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Accumulated Other Comprehensive Income (Loss) - Reclassification Adjustments Out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods sold | $ 545,670 | $ 488,427 | [1]
Interest expense | 5,909 | 2,531 | [1]
Income tax (benefit) expense | 7,395 | 11,929 | [1]
Net income attributable to Mueller Industries, Inc. | (24,128) | (29,987) | [1]
Other income, net | (560) | (594) | [1]
Unrealized losses (gains) on derivatives [Member] | Amount Reclassified from AOCI [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods sold | (365) | 422 |
Interest expense | 0 | 232 |
Income tax (benefit) expense | 73 | (153) |
Net income attributable to Mueller Industries, Inc. | (292) | 501 |
Amortization of net loss and prior service cost on employee benefit plans [Member] | Amount Reclassified from AOCI [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income tax (benefit) expense | (22) | (64) |
Net income attributable to Mueller Industries, Inc. | 119 | 262 |
Other income, net | 141 | 326 |
Sale of available-for-sale securities [Member] | Amount Reclassified from AOCI [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income tax (benefit) expense | 0 | 94 |
Net income attributable to Mueller Industries, Inc. | 0 | (160) |
Other income, net | $ 0 | $ (254) |
[1] | The Condensed Consolidated Statement of Income for the quarter ended April 1, 2017 has been adjusted to reflect the adoption of ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The components of net periodic benefit cost (income) other than the service cost component are included in other income, net in the Condensed Consolidated Statements of Income. Refer to Note 1 for further discussion.

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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