Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014		Dec. 28, 2013		Dec. 29, 2012
Allowance for Doubtful Accounts [Member]
Year ended:
Balance at beginning of year	$ 141		$ 216		$ 467
Charged to costs and expenses	402		40		276
Charged to other accounts	0		0		0
Deductions	93	[1]	115	[1]	527	[1]
Balance at end of year	450		141		216
Provision for claims, allowances and warranties [Member]
Year ended:
Balance at beginning of year	3,377		2,509		2,375
Charged to costs and expenses	9,249		7,141		5,226
Charged to other accounts	606	[2]	0		0
Deductions	8,585	[3]	6,273	[3]	5,092	[3]
Balance at end of year	$ 4,647		$ 3,377		$ 2,509

[1] Uncollectible accounts written off, net of recoveries.

[2] Assumed reserve in business combinations.

[3] Reserve reductions for claims, allowances and warranties settled.