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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 06, 2017
Sep. 30, 2017
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Goodwill [Line Items]          
Goodwill impairment     $ 11,150,000 $ 2,876,000  
Gain on sale and license of intangible assets   $ 6,000,000      
Goodwill and Other Intangible Assets     490,892,000 511,419,000  
Goodwill     279,505,000 290,699,000 $ 277,650,000
Trade names, net value     29,201,000 $ 38,054,000  
Office furniture reporting unit one          
Goodwill [Line Items]          
Goodwill impairment $ 6,300,000   4,800,000    
Goodwill and Other Intangible Assets     0    
Goodwill     $ 19,600,000    
Office furniture reporting unit one | Trademarks and trade names          
Goodwill [Line Items]          
Intangible assets impairment 8,300,000        
Office furniture reporting unit two          
Goodwill [Line Items]          
Discount rate utilized for each reporting unit with rates range (percent)     13.50%    
Terminal growth (percent)     3.00%    
Decrease in reporting unit due to 100 basis point increase in discount rate     $ 3,300,000    
Decrease in reporting unit due to 100 basis point decrease in long-term growth rate     $ 1,400,000    
Office furniture reporting unit two | Minimum          
Goodwill [Line Items]          
Near term growth (percent)     7.00%    
Office furniture reporting unit two | Maximum          
Goodwill [Line Items]          
Near term growth (percent)     10.00%    
Customer lists and other | Office furniture reporting unit one          
Goodwill [Line Items]          
Intangible assets impairment $ 1,500,000