Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 03, 2014	Dec. 28, 2012
Income Tax Disclosure [Abstract]
Purchased intangibles	$ 152,437	$ 171,238
Depreciation and amortization	9,008	8,712
US residual tax on foreign earnings	10,464	973
Other	458	631
Total deferred tax liabilities	172,367	181,554
Inventory valuation differences	8,792	10,917
Expenses not currently deductible	25,086	27,107
Deferred revenue	2,884	2,838
US State credit carryforwards	14,125	13,495
Warranty	3,142	3,135
US Federal net operating loss carryforward	3,660	5,951
Foreign net operating loss carryforward	35,388	25,053
Stock-based compensation	15,704	13,000
Other	2,665	2,251
Total deferred tax assets	111,446	103,747
Valuation allowance	(31,944)	(22,137)
Total deferred tax assets	79,502	81,610
Total net deferred tax assets /(liabilities)	(92,865)	(99,944)
Current deferred income tax assets	38,597	43,473
Non-current deferred income tax assets	5,553	4,927
Current deferred income tax liabilities	(616)	(84)
Non-current deferred income tax liabilities	$ (136,399)	$ (148,260)