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Income Taxes (Details) (USD $) | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Income Taxes [Abstract] |  |  |
Domestic | $ 135,445,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 262,220,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 105,945,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign | 12,568,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 9,178,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 14,409,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes | 148,013,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 271,398,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 120,354,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Current tax expense [Abstract] |  |  |
Federal | 45,723,000 us-gaap_CurrentFederalTaxExpenseBenefit | 69,565,000 us-gaap_CurrentFederalTaxExpenseBenefit | 33,152,000 us-gaap_CurrentFederalTaxExpenseBenefit
Foreign | 2,346,000 us-gaap_CurrentForeignTaxExpenseBenefit | 2,608,000 us-gaap_CurrentForeignTaxExpenseBenefit | 1,764,000 us-gaap_CurrentForeignTaxExpenseBenefit
State and local | 3,905,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 6,723,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 3,049,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current tax expense | 51,974,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 78,896,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 37,965,000 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax (benefit) expense [Abstract] |  |  |
Federal | (2,469,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 17,694,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 570,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign | 890,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (376,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (2,015,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local | (4,916,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,895,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 161,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax (benefit) expense | (6,495,000)us-gaap_DeferredIncomeTaxExpenseBenefit | 19,213,000 us-gaap_DeferredIncomeTaxExpenseBenefit | (1,284,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense | 45,479,000 us-gaap_IncomeTaxExpenseBenefit | 98,109,000 us-gaap_IncomeTaxExpenseBenefit | 36,681,000 us-gaap_IncomeTaxExpenseBenefit
Undistributed earnings of foreign subsidiaries | 75,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Income Tax Reconciliation [Abstract] |  |  |
Expected income tax expense | 51,805,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 94,989,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 42,124,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income tax, net of federal benefit | 3,355,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 6,405,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 3,178,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Effect of foreign statutory rate different from U.S. and other foreign adjustments | (1,094,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (1,026,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (2,637,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Valuation allowance changes | (5,732,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (1,224,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
U.S. production activities deduction | (4,025,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (4,445,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (2,975,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Goodwill disposition | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 1,790,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Tax contingency changes | 0 us-gaap_IncomeTaxReconciliationTaxContingencies | (140,000)us-gaap_IncomeTaxReconciliationTaxContingencies | (3,224,000)us-gaap_IncomeTaxReconciliationTaxContingencies
Other, net | 1,170,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 536,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 1,439,000 us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense | 45,479,000 us-gaap_IncomeTaxExpenseBenefit | 98,109,000 us-gaap_IncomeTaxExpenseBenefit | 36,681,000 us-gaap_IncomeTaxExpenseBenefit
Unrecognized Tax Benefits Reconciliation [Roll Forward] |  |  |
Beginning balance | 2,828,000 us-gaap_UnrecognizedTaxBenefits | 3,259,000 us-gaap_UnrecognizedTaxBenefits |
Increases related to prior year tax positions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Increases related to current year tax positions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |
Decreases related to prior year tax positions | (2,828,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |
Decreases related to settlements with taxing authorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (431,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |
Decreases due to lapses in the statute of limitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |
Ending balance | 0 us-gaap_UnrecognizedTaxBenefits | 2,828,000 us-gaap_UnrecognizedTaxBenefits | 3,259,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate | 0 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Deferred tax assets [Abstract] |  |  |
Inventories | 12,815,000 us-gaap_DeferredTaxAssetsInventory | 11,136,000 us-gaap_DeferredTaxAssetsInventory |
Other postretirement benefits and accrued items | 14,550,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 13,548,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits |
Pension | 4,792,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions |
Other reserves | 10,262,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 12,931,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther |
Federal and foreign tax attributes | 6,451,000 mli_DeferredTaxAssetTaxCreditFederalAndForeign | 5,913,000 mli_DeferredTaxAssetTaxCreditFederalAndForeign |
State tax attributes, net of federal benefit | 22,928,000 mli_DeferredTaxAssetTaxCreditStateAndLocal | 24,663,000 mli_DeferredTaxAssetTaxCreditStateAndLocal |
Share-based compensation | 3,016,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 2,486,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
Total deferred tax assets | 74,814,000 us-gaap_DeferredTaxAssetsGross | 70,677,000 us-gaap_DeferredTaxAssetsGross |
Less valuation allowance | (17,119,000)us-gaap_DeferredTaxAssetsValuationAllowance | (22,544,000)us-gaap_DeferredTaxAssetsValuationAllowance |
Deferred tax assets, net of valuation allowance | 57,695,000 us-gaap_DeferredTaxAssetsNet | 48,133,000 us-gaap_DeferredTaxAssetsNet |
Deferred tax liabilities [Abstract] |  |  |
Property, plant, and equipment | 57,089,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 60,425,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Pension | 0 mli_DeferredTaxLiabilitiesPensionExpenses | 4,507,000 mli_DeferredTaxLiabilitiesPensionExpenses |
Other | 1,721,000 us-gaap_DeferredTaxLiabilitiesOther | 2,209,000 us-gaap_DeferredTaxLiabilitiesOther |
Total deferred tax liabilities | 58,810,000 us-gaap_DeferredTaxLiabilities | 67,141,000 us-gaap_DeferredTaxLiabilities |
Net deferred tax liability | (1,115,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | (19,008,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |
State income tax credit carryforwards with expiration | 4,100,000 mli_StateIncomeTaxCreditCarryforwards |  |
Other state income tax credit carryforwards with unlimited life | 11,100,000 mli_OtherTaxCarryforwardNetAmount |  |
State net operating loss carryforwards with potential tax benefits | 7,800,000 us-gaap_OperatingLossCarryforwards |  |
Valuation allowances | 11,800,000 mli_StateTaxCreditsAndNetOperatingCarryforwardsOffsetByValuationAllowances |  |
Federal and foreign tax attributes with potential tax benefits | 6,400,000 mli_FederalAndForeignTaxAttributesWithPotentialTaxBenefits |  |
Federal and foreign tax attributes with potential tax benefits with unlimited life | 4,500,000 mli_FederalAndForeignTaxAttributesWithPotentialTaxBenefitsWithUnlimitedLife |  |
Federal and foreign tax attributes with potential tax benefits with expiration | 1,900,000 mli_FederalAndForeignTaxAttributesWithPotentialTaxBenefitsThatCanExpire |  |
Valuation allowances | 3,400,000 mli_FederalAndForeignTaxAttributesOffsetByValuationAllowances |  |
Additional valuation allowance per diluted share, State tax attributes (in dollars per share) | $ 0.10 mli_AdditionalValuationAllowancePerDilutedShareStateTaxAttributes |  | $ 0.02 mli_AdditionalValuationAllowancePerDilutedShareStateTaxAttributes
Income taxes paid | $ 47,300,000 us-gaap_IncomeTaxesPaid | $ 80,100,000 us-gaap_IncomeTaxesPaid | $ 38,400,000 us-gaap_IncomeTaxesPaid

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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