Goodwill and Intangible Assets Amortization Expense and Future Amortization Expense (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Acquired Definite-Lived Intangible Asset			$ 1,396,000	$ 0
2014	800,000		800,000
2015	800,000		800,000
2016	800,000		800,000
2017	800,000		800,000
2018	800,000		800,000
Amortization of Intangible Assets	300,000	5,000	400,000	9,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			17 years
Developed Technology Rights [Member] | Comfortaire Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Definite-Lived Intangible Asset			4,829,000
Customer Lists [Member] | Comfortaire Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Definite-Lived Intangible Asset			$ 2,413,000