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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Debt Instrument [Line Items]    
Long-term debt, gross $ 328,095 $ 386,792
Less debt issuance costs (219) (538)
Less current portion of debt (41,283) (7,530)
Long-term debt $ 286,593 378,724
Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate (as a percent) 6.00%  
Long-term debt, gross $ 284,479 284,479
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate (as a percent) 1.52%  
Long-term debt, gross $ 35,000 90,000
Jungwoo Mueller Line of Credit Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate (as a percent) 1.90%  
Long-term debt, gross $ 5,811 0
Jungwoo Mueller Line of Credit Due 2020 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate (as a percent) 2.55%  
Long-term debt, gross $ 0 5,768
2001 Series IRB's With Interest at 1.23% Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate (as a percent) 1.14%  
Long-term debt, gross $ 250 1,250
Other [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 2,555 $ 5,295