Business and Summary of Significant Accounting Policies Warranty Liabilities (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Warranty Liabilities [Abstract]
Limited warranty period	25 years
Customer participation term	23 years
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$ 4,858,000	$ 6,310,000	$ 5,744,000
Additions charged to costs and expenses for current-year sales	4,603,000	4,114,000	4,232,000
Deductions from reserves	(6,070,000)	(5,094,000)	(4,750,000)
Changes in liability for pre-existing warranties during the current year, including expirations(1)	230,000	(472,000)	1,084,000	[1]
Acquired warranty reserve	532,000	0	0
Balance at end of period	4,153,000	4,858,000	6,310,000
Adjustment for customer-service reserves			$ 1,600,000

[1] Includes $1.6 million increase for customer-service reserves established during 2011.