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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Debt Instrument [Line Items]    
Long-term debt, gross $ 497,555 $ 466,247
Less debt issuance costs (857) (1,175)
Less current portion of debt (7,101) (16,480)
Long-term debt 489,597 448,592
Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 284,479 284,536
Debt, stated interest rate 6.00%  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 195,000 160,000
Debt, stated interest rate 3.97%  
Jungwoo Mueller Line of Credit Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,264 5,119
Debt, stated interest rate 2.86%  
Jungwoo Mueller Line of Credit Due 2020 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,104 8,648
Debt, stated interest rate 3.45%  
2001 Series IRB's With Interest at 1.23% Due 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 2,250 3,250
Debt, stated interest rate 3.22%  
Other [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,458 $ 4,694