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Consolidated Financial Statement Details (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Other Current Liabilities [Abstract] |  |  |
Accrued discounts and allowances | $ 45,300,000 mli_AccruedDiscountsAndAllowancesLiabilityCurrent | $ 43,200,000 mli_AccruedDiscountsAndAllowancesLiabilityCurrent |
Other Income (Expense), Net [Abstract] |  |  |
Gain on the sale of non-operating property | 0 us-gaap_GainLossOnSaleOfProperty | 3,000,000 us-gaap_GainLossOnSaleOfProperty | 0 us-gaap_GainLossOnSaleOfProperty
Interest income | 573,000 us-gaap_InvestmentIncomeInterest | 906,000 us-gaap_InvestmentIncomeInterest | 847,000 us-gaap_InvestmentIncomeInterest
Environmental expense, non-operating properties | (822,000)mli_EnvironmentalExpenseNonOperatingProperties | (823,000)mli_EnvironmentalExpenseNonOperatingProperties | (1,128,000)mli_EnvironmentalExpenseNonOperatingProperties
Other | 6,000 us-gaap_OtherNonoperatingIncome | 1,368,000 us-gaap_OtherNonoperatingIncome | 820,000 us-gaap_OtherNonoperatingIncome
Other income, net | $ (243,000)us-gaap_OtherNonoperatingIncomeExpense | $ 4,451,000 us-gaap_OtherNonoperatingIncomeExpense | $ 539,000 us-gaap_OtherNonoperatingIncomeExpense

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- Definition Amount of gain (loss) on sale or disposal of oil and gas property or timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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