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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 28, 2015
Feb. 18, 2015
Jun. 21, 2011
Loss Contingencies [Line Items]      
Term of guarantees 1 year    
Payments required to be made under guarantees, maximum $ 10.2us-gaap_GuaranteeObligationsMaximumExposure    
United States Department of Commerce Antidumping Review [Member]      
Loss Contingencies [Line Items]      
Assignment of antidumping duty rate on U.S. imports by Company subsidiaries (in hundredths)   13.70%mli_AssignmentOfAntidumpingDutyRateOnUSImportsByCompanySubsidiaries
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_UnfavorableRegulatoryActionMember		 19.80%mli_AssignmentOfAntidumpingDutyRateOnUSImportsByCompanySubsidiaries
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_UnfavorableRegulatoryActionMember
Reserve for Antidumping Duties $ 1.1us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_UnfavorableRegulatoryActionMember