Derivative Instruments and Hedging Activities (Details) (USD $)	12 Months Ended
	Dec. 27, 2014		Dec. 28, 2013
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Assets fair value	$ 95,000	[1]	$ 2,598,000	[1]
Liabilities fair value	(1,825,000)	[1]	(1,767,000)	[1]
Commodity Contracts [Member] | Cash Flow Hedging [Member] | Long [Member]
Derivatives, Fair Value [Line Items]
Open future contracts to purchase copper	23,700,000
Time period for open copper future contract purchases	12 months
Fair value of future contracts with gain (loss) position	(809,000)
Commodity Contracts [Member] | Fair Value Hedging [Member] | Short [Member]
Derivatives, Fair Value [Line Items]
Open future contracts to sell copper	1,600,000
Time period for open copper future contract sales	3 months
Fair value of future contracts with gain (loss) position	87,000
Other Current Asset [Member] | Commodity Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions	99,000		448,000
Other current assets: Loss positions	(4,000)		(10,000)
Other Current Asset [Member] | Foreign Currency Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions	0		836,000
Other Assets [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets: Gain positions	0		1,324,000
Other Current Liabilities [Member] | Commodity Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions	15,000		340,000
Other current liability: Loss positions	(832,000)		(2,107,000)
Other Current Liabilities [Member] | Foreign Currency Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions			0
Other current liability: Loss positions	(81,000)
Other Liabilities [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other liabilities: Loss positions	$ (927,000)		$ 0

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