Business and Summary of Significant Accounting Policies - Warranty Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Warranty Liabilities [Roll Forward]
Balance at beginning of period	$ 11,345	$ 10,389	$ 9,320
Additions charged to costs and expenses for current-year sales	13,387	10,949	12,385
Deductions from reserves	(12,158)	(11,007)	(11,743)
Change in liabilities for pre-existing warranties during the current    year, including expirations	(422)	1,014	427
Balance at end of period	$ 12,152	$ 11,345	$ 10,389