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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
CONSOLIDATED STATEMENTS OF INCOME [Abstract] |  |  |
Proforma net sales | $ 2,364,227 us-gaap_SalesRevenueGoodsNet | $ 2,158,541 us-gaap_SalesRevenueGoodsNet | $ 2,189,938 us-gaap_SalesRevenueGoodsNet
Cost of goods sold | 2,043,719 us-gaap_CostOfGoodsSold | 1,862,089 us-gaap_CostOfGoodsSold | 1,904,463 us-gaap_CostOfGoodsSold
Depreciation and amortization | 33,735 us-gaap_OtherDepreciationAndAmortization | 32,394 us-gaap_OtherDepreciationAndAmortization | 31,495 us-gaap_OtherDepreciationAndAmortization
Selling, general, and administrative expense | 131,740 us-gaap_SellingGeneralAndAdministrativeExpense | 134,914 us-gaap_SellingGeneralAndAdministrativeExpense | 129,456 us-gaap_SellingGeneralAndAdministrativeExpense
Insurance settlements | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery | (106,332)us-gaap_GainOnBusinessInterruptionInsuranceRecovery | (1,500)us-gaap_GainOnBusinessInterruptionInsuranceRecovery
Gain on sale of assets | (6,259)us-gaap_GainLossOnDispositionOfAssets | (39,765)us-gaap_GainLossOnDispositionOfAssets | 0 us-gaap_GainLossOnDispositionOfAssets
Impairment charges | 0 us-gaap_AssetImpairmentCharges | 4,304 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges
Litigation settlements | 0 us-gaap_LitigationSettlementExpense | 0 us-gaap_LitigationSettlementExpense | (4,050)us-gaap_LitigationSettlementExpense
Severance | 7,296 us-gaap_SeveranceCosts1 | 0 us-gaap_SeveranceCosts1 | 3,369 us-gaap_SeveranceCosts1
Operating income | 153,996 us-gaap_OperatingIncomeLoss | 270,937 us-gaap_OperatingIncomeLoss | 126,705 us-gaap_OperatingIncomeLoss
Interest expense | (5,740)us-gaap_InterestExpense | (3,990)us-gaap_InterestExpense | (6,890)us-gaap_InterestExpense
Other (expense) income, net | (243)us-gaap_OtherNonoperatingIncomeExpense | 4,451 us-gaap_OtherNonoperatingIncomeExpense | 539 us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes | 148,013 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 271,398 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 120,354 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | (45,479)us-gaap_IncomeTaxExpenseBenefit | (98,109)us-gaap_IncomeTaxExpenseBenefit | (36,681)us-gaap_IncomeTaxExpenseBenefit
Consolidated net income | 102,534 us-gaap_ProfitLoss | 173,289 us-gaap_ProfitLoss | 83,673 us-gaap_ProfitLoss
Less net income attributable to noncontrolling interest | (974)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (689)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,278)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Mueller Industries, Inc. | $ 101,560 us-gaap_NetIncomeLoss | $ 172,600 us-gaap_NetIncomeLoss | $ 82,395 us-gaap_NetIncomeLoss
Weighted average shares for basic earnings per share (in shares) | 56,042 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 55,742 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 70,664 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock-based awards (in shares) | 726 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 742 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 828 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Adjusted weighted average shares for diluted earnings per share (in shares) | 56,768 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 56,484 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 71,492 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share (in dollars per share) | $ 1.81 us-gaap_EarningsPerShareBasic | $ 3.10 us-gaap_EarningsPerShareBasic | $ 1.17 us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) | $ 1.79 us-gaap_EarningsPerShareDiluted | $ 3.06 us-gaap_EarningsPerShareDiluted | $ 1.15 us-gaap_EarningsPerShareDiluted
Dividends per share (in dollars per share) | $ 0.3000 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.2500 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.2125 us-gaap_CommonStockDividendsPerShareDeclared

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