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Quarterly Financial Information (Unaudited) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 537,342,000 us-gaap_SalesRevenueNet | [1] | $ 602,820,000 us-gaap_SalesRevenueNet | [1] | $ 649,691,000 us-gaap_SalesRevenueNet | [1] | $ 574,374,000 us-gaap_SalesRevenueNet | [1] | $ 487,715,000 us-gaap_SalesRevenueNet | [1] | $ 528,854,000 us-gaap_SalesRevenueNet | [1] | $ 582,282,000 us-gaap_SalesRevenueNet | [1] | $ 559,690,000 us-gaap_SalesRevenueNet | [1] |  |  |
Gross profit | 68,453,000 us-gaap_GrossProfit | [1],[2] | 81,542,000 us-gaap_GrossProfit | [1],[2] | 91,916,000 us-gaap_GrossProfit | [1],[2] | 78,597,000 us-gaap_GrossProfit | [1],[2] | 65,903,000 us-gaap_GrossProfit | [1],[2] | 72,552,000 us-gaap_GrossProfit | [1],[2] | 81,157,000 us-gaap_GrossProfit | [1],[2] | 76,840,000 us-gaap_GrossProfit | [1],[2] |  |  |
Consolidated net income | 18,049,000 us-gaap_ProfitLoss | [1],[3],[4] | 24,322,000 us-gaap_ProfitLoss | [1],[3] | 35,209,000 us-gaap_ProfitLoss | [1],[3] | 24,954,000 us-gaap_ProfitLoss | [1],[3] | 15,020,000 us-gaap_ProfitLoss | [1] | 39,993,000 us-gaap_ProfitLoss | [1],[5] | 91,842,000 us-gaap_ProfitLoss | [1],[6] | 26,434,000 us-gaap_ProfitLoss | [1] | 102,534,000 us-gaap_ProfitLoss | 173,289,000 us-gaap_ProfitLoss | 83,673,000 us-gaap_ProfitLoss
Net income attributable to Mueller Industries, Inc. | 17,987,000 us-gaap_NetIncomeLoss | [1] | 23,823,000 us-gaap_NetIncomeLoss | [1] | 35,045,000 us-gaap_NetIncomeLoss | [1] | 24,706,000 us-gaap_NetIncomeLoss | [1] | 15,384,000 us-gaap_NetIncomeLoss | [1] | 39,864,000 us-gaap_NetIncomeLoss | [1] | 91,150,000 us-gaap_NetIncomeLoss | [1] | 26,202,000 us-gaap_NetIncomeLoss | [1] | 101,560,000 us-gaap_NetIncomeLoss | 172,600,000 us-gaap_NetIncomeLoss | 82,395,000 us-gaap_NetIncomeLoss
Basic earnings per share (in dollars per share) | $ 0.32 us-gaap_EarningsPerShareBasic | [1] | $ 0.42 us-gaap_EarningsPerShareBasic | [1] | $ 0.63 us-gaap_EarningsPerShareBasic | [1] | $ 0.44 us-gaap_EarningsPerShareBasic | [1] | $ 0.28 us-gaap_EarningsPerShareBasic | [1] | $ 0.71 us-gaap_EarningsPerShareBasic | [1] | $ 1.64 us-gaap_EarningsPerShareBasic | [1] | $ 0.47 us-gaap_EarningsPerShareBasic | [1] | $ 1.81 us-gaap_EarningsPerShareBasic | $ 3.10 us-gaap_EarningsPerShareBasic | $ 1.17 us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) | $ 0.32 us-gaap_EarningsPerShareDiluted | [1] | $ 0.42 us-gaap_EarningsPerShareDiluted | [1] | $ 0.62 us-gaap_EarningsPerShareDiluted | [1] | $ 0.44 us-gaap_EarningsPerShareDiluted | [1] | $ 0.27 us-gaap_EarningsPerShareDiluted | [1] | $ 0.71 us-gaap_EarningsPerShareDiluted | [1] | $ 1.62 us-gaap_EarningsPerShareDiluted | [1] | $ 0.46 us-gaap_EarningsPerShareDiluted | [1] | $ 1.79 us-gaap_EarningsPerShareDiluted | $ 3.06 us-gaap_EarningsPerShareDiluted | $ 1.15 us-gaap_EarningsPerShareDiluted
Dividends per share (in dollars per share) | $ 0.075 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.075 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.075 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.075 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.0625 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.0625 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.0625 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.0625 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.3000 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.2500 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.2125 us-gaap_CommonStockDividendsPerShareDeclared
Pre-tax charges related to severance | 4,200,000 us-gaap_SeveranceCosts1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,296,000 us-gaap_SeveranceCosts1 | 0 us-gaap_SeveranceCosts1 | 3,369,000 us-gaap_SeveranceCosts1
Gain on insurance settlement |  |  |  |  |  |  |  |  |  |  |  |  | 106,300,000 mli_InsuranceSettlementProceeds |  |  |  |  |  |
Gain on sale of manufacturing assets | 4,800,000 us-gaap_GainLossOnDispositionOfAssets |  |  |  |  |  |  |  |  |  | 39,800,000 us-gaap_GainLossOnDispositionOfAssets |  |  |  |  |  | 6,259,000 us-gaap_GainLossOnDispositionOfAssets | 39,765,000 us-gaap_GainLossOnDispositionOfAssets | 0 us-gaap_GainLossOnDispositionOfAssets
Pre-tax impairment charges related to real property |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 mli_PreTaxImpairmentChargesRelatedToRealProperty |  |  |  |  |  |  |  |
[1] | The sum of quarterly amounts may not equal the annual amounts reported due to rounding. In addition, the earnings per share amounts are computed independently for each quarter while the full year is based on the weighted average shares outstanding.
[2] | Gross profit is net sales less cost of goods sold, which excludes depreciation and amortization.
[3] | Includes income earned by Howell, acquired during Q4 2013, and losses incurred by Yorkshire, acquired during Q1 2014
[4] | Includes $4.8 million pre-tax gain on sale of assets and $4.2 million of pre-tax charges related to severance
[5] | Includes $39.8 million pre-tax gain on sale of manufacturing assets and pre-tax impairment charges of $4.3 million primarily related to real property associated with the aforementioned plastics sale transaction.
[6] | Includes $106.3 million pre-tax gain from settlement of insurance claims.

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- Definition The gross income statement effect of insurance proceeds for each material event or transaction (that would not reasonably be expected to recur in the foreseeable future) that possesses a high degree of abnormality and are clearly unrelated to, or incidentally related to, the ordinary and typical activities of the entity. + References No definition available. + Details
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