Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Tax Disclosure [Abstract]
Federal statutory tax expense	$ 11,420	$ 29,970	$ 24,943
State taxes, net of federal tax effect	2,387	5,159	3,997
Credit for increasing research activities	(3,891)	(4,050)	(3,950)
Valuation allowance	1,264	98	(1,141)
Goodwill impairment	1,453	0	0
Equity based compensation	106	639	(666)
Change in uncertain tax positions	(335)	(357)	766
Foreign income tax rate differential	(44)	596	124
Other – net	106	156	1,326
Total income tax expense	$ 12,466	$ 32,211	$ 25,399