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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

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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