Derivative Instruments and Hedging Activities (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 29, 2014 Interest Rate Swap [Member]	Mar. 29, 2014 Other Current Asset [Member] Commodity Contracts [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Current Asset [Member] Commodity Contracts [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Mar. 29, 2014 Other Current Asset [Member] Commodity Contracts [Member] Fair Value Hedging [Member] Designated as Hedging Instrument [Member]	Mar. 29, 2014 Other Current Liabilities [Member] Commodity Contracts [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Fair Value Hedging [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Fair Value Hedging [Member] Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities [Abstract]
Net fair value of cash flow hedges whose realized losses would be reclassified into earnings	$ 664,000
Open future contracts to purchase copper	34,900,000
Time period for open copper future contract purchases	16 months
Fair value of future contracts with loss position	664,000
Derivatives, Fair Value [Line Items]
Other assets: Gain positions		900,000
Other current assets: Gain positions			46,000	448,000	294,000
Other current assets: Loss positions			(6,000)	(10,000)
Other current liability: Gain positions						277,000	22,000	318,000
Other current liability: Loss positions						(981,000)	(50,000)	(2,057,000)
Open future contracts to sell copper	5,200,000
Time period for open future contract sales	6 months
Restricted cash related to open future contracts	$ 800,000