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Debt (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term debt, gross $ 466,247 $ 228,321
Less debt issuance costs (1,175) (957)
Less current portion of debt (16,480) (13,655)
Long-term debt 448,592 213,709
Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 284,536 0
Debt, stated interest rate 6.00%  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 160,000 200,000
Debt, stated interest rate 3.06%  
Jungwoo Mueller Line of Credit Due 2018 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,119 4,724
Debt, stated interest rate 2.72%  
Jungwoo Mueller Line of Credit Due 2017 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 8,648 7,990
Debt, stated interest rate 3.19%  
2001 Series IRB's With Interest at 1.23% Due 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 3,250 4,250
Debt, stated interest rate 2.22%  
Mueller Xingrong Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 0 3,048
Other [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 4,694 $ 8,309