Commitments and Contingencies Sales Return Liability (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Sales return liability [Roll Forward]
Balance at beginning of year	$ 9,433	$ 5,330
Additions that reduce net sales	32,923	23,388
Deductions from reserves	(33,162)	(22,963)
Acquired sales return reserve(1)	0	50	[1]
Balance at end of period	$ 9,194	$ 5,805

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