Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 26, 2015	Dec. 27, 2014
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Assets fair value	[1]	$ 60	$ 95
Liabilities fair value	[1]	(3,359)	(1,825)
Commodity Contracts [Member] | Cash Flow Hedging [Member] | Long [Member]
Derivatives, Fair Value [Line Items]
Open future contracts to purchase copper		$ 33,900
Time period for open copper future contract purchases		12 months
Fair value of future contracts with gain (loss) position		$ (1,500)
Commodity Contracts [Member] | Fair Value Hedging [Member] | Short [Member]
Derivatives, Fair Value [Line Items]
Open future contracts to sell copper		$ 13,600
Time period for open copper future contract sales		3 months
Fair value of future contracts with gain (loss) position		$ (30)
Other Current Asset [Member] | Commodity Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions		60	99
Other current assets: Loss positions		0	(4)
Other Current Asset [Member] | Foreign Currency Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions		0	0
Other current assets: Loss positions		0	0
Other Assets [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets: Gain positions		0	0
Other Current Liabilities [Member] | Commodity Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions		238	15
Other current liability: Loss positions		(1,864)	(832)
Other Current Liabilities [Member] | Foreign Currency Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions		34	0
Other current liability: Loss positions		(75)	(81)
Other Liabilities [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other liabilities: Loss positions		$ (1,692)	$ (927)

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