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Segment Information Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 29, 2017
USD ($)
segment
Dec. 30, 2016
USD ($)
Jan. 01, 2016
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 1    
Gain (loss) on foreign exchange | $ $ (0.2) $ (0.2) $ 0.1