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Derivative Instruments and Hedging Activities (Details) (USD $) | 9 Months Ended |  |  |  |  |
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Sep. 28, 2013 | Sep. 28, 2013 Interest Rate Swap [Member] | Dec. 29, 2012 Other Current Asset [Member] Commodity Contracts [Member] Fair Value Hedging [Member] Designated as Hedging Instrument [Member] | Sep. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member] | Dec. 29, 2012 Other Current Liabilities [Member] Commodity Contracts [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member] | Sep. 28, 2013 Other Current Liabilities [Member] Commodity Contracts [Member] Fair Value Hedging [Member] Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities [Abstract] |  |  |  |  |  |
Net value in OCI to be reclassified into earnings in next twelve months | $ 172,000 |  |  |  |  |
Open future contracts to purchase copper | 18,500,000 |  |  |  |  |
Time period for open copper future contract purchases | 18 months |  |  |  |  |
Fair value of future contracts with loss position | 140,000 |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Other assets: gain positions |  | 1,000,000 |  |  |  |
Other current assets: gain positions |  |  | 1,047,000 |  |  |
Other current assets: loss positions |  |  | (548,000) |  |  |
Other current liability: gain positions |  |  |  | 222,000 | 172,000 | 203,000
Other current liability: loss positions |  |  |  | (362,000) | (420,000) | (1,355,000)
Open future contracts to sell copper | 61,000,000 |  |  |  |  |
Time period for open future contract sales | 6 months |  |  |  |  |
Restricted cash related to open future contracts | $ 2,900,000 |  |  |  |  |

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