Valuation And Qualifying Accounts (Detail) - Allowance for Doubtful Accounts Receivable [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year		$ 1,879	$ 1,424	$ 2,342
Provision (Benefit)		1,195	903	(88)
Additions and Deductions from Reserves	[1]	(218)	(448)	(830)
Balance End of Year		$ 2,856	$ 1,879	$ 1,424

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