Purchase of Comfortaire Purchase Price Allocation (Details) (USD $)	6 Months Ended				0 Months Ended	12 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Dec. 29, 2012	Dec. 31, 2011	Jan. 17, 2013 Comfortaire Corporation [Member]	Dec. 29, 2012 Comfortaire Corporation [Member]	Jun. 29, 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							219,000
Property and equipment							509,000
Goodwill	9,007,000	2,850,000	2,850,000	2,850,000			6,157,000
Intangible assets							8,638,000
Goodwill							16,566,000
Accounts payable							344,000
Warranty liabilities							658,000
Other liabilities							64,000
Total liabilities acquired							1,066,000
Net assets acquired							$ 15,500,000
Tax Deductibel Period Acquired Goodwill and Intangible Assets					15 years