Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 3,540	$ 3,493	$ 3,780
Charged to costs and expenses	881	1,848	635
Charged to other accounts	0	0	0
Deductions (describe)	628	1,801	922
Balance at end of year	3,793	3,540	3,493
Restructuring Reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	11,907	2,568	10,291
Charged to costs and expenses	7,944	11,961	3,999
Charged to other accounts	49	8,569	3,300
Deductions (describe)	8,357	2,622	3,724
Balance at end of year	11,445	11,907	2,568
Warranty and Sales Allowances Reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	3,495	4,111	5,529
Charged to costs and expenses	1,519	1,074	2,071
Charged to other accounts	0	0	0
Deductions (describe)	1,161	1,690	3,489
Balance at end of year	$ 3,853	$ 3,495	$ 4,111