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

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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