XML 53 R40.htm IDEA: XBRL DOCUMENT v3.19.2
Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 29, 2019
Dec. 29, 2018
Derivative [Line Items]    
Restricted cash in other current assets as collateral related to open derivative contracts $ 1,800 $ 3,600
Commodity Contracts [Member]    
Derivative [Line Items]    
Deferred net losses, net of tax, included in AOCI (42)  
Cash Flow Hedging [Member] | Commodity Contracts [Member] | Long [Member]    
Derivative [Line Items]    
Open option contracts written, at fair value $ 55,600  
Time period for open copper future contract purchases 13 months  
Fair value of future contracts with net loss position $ 17  
Fair Value Hedging [Member] | Commodity Contracts [Member] | Short [Member]    
Derivative [Line Items]    
Fair value of future contracts with net loss position 32  
Open future contracts to sell copper $ 1,200  
Time period for open copper future contract sales 9 months