Inventories (Details) (USD $)	Dec. 27, 2013	Dec. 28, 2012
Inventories [Abstract]
Finished products and components	$ 65,963,000	$ 58,703,000
Products and components in various stages of completion	41,458,000	44,001,000
Raw materials and purchased components	69,051,000	59,190,000
Inventory gross total	176,472,000	161,894,000
Reduction to LIFO cost	(42,685,000)	(40,345,000)
Total	133,787,000	121,549,000
Inventories valued under the LIFO method	$ 76,900,000	$ 72,600,000

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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

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-SubTopic 10

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-Subparagraph (SX 210.5-02.6(a)(1))

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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