Commitments and Contingencies Sales Return Liability (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Sales return liability [Roll Forward]
Balance at beginning of year	$ 9,433	$ 5,330
Additions that reduce net sales	19,021	12,963
Deductions from reserves	(17,717)	(13,230)
Acquired sales return reserve(1)	0	50	[1]
Balance at end of period	$ 10,737	$ 5,113

[1] Acquired sales return reserve resulted from the acquisition of Comfortaire Corporation in the first quarter of fiscal 2013.