Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance, beginning of year	$ 200	$ 81	$ 71
Additions (reductions) not charged to expense	(20)	174	(4)	[1]
Additions (reduction) charged (credited) to expense	(109)	6	13
Deductions/write-offs	31	61	(1)
Balance, end of year	40	200	81
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance, beginning of year	17,362	21,485	26,653
Additions (reductions) not charged to expense	(300)	(1,165)	1,789	[2]
Additions (reduction) charged (credited) to expense	10,783	1,148	1,125
Deductions/write-offs	3,907	4,106	8,082
Balance, end of year	$ 23,938	$ 17,362	$ 21,485

[1] Changes in reserve balances resulting from foreign currency impact.

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