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Summary of Significant Accounting Policies(Leases) (Details) - Land and/or building
12 Months Ended
Dec. 27, 2016
Leases and Leasehold Improvements  
Lease renewal term 5 years
Minimum  
Leases and Leasehold Improvements  
Lease terms 10 years
Lease renewal option 1 year
Maximum  
Leases and Leasehold Improvements  
Lease terms 15 years