Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance, beginning of year		$ 40	$ 200	$ 81
Additions (reductions) not charged to expense	[1]	24	(20)	174
Additions (reduction) charged (credited) to expense		(28)	(109)	6
Deductions/write-offs		27	31	61
Balance, end of year		9	40	200
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance, beginning of year		23,938	17,362	21,485
Additions (reductions) not charged to expense	[1]	1,285	(300)	(1,165)
Additions (reduction) charged (credited) to expense		4,792	10,783	1,148
Deductions/write-offs		9,057	3,907	4,106
Balance, end of year		$ 20,958	$ 23,938	$ 17,362

[1] Changes in reserve balances resulting from foreign currency impact and reclassifications from other reserves.