Schedule II - Valuation And Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of year	$ 1,036	$ 1,614	$ 1,952
Charged (credited) to expenses or other accounts	(259)	(558)	(19)
Recoveries (Write-offs), net	18	(20)	(319)
Balance at end of year	$ 795	$ 1,036	$ 1,614