCI to be reclassified into earnings in next twelve months	$ 172,000
Open future contracts to purchase copper	18,500,000
Time period for open copper future contract purchases	18 months
Fair value of future contracts with loss position	140,000
Derivatives, Fair Value [Line Items]
Other assets: gain positions		1,000,000
Other current assets: gain positions			1,047,000
Other current assets: loss positions			(548,000)
Other current liability: gain positions				222,000	172,000	203,000
Other current liability: loss positions				(362,000)	(420,000)	(1,355,000)
Open future contracts to sell copper	61,000,000
Time period for open future contract sales	6 months
Restricted cash related to open future contracts	$ 2,900,000