Derivative Instruments and Hedging Activities (Details) (USD $)									6 Months Ended
	Jun. 28, 2014	Dec. 28, 2013	Jun. 28, 2014 Designated as Hedging Instrument [Member]		Dec. 28, 2013 Designated as Hedging Instrument [Member]		Jun. 28, 2014 Commodity Contracts [Member]	Dec. 28, 2013 Commodity Contracts [Member]	Jun. 28, 2014 Commodity Contracts [Member] Cash Flow Hedging [Member] Long [Member]	Jun. 28, 2014 Commodity Contracts [Member] Fair Value Hedging [Member] Short [Member]	Jun. 28, 2014 Foreign Currency Contracts [Member]	Dec. 28, 2013 Foreign Currency Contracts [Member]	Jun. 28, 2014 Interest Rate Swap [Member]	Dec. 28, 2013 Interest Rate Swap [Member]	Jun. 28, 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]	Jun. 28, 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]	Jun. 28, 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]	Jun. 28, 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]	Jun. 28, 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]	Jun. 28, 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									$ 19,600,000	$ 18,700,000
Time period for open copper future contract purchases									13 months	6 months
Fair value of future contracts with gain (loss) position									438,000	(24,000)
Other assets: Gain positions																			0	1,324,000
Other current assets: Gain positions	832,000	2,608,000					513,000	448,000			319,000	836,000	0	1,324,000	513,000	448,000	319,000	836,000
Other current assets: Loss positions	(52,000)	(10,000)					(52,000)	(10,000)			0	0	0	0	(52,000)	(10,000)
Other current liability: Gain positions	0	(340,000)					0	(340,000)			0	0	0	0							0	340,000	0	0
Other current liability: Loss positions	711,000	2,107,000					47,000	2,107,000			0	0	664,000	0							(47,000)	(2,107,000)
Other liabilities: Loss positions																									(664,000)	0
Assets fair value			780,000	[1]	2,598,000	[1]
Liabilities fair value			$ (711,000)	[1]	$ (1,767,000)	[1]

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