Defined Contribution Benefit Plan Defined Contribution Benefit Plan (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 25, 2012	Dec. 27, 2011	Dec. 28, 2010
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Company Match (as a percent)	50.00%
Match Limit for Employee Pay (as a percent)	3.00%
Vesting Percentage (as a percent)	25.00%
Defined Contribution Vesting Period (in years)	5 years
Defined Benefit Plan, Contributions by Employer	$ 1.8	$ 1.6	$ 1.4

The increase in the fair value of plan assets from contributions made by the employer.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration