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Segment Information - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jan. 03, 2016
USD ($)
Segment
Store
Dec. 28, 2014
USD ($)
Store
Segment Reporting [Abstract]    
Number of reportable segments | Segment 3  
Reduction of goodwill related to sale of stores | $ $ 0.2 $ 0.5
Increase in goodwill from store purchase | $   $ 0.2
Number of stores sold during period | Store 4 14
Number of stores purchased from franchisee | Store   1