Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Income Tax Disclosure [Abstract]
Federal statutory tax expense	$ 55,020	$ 36,836	$ 33,957
State taxes, net of federal tax effect	4,269	4,118	2,469
Credit for increasing research activities	(3,320)	(2,569)	(1,338)
Deduction related to domestic production activities	(3,320)	(1,751)	(1,396)
Valuation allowance	0	2,474	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	0	4,298	0
Uncertain tax positions	(1,344)	1,099	773
Other - net	459	(729)	(1,127)
Total income tax expense	$ 51,764	$ 43,776	$ 33,338