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Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 27, 2020
Dec. 28, 2019
Derivative [Line Items]    
Restricted cash in other current assets as collateral related to open derivative contracts $ 100 $ 200
Commodity Contracts [Member]    
Derivative [Line Items]    
Deferred net losses, net of tax, included in AOCI (300)  
Cash Flow Hedging [Member] | Commodity Contracts [Member] | Long [Member]    
Derivative [Line Items]    
Open option contracts written, at fair value $ 25,400  
Time period for open copper future contract purchases 15 months  
Fair value of future contracts with net gain (loss) position $ 1,200  
Fair Value Hedging [Member] | Commodity Contracts [Member] | Short [Member]    
Derivative [Line Items]    
Fair value of future contracts with net gain (loss) position (88)  
Open future contracts to sell copper $ 600  
Time period for open copper future contract sales 9 months