Derivative Instruments and Hedging Activities (Details) (USD $)					9 Months Ended
	Sep. 27, 2014 Designated as Hedging Instrument [Member]		Dec. 28, 2013 Designated as Hedging Instrument [Member]		Sep. 27, 2014 Commodity Contracts [Member] Cash Flow Hedging [Member] Long [Member]	Sep. 27, 2014 Commodity Contracts [Member] Fair Value Hedging [Member] Short [Member]	Sep. 27, 2014 Other Current Asset [Member] Commodity Contracts [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Current Asset [Member] Commodity Contracts [Member] Designated as Hedging Instrument [Member]	Sep. 27, 2014 Other Current Asset [Member] Foreign Currency Contracts [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Current Asset [Member] Foreign Currency Contracts [Member] Designated as Hedging Instrument [Member]	Sep. 27, 2014 Other Assets [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Assets [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]	Sep. 27, 2014 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]	Sep. 27, 2014 Other Current Liabilities [Member] Foreign Currency Contracts [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Current Liabilities [Member] Foreign Currency Contracts [Member] Designated as Hedging Instrument [Member]	Sep. 27, 2014 Other Liabilities [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]	Dec. 28, 2013 Other Liabilities [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Open future contracts to purchase copper					$ 18,000,000	$ 11,400,000
Time period for open copper future contract purchases					15 months	6 months
Fair value of future contracts with gain (loss) position					(99,000)	445,000
Other assets: Gain positions											8,000	1,324,000
Other current assets: Gain positions							526,000	448,000	0	836,000
Other current assets: Loss positions							(76,000)	(10,000)
Other current liability: Gain positions													10,000	340,000		0
Other current liability: Loss positions													(115,000)	(2,107,000)	(68,000)
Other liabilities: Loss positions																	0	0
Assets fair value	458,000	[1]	2,598,000	[1]
Liabilities fair value	$ (173,000)	[1]	$ (1,767,000)	[1]

[1] Does not include the impact of cash collateral received from or provided to counterparties.