Income Taxes (Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	35.00%	35.00%	35.00%
State and local taxes, net of federal benefit	2.50%	1.90%	3.20%
Research and development tax credits	(3.30%)	(4.50%)	(2.40%)
Investment tax credits	(1.90%)	(2.40%)	(3.40%)
Qualified production activity deduction	(2.00%)	(1.70%)	(1.90%)
Foreign rate differential	(3.70%)	(3.40%)	(2.60%)
Net accruals (reversals) for unrecognized tax benefits	(1.40%)	(5.40%)	0.70%
Other	(1.60%)	(1.80%)	0.10%
Effective income tax rate	23.60%	17.70%	28.70%