| Acquisitions (Consideration) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012 | 
|---|---|---|---|
| Business Acquisition [Line Items] | |||
| Goodwill | $ 5,141us-gaap_Goodwill | $ 5,221us-gaap_Goodwill | $ 4,472us-gaap_Goodwill | 
| X | ||||||||||
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- Details 
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| X | ||||||||||
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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