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Acquisitions and Dispositions (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 27, 2014 | Jun. 28, 2014 | Sep. 28, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012 | Aug. 09, 2013 | Mar. 29, 2014 | Nov. 21, 2014 | Nov. 30, 2014 | Feb. 28, 2014 | Aug. 16, 2012 | Oct. 17, 2013 | Aug. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance | $ 4,200,000 us-gaap_SeveranceCosts1 |  |  | $ 7,296,000 us-gaap_SeveranceCosts1 | $ 0 us-gaap_SeveranceCosts1 | $ 3,369,000 us-gaap_SeveranceCosts1 |  |  |  |  |  |  |  |
Proforma net sales |  |  |  | 2,364,227,000 us-gaap_SalesRevenueGoodsNet | 2,158,541,000 us-gaap_SalesRevenueGoodsNet | 2,189,938,000 us-gaap_SalesRevenueGoodsNet |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of property |  | 5,000,000 mli_LongLivedAssetsHeldForSaleProceedsFromSale1 |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of property | 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 |  |  |  |  |  |  |  |
Goodwill allocated to disposal group |  |  |  |  |  |  | 10,500,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease-back term |  |  |  |  |  |  | 8 months |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease-back term |  |  |  |  |  |  | 14 months |  |  |  |  |  |  |
Land and Building Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of property |  |  |  |  |  |  |  | 4,700,000 mli_LongLivedAssetsHeldForSaleProceedsFromSale1 / mli_CategoryOfAssetsDisposedAxis = mli_LandAndBuildingAssetsMember |  |  |  |  |  |
Pre-tax gain on sale of property |  |  |  |  |  |  |  | 1,400,000 us-gaap_GainLossOnDispositionOfAssets / mli_CategoryOfAssetsDisposedAxis = mli_LandAndBuildingAssetsMember |  |  |  |  |  |
Impairment charge recognized on fair value of disposed assets |  |  | 3,200,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / mli_CategoryOfAssetsDisposedAxis = mli_LandAndBuildingAssetsMember |  |  |  |  |  |  |  |  |  |  |
Manufacturing assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of assets disposed |  |  |  |  |  |  | 15,900,000 mli_DisposalGroupIncludingDiscontinuedOperationNetAssetsCurrent / mli_CategoryOfAssetsDisposedAxis = mli_ManufacturingAssetsMember |  |  |  |  |  |  |
Cash proceeds from sale of property |  |  |  |  |  |  | 61,200,000 mli_LongLivedAssetsHeldForSaleProceedsFromSale1 / mli_CategoryOfAssetsDisposedAxis = mli_ManufacturingAssetsMember |  |  |  |  |  |  |
Pre-tax gain on sale of property |  |  | 39,800,000 us-gaap_GainLossOnDispositionOfAssets / mli_CategoryOfAssetsDisposedAxis = mli_ManufacturingAssetsMember |  |  |  |  |  |  |  |  |  |  |
Total sales price of property |  |  |  |  |  |  | 66,200,000 us-gaap_PropertyPlantAndEquipmentDisposals / mli_CategoryOfAssetsDisposedAxis = mli_ManufacturingAssetsMember |  |  |  |  |  |  |
Amount of pre-diluted share after tax |  |  | $ 0.41 mli_AmountOfPreDilutedShareAfterTax / mli_CategoryOfAssetsDisposedAxis = mli_ManufacturingAssetsMember |  |  |  |  |  |  |  |  |  |  |
Mueller Primaflow Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of outstanding capital stock of Primaflow |  |  |  |  |  |  |  |  | 24,900,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_MuellerPrimaflowLimitedMember |  |  |  |  |
Net sales |  |  |  | 57,500,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_MuellerPrimaflowLimitedMember |  |  |  |  |  |  |  |  |  |
After-tax net income |  |  |  | 4,400,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_MuellerPrimaflowLimitedMember |  |  |  |  |  |  |  |  |  |
Carrying value of the assets disposed |  |  |  |  |  |  |  |  | 25,300,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_MuellerPrimaflowLimitedMember |  |  |  |  |
Fair value of the liabilities disposed |  |  |  |  |  |  |  |  | 7,100,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_MuellerPrimaflowLimitedMember |  |  |  |  |
Cumulative translation loss |  |  |  |  |  |  |  |  | (6,000,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_MuellerPrimaflowLimitedMember |  |  |  |  |
ABS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of assets disposed |  |  |  |  |  |  |  |  |  | 1,900,000 mli_DisposalGroupIncludingDiscontinuedOperationNetAssetsCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_ABSMember |  |  |  |
Cash proceeds from sale of property |  |  |  |  |  |  |  |  |  | 6,000,000 mli_LongLivedAssetsHeldForSaleProceedsFromSale1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_ABSMember |  |  |  |
Pre-tax gain on sale of property |  |  |  |  |  |  |  |  |  | 4,100,000 us-gaap_GainLossOnDispositionOfAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mli_ABSMember |  |  |  |
KME Yorkshire Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquisition |  |  |  |  |  |  |  |  |  |  | 30,100,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Pro forma net sales |  |  |  |  |  | 196,100,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  |  |  |  |  |  |  | 20,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Fair value of assets acquired - inventories |  |  |  |  |  |  |  |  |  |  | 17,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Fair value of assets acquired - property, plant and equipment |  |  |  |  |  |  |  |  |  |  | 2,100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Fair value of assets acquired -other current assets |  |  |  |  |  |  |  |  |  |  | 1,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Fair value of liabilities assumed |  |  |  |  |  |  |  |  |  |  | 15,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Fair value of liabilities assumed - accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  | 15,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Fair value of liabilities assumed - other current liabilities |  |  |  |  |  |  |  |  |  |  | 400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Remaining purchase price allocated to goodwill |  |  |  |  |  |  |  |  |  |  | 8,100,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Remaining purchase price allocated to other intangible assets |  |  |  |  |  |  |  |  |  |  | 16,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |
Severance |  |  |  | 7,300,000 us-gaap_SeveranceCosts1 / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember |  |  |  |  |  |  |  |  |  |
KME Yorkshire Limited [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected additional expenses to be incurred | 2,700,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  | 2,700,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = mli_KmeYorkshireLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |
Westemeyer Industries, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquisition |  |  |  |  |  |  |  |  |  |  |  | 11,600,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Fair value of assets acquired |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Fair value of assets acquired - inventories |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Fair value of assets acquired - receivables |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Fair value of assets acquired - property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Remaining purchase price allocated to goodwill |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Remaining purchase price allocated to other intangible assets |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Portion of outstanding stock acquired (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Fair value of assets acquired - current liabilities |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = mli_WestemeyerIndustriesIncMember |  |
Howell Metal Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquisition |  |  |  |  | 55,300,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |  |  | 55,300,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |
Fair value of assets acquired |  |  |  |  |  |  |  | 63,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Fair value of assets acquired - inventories |  |  |  |  |  |  |  | 27,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Fair value of assets acquired - receivables |  |  |  |  |  |  |  | 14,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Fair value of assets acquired - property, plant and equipment |  |  |  |  |  |  |  | 20,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Fair value of assets acquired -other current assets |  |  |  |  |  |  |  | 500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Fair value of liabilities assumed |  |  |  |  |  |  |  | 11,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Fair value of liabilities assumed - accounts payable and accrued expenses |  |  |  |  |  |  |  | 9,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Fair value of liabilities assumed - other current liabilities |  |  |  |  |  |  |  | 1,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Remaining purchase price allocated to goodwill |  |  |  |  |  |  |  | 1,300,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Remaining purchase price allocated to other intangible assets |  |  |  |  | 2,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  | 2,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember |  |  |  |  |  |
Proforma net sales |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 156,300,000 us-gaap_SalesRevenueGoodsNet / us-gaap_BusinessAcquisitionAxis = mli_HowellMetalCompanyMember

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