Derivative Instruments and Hedging Activities (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 28, 2013 Interest Rate Swap [Member]	Dec. 28, 2013 Other Current Asset [Member] Commodity Contracts [Member] Designated as Hedging Instrument [Member]	Dec. 29, 2012 Other Current Asset [Member] Commodity Contracts [Member] Designated as Hedging Instrument [Member] Fair Value Hedging [Member]	Dec. 29, 2012 Other Current Liabilities [Member] Commodity Contracts [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Designated as Hedging Instrument [Member] Fair Value Hedging [Member]	Dec. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Not Designated as Hedging Instrument [Member] Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities [Abstract]
Net fair value of cash flow hedges whose realized gains would be reclassified into earnings	$ 408,000
Open future contracts to purchase copper	15,900,000
Time period for open copper future contract purchases	15 months
Fair value of future contracts with loss/gain position	438,000
Derivatives, Fair Value [Line Items]
Other assets: gain positions		1,300,000
Other current assets: gain positions			448,000	1,047,000
Other current assets: loss positions			(10,000)	(548,000)
Other current liability: gain positions					172,000	22,000	318,000
Other current liability: loss positions					(420,000)	(50,000)	(2,057,000)
Restricted cash related to open future contracts	2,100,000
Open future contracts to sell copper	$ 70,600,000
Time period for open future contract sales	5 months