Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013		Dec. 29, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	$ 7,746		$ 504
Finite-Lived Intangible Assets, Accumulated Amortization	597		472
Developed technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	5,231	[1]	402
Finite-Lived Intangible Assets, Accumulated Amortization	446		371
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	2,413	[1]	0
Finite-Lived Intangible Assets, Accumulated Amortization	50		0
TradenameAndTrademark [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	102		102
Finite-Lived Intangible Assets, Accumulated Amortization	$ 101		$ 101

[1] During the three months ended March 30, 2013, in connection with the purchase of the business and assets of Comfortaire, we acquired definite-lived intangible assets, including developed technologies of $4.8 million and customer relationships of $2.4 million.