Schedule II - Valuation and Qualifying Accounts and Reserves - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
BALANCE		$ 3,540	$ 3,493	$ 3,780	$ 4,479
CHARGED TO COSTS AND EXPENSES	[1]	1,848	635	(243)
CHARGED TO OTHER ACCOUNTS		0	0	0
DEDUCTIONS	[2]	1,801	922	456
SEC Schedule, 12-09, Reserve, Business Restructuring [Member]
BALANCE		11,907	2,568	10,291	104
CHARGED TO COSTS AND EXPENSES	[3]	11,961	3,999	11,769
CHARGED TO OTHER ACCOUNTS	[4]	8,569	3,300	8,019
DEDUCTIONS	[5]	2,622	3,724	1,582
SEC Schedule, 12-09, Reserve, Warranty [Member]
BALANCE		3,495	4,111	5,529	$ 4,759
CHARGED TO COSTS AND EXPENSES	[3]	1,074	2,071	3,149
CHARGED TO OTHER ACCOUNTS		0	0	0
DEDUCTIONS	[6]	$ 1,690	$ 3,489	$ 2,379

[1] Includes changes in foreign currency exchange rates as well as the nora reserves since the acquisition date.

[2] Write off of bad debt, and recovering of previously provided for amounts.

[3] Includes changes in foreign currency exchange rates as well as the nora reserves since the acquisition date.

[4] Direct reduction of asset carrying value, not included in restructuring reserve.

[5] Cash payments.

[6] Represents credits and costs applied against reserve and adjustments to reflect actual exposure.