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Industry Segments (Details) (USD $) | 3 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014
Industry Segments [Abstract] |  |
Decrease in accruals related to import duties included in cost of goods sold |  | $ 3,100,000 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Summary of segment information [Abstract] |  |
Net sales | 537,242,000 us-gaap_SalesRevenueGoodsNet | 574,374,000 us-gaap_SalesRevenueGoodsNet
Cost of goods sold | 460,834,000 us-gaap_CostOfGoodsSold | 495,777,000 us-gaap_CostOfGoodsSold
Depreciation and amortization | 7,853,000 us-gaap_OtherDepreciationAndAmortization | 8,107,000 us-gaap_OtherDepreciationAndAmortization
Selling, general, and administrative expense | 32,831,000 us-gaap_SellingGeneralAndAdministrativeExpense | 32,183,000 us-gaap_SellingGeneralAndAdministrativeExpense
Operating income | 35,724,000 us-gaap_OperatingIncomeLoss | 38,307,000 us-gaap_OperatingIncomeLoss
Interest expense | (2,076,000)us-gaap_InterestExpense | (1,026,000)us-gaap_InterestExpense
Other income, net | 105,000 us-gaap_OtherNonoperatingIncomeExpense | 88,000 us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes | 33,753,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 37,369,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Corporate and Eliminations [Member] |  |
Summary of segment information [Abstract] |  |
Net sales | (3,092,000)us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (3,683,000)us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Cost of goods sold | (3,062,000)us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (3,651,000)us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Depreciation and amortization | 475,000 us-gaap_OtherDepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 604,000 us-gaap_OtherDepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Selling, general, and administrative expense | 5,810,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 6,228,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Operating income | (6,315,000)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (6,864,000)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Plumbing and Refrigeration Segment [Member] | Operating Segments [Member] |  |
Summary of segment information [Abstract] |  |
Net sales | 305,017,000 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember | 338,027,000 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember
Cost of goods sold | 260,463,000 us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember | 289,025,000 us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember
Depreciation and amortization | 4,523,000 us-gaap_OtherDepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember | 4,420,000 us-gaap_OtherDepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember
Selling, general, and administrative expense | 20,540,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember | 20,697,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember
Operating income | 19,491,000 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember | 23,885,000 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_PlumbingAndRefrigerationSegmentMember
OEM Segment [Member] | Operating Segments [Member] |  |
Summary of segment information [Abstract] |  |
Net sales | 235,317,000 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember | 240,030,000 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember
Cost of goods sold | 203,433,000 us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember | 210,403,000 us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember
Depreciation and amortization | 2,855,000 us-gaap_OtherDepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember | 3,083,000 us-gaap_OtherDepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember
Selling, general, and administrative expense | 6,481,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember | 5,258,000 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember
Operating income | $ 22,548,000 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember | $ 21,286,000 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mli_OemSegmentMember

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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