Purchase of Comfortaire Purchase Price Allocation (Details) (USD $)	9 Months Ended				0 Months Ended	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Dec. 29, 2012	Dec. 31, 2011	Jan. 17, 2013 Comfortaire Corporation [Member]	Dec. 29, 2012 Comfortaire Corporation [Member]	Sep. 28, 2013 Comfortaire Corporation [Member]
Business Acquisition [Line Items]
Cash paid for Comfortaire	$ 15,500,000	$ 0			$ 15,500,000
Net Sales						10,500,000
Business Acquisition, Purchase Price Allocation [Abstract]
Accounts receivable					365,000
Inventories					678,000
Other assets					248,000
Property and equipment					513,000
Goodwill	8,963,000	2,850,000	2,850,000	2,850,000	6,113,000
Intangible assets					8,638,000		8,638,000
Goodwill					16,555,000
Accounts payable					404,000
Warranty liabilities					532,000
Other liabilities					119,000
Total liabilities acquired					1,055,000
Net assets acquired					$ 15,500,000
Tax Deductible Period Acquired Goodwill and Intangible Assets					15 years