Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 27, 2014	Dec. 28, 2013
Consolidated Balance Sheets [Abstract]
Common Stock, No Par Value	$ 0us-gaap_CommonStockNoParValue	$ 0us-gaap_CommonStockNoParValue
Common Stock, Shares Authorized	100,800,000us-gaap_CommonStockSharesAuthorized	100,800,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares Issued	33,047,807us-gaap_CommonStockSharesIssued	33,047,807us-gaap_CommonStockSharesIssued
Common Stock, Shares Outstanding	26,898,443us-gaap_CommonStockSharesOutstanding	26,898,443us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares	6,149,364us-gaap_TreasuryStockShares	6,149,364us-gaap_TreasuryStockShares

Face amount per share of no-par value common stock.

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 210.5-02.29)

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-Name Regulation S-X (SX)

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Topic 505

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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