Reportable Segment Information (Net Sales By Product Category) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Revenue from External Customer [Line Items]
Net sales	$ 596,866	$ 615,850	$ 568,226	$ 523,477	$ 646,661	$ 614,690	$ 509,143	$ 452,201	$ 2,304,419	$ 2,222,695	$ 2,059,964
Systems and Storage [Member]
Revenue from External Customer [Line Items]
Net sales									1,140,369	1,156,170	1,132,885
Seating [Member]
Revenue from External Customer [Line Items]
Net sales									561,392	498,389	469,220
Other [Member]
Revenue from External Customer [Line Items]
Net sales									76,043	84,490	83,100
Hearth Products [Member]
Revenue from External Customer [Line Items]
Net sales									$ 526,615	$ 483,646	$ 374,759