Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Accounting Policies [Line Items]
Maturity period of derivative financial instrument, minimum, in months	1 month
Maturity period of derivative financial instrument, maximum, in months	2 months
Depreciation expense	$ 36,700,000	$ 33,100,000	$ 26,700,000
Advertising expense	32,300,000	39,000,000	33,800,000
Research and Development expense with third party funding earned	12,500,000	13,500,000	$ 5,100,000
Unamortized Debt Issuance Expense	2,700,000	3,000,000
Deferred Tax Liabilities, Net, Current	$ 0	900,000
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
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	131.00%
Warranty periods for products sold	1 year
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
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	701.00%
Warranty periods for products sold	2 years
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 2 months 26 days
Scenario, Previously Reported [Member] | Other Current Assets [Member]
Accounting Policies [Line Items]
Unamortized Debt Issuance Expense		300,000
Scenario, Previously Reported [Member] | Other Noncurrent Assets [Member]
Accounting Policies [Line Items]
Unamortized Debt Issuance Expense		2,700,000
Forward Contracts [Member]
Accounting Policies [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 0	0
Indemnification Agreement [Member]
Accounting Policies [Line Items]
Loss Contingency Accrual	$ 0	$ 0