Valuation And Qualifying Accounts (Detail) - Allowance for Doubtful Accounts Receivable [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year		$ 1,424	$ 2,342	$ 2,662
Provision (Benefit)		903	(88)	(51)
Additions and Deductions from Reserves	[1]	(448)	(830)	(269)
Balance End of Year		$ 1,879	$ 1,424	$ 2,342

[1] Consists primarily of write-offs, recoveries of bad debt and certain reclassifications.