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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract] |  |
Net sales | $ 537,242 us-gaap_SalesRevenueGoodsNet | $ 574,374 us-gaap_SalesRevenueGoodsNet
Cost of goods sold | 460,834 us-gaap_CostOfGoodsSold | 495,777 us-gaap_CostOfGoodsSold
Depreciation and amortization | 7,853 us-gaap_OtherDepreciationAndAmortization | 8,107 us-gaap_OtherDepreciationAndAmortization
Selling, general, and administrative expense | 32,831 us-gaap_SellingGeneralAndAdministrativeExpense | 32,183 us-gaap_SellingGeneralAndAdministrativeExpense
Operating income | 35,724 us-gaap_OperatingIncomeLoss | 38,307 us-gaap_OperatingIncomeLoss
Interest expense | (2,076)us-gaap_InterestExpense | (1,026)us-gaap_InterestExpense
Other income, net | 105 us-gaap_OtherNonoperatingIncomeExpense | 88 us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes | 33,753 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 37,369 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | (11,413)us-gaap_IncomeTaxExpenseBenefit | (12,415)us-gaap_IncomeTaxExpenseBenefit
Consolidated net income | 22,340 us-gaap_ProfitLoss | 24,954 us-gaap_ProfitLoss
Net income attributable to noncontrolling interest | (362)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (248)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Mueller Industries, Inc. | $ 21,978 us-gaap_NetIncomeLoss | $ 24,706 us-gaap_NetIncomeLoss
Weighted average shares for basic earnings per share (in shares) | 56,193 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 55,918 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock-based awards (in shares) | 731 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 853 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Adjusted weighted average shares for diluted earnings per share (in shares) | 56,924 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 56,771 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share (in dollars per share) | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.44 us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted
Dividends per share (in dollars per share) | $ 0.075 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.075 us-gaap_CommonStockDividendsPerShareDeclared

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