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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Feb. 28, 2014
Dec. 29, 2012
Mar. 30, 2015
Mar. 31, 2015
Mar. 28, 2015
KME Yorkshire Limited [Member]          
Business Acquisition [Line Items]          
Cost of acquisition $ 30.1us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Pro forma net sales   196.1us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
     
Fair value of assets acquired 20.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Fair value of assets acquired - inventories 17.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Fair value of assets acquired - property, plant and equipment 2.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Fair value of assets acquired - other current assets 1.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Fair value of liabilities assumed 15.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Fair value of liabilities assumed - accounts payable and accrued expenses 15.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Fair value of liabilities assumed - other current liabilities 0.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Remaining purchase price allocated to goodwill 8.1us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Remaining purchase price allocated to other intangible assets 16.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
       
Expected additional expenses to be incurred         2.7us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= mli_KmeYorkshireLimitedMember
Turbotec Products, Inc. [Member] | Subsequent Event [Member]          
Business Acquisition [Line Items]          
Cost of acquisition     14.2us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mli_TurbotecProductsIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Pro forma net sales       $ 21.8us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= mli_TurbotecProductsIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember