Reportable Segment Information (Net Sales By Product Category) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Revenue from External Customer [Line Items]
Net sales	$ 2,203,489	$ 2,304,419	$ 2,222,695
Systems and storage
Revenue from External Customer [Line Items]
Net sales	904,748	1,140,369	1,156,170
Seating
Revenue from External Customer [Line Items]
Net sales	707,609	561,392	498,389
Other
Revenue from External Customer [Line Items]
Net sales	91,528	76,043	84,490
Hearth Products
Revenue from External Customer [Line Items]
Net sales	$ 499,604	$ 526,615	$ 483,646