Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 2,574	$ 1,881	$ 1,330
Charge to Revenue/Expense	158	744	694
Write-offs	185	(51)	(143)
Balance at End of Year	$ 2,601	$ 2,574	$ 1,881