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Summary of Significant Accounting Policies (Details 6)
 12 Months Ended
Dec. 27, 2011
y
Leases and Leasehold Improvements  
Lease renewal term (in years) 5
Land and building | Minimum
  
Leases and Leasehold Improvements  
Lease terms (in years) 10
Lease renewal term (in years) 1
Land and building | Maximum
  
Leases and Leasehold Improvements  
Lease terms (in years) 15