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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Debt Instrument [Line Items]    
Long-term debt, gross $ 386,792 $ 497,555
Less debt issuance costs (538) (857)
Less current portion of debt (7,530) (7,101)
Long-term debt 378,724 489,597
Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 284,479 284,479
Debt, stated interest rate 6.00%  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 90,000 195,000
Debt, stated interest rate 3.20%  
Jungwoo Mueller Line of Credit Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 0 5,264
Debt, stated interest rate 2.86%  
Jungwoo Mueller Line of Credit Due 2020 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,768 5,104
Debt, stated interest rate 2.55%  
2001 Series IRB's With Interest at 1.23% Due 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,250 2,250
Debt, stated interest rate 3.03%  
Other [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,295 $ 5,458