Accounting Policies (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Mar. 20, 2013	Jan. 03, 2014	Dec. 28, 2012	Dec. 30, 2011
Accounting Policies [Line Items]
Research and Development Arrangement, Contract to Perform for Others, Compensation Earned		$ 5,100,000	$ 32,900,000	$ 23,700,000
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Advertising expense		33,800,000
Third party funding for research and development costs			3,500,000	7,800,000
Depreciation expense		$ 26,736,000	$ 23,691,000	$ 20,509,000
Maturity period of derivative financial instrument, minimum, in months		1 month
Maturity period of derivative financial instrument, maximum, in months		3 months
Building [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		39 years
Leasehold Improvements [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Estimated Useful Lives		the life of the lease
Minimum [Member]
Accounting Policies [Line Items]
Estimated useful lives goodwill and purchased intangible assets, in years		1 month
Warranty periods for products sold		90 days
Minimum [Member] | Machinery And Equipment [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		4 years
Minimum [Member] | Furniture And Fixtures [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		5 years
Minimum [Member] | Computer Equipment And Software [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		2 years
Minimum [Member] | Internal-Use Of Software [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		2 years
Maximum [Member]
Accounting Policies [Line Items]
Estimated useful lives goodwill and purchased intangible assets, in years		12 years
Warranty periods for products sold		5 years 6 months
Maximum [Member] | Machinery And Equipment [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		6 years
Maximum [Member] | Furniture And Fixtures [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		7 years
Maximum [Member] | Computer Equipment And Software [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		5 years
Maximum [Member] | Internal-Use Of Software [Member]
Accounting Policies [Line Items]
Useful life of asset, in years		5 years
Weighted Average [Member]
Accounting Policies [Line Items]
Estimated useful lives goodwill and purchased intangible assets, in years		6 years 4 months 26 days