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Closed Restaurant Reserve (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 01, 2013
Jan. 03, 2012
Restructuring Reserve [Roll Forward]    
Closed restaurant reserves, beginning of period $ 515 $ 577
Additions—store closing costs incurred, accretion 483 140
Decreases—payments (210) (202)
Closed restaurant reserves, end of period $ 788 $ 515