Summary of Significant Accounting Policies (Details 6)	12 Months Ended
	Dec. 25, 2012
Leases and Leasehold Improvements
Lease renewal term	5 years
Land and building | Minimum
Leases and Leasehold Improvements
Lease terms	10 years
Lease renewal term	1 year
Land and building | Maximum
Leases and Leasehold Improvements
Lease terms	15 years