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Inventories (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Dec. 27, 2014 | Dec. 28, 2013
Inventories [Abstract] |  |  |  |
Raw materials and supplies |  |  | $ 53,586,000 us-gaap_InventoryRawMaterialsAndSupplies | $ 54,613,000 us-gaap_InventoryRawMaterialsAndSupplies
Work-in-process |  |  | 39,707,000 us-gaap_InventoryWorkInProcess | 43,796,000 us-gaap_InventoryWorkInProcess
Finished goods |  |  | 168,481,000 us-gaap_InventoryFinishedGoods | 159,422,000 us-gaap_InventoryFinishedGoods
Valuation reserves |  |  | (5,189,000)us-gaap_InventoryAdjustments | (6,115,000)us-gaap_InventoryAdjustments
Inventories |  |  | 256,585,000 us-gaap_InventoryNet | 251,716,000 us-gaap_InventoryNet
Inventories valued using the LIFO method |  |  | 25,900,000 us-gaap_LIFOInventoryAmount | 34,900,000 us-gaap_LIFOInventoryAmount
FIFO cost of inventories |  |  | 104,800,000 us-gaap_FIFOInventoryAmount | 117,900,000 us-gaap_FIFOInventoryAmount
Average cost basis inventories |  |  | 47,700,000 us-gaap_WeightedAverageCostInventoryAmount | 54,700,000 us-gaap_WeightedAverageCostInventoryAmount
Deferred LIFO Gain |  | 8,000,000 mli_DeferredLifoGain |  |
Effect of liquidation of LIFO layers on cost of sales | 8,000,000 us-gaap_InventoryLIFOReserveEffectOnIncomeNet |  |  |
Effect of liquidation of LIFO layers per diluted share after tax (in dollars per share) | $ 0.7 mli_EffectOfLiquidationOfLifoLayersPerDilutedShareAfterTax |  |  |
FIFO value of inventory consigned to others |  |  | $ 4,300,000 mli_FifoValueOfInventoryConsignedToOthers | $ 4,300,000 mli_FifoValueOfInventoryConsignedToOthers

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- Definition The LIFO Gain recognized in the current period which was deferred because it resulted from intercompany sales. + References No definition available. + Details
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- Definition Effect of liquidation of LIFO layers per diluted share after tax. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of FIFO value inventory owned by the entity but in the hands of a customer, typically a reseller. + References No definition available. + Details
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- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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- Definition Certain changes made in the current period to the value and amount of inventory reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph b -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360613&loc=d3e4492-108314 + Details
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- Details
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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The difference between the change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods and any LIFO decrement which have been reflected in the statement of income during the period. + References No definition available. + Details
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(4),(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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- Definition The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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