Derivative Instruments and Hedging Activities (Details) (USD $)	6 Months Ended
	Jun. 29, 2013	Dec. 29, 2012 Commodity Contracts [Member]	Jun. 29, 2013 Interest Rate Swap [Member]	Dec. 29, 2012 Other Current Liabilities [Member]	Jun. 29, 2013 Other Current Liabilities [Member] Commodity Contracts [Member]
Derivative Instruments and Hedging Activities [Abstract]
Net value in OCI to be reclassified into earnings in next twelve months	$ 1,600,000
Open future contracts to purchase copper	24,500,000
Time period for open copper future contract purchases	21 months
Fair value of future contracts with loss position	1,600,000
Derivatives, Fair Value [Line Items]
Other current assets: gain positions			2,200,000
Other current liability: gain positions		172,000
Other current liability: loss positions				(420,000)	(1,636,000)
Restricted cash related to open future contracts	3,200,000
Open future contracts to sell copper	$ 43,700,000
Time period for open future contract sales	6 months