Purchase of Comfortaire (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended		12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Jan. 17, 2013 Comfortaire Corporation [Member]	Dec. 29, 2012 Comfortaire Corporation [Member]	Dec. 28, 2013 Comfortaire Corporation [Member]	Dec. 28, 2013 Developed Technology Rights [Member] Comfortaire Corporation [Member]	Dec. 28, 2013 Customer Lists [Member] Comfortaire Corporation [Member]	Dec. 28, 2013 Trademarks and Trade Names [Member] Comfortaire Corporation [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 15,500,000	$ 0	$ 0	$ 15,500,000
Acquired Goodwill and Intangible Assets - Tax Deductibility Period (in years)				15 years
Acquired Intangible Assets - Estimated Useful Life							10 years	7 years
Finite-lived Intangible Assets Acquired							4,829,000	2,413,000
Indefinite-lived Intangible Assets Acquired	1,396,000	0							1,396,000
Assets Acquired - Accounts Receivables				365,000
Assets Acquired - Inventory				678,000
Assets Acquired - Other, Current				248,000
Assets Acquired - Property, Plant, and Equipment				513,000
Assets Acquired - Goodwill	8,963,000	2,850,000	2,850,000	6,113,000
Assets Acquired - Intangible Assets				8,638,000		8,638,000
Assets Acquired - Total Assets				16,555,000
Liabilities Acquired - Accounts Payable				404,000
Liabilities Acquired - Warranty				532,000
Liabilities Acquired - Other, Current				119,000
Liabilities Acquired - Total Liabilities				1,055,000
Net Assets Acquired				15,500,000
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period					$ 10,500,000