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Inventories (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Dec. 27, 2014
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Inventories [Abstract] |  |
Raw materials and supplies | $ 58,987 | $ 53,586
Work-in-process | 25,161 | 39,707
Finished goods | 161,410 | 168,481
Valuation reserves | (6,180) | (5,189)
Inventories | 239,378 | 256,585
Inventories valued using the LIFO method | 27,600 | 25,900
FIFO cost of inventories | 80,700 | 104,800
Average cost basis inventories | 48,800 | 47,700
FIFO value of inventory consigned to others | $ 3,700 | $ 4,300

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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 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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