Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2012	Dec. 30, 2011
Income Tax Disclosure [Abstract]
Purchased intangibles	$ 170,271	$ 138,948
Depreciation and amortization	8,712	12,373
US residual tax on foreign earnings	973	0
Other	631	0
Total deferred tax liabilities	180,587	151,321
Inventory valuation differences	10,917	9,988
Expenses not currently deductible	27,107	25,738
Deferred revenue	2,838	4,901
US State credit carryforwards	13,495	12,789
Warranty	3,135	3,973
US Federal net operating loss carryforward	5,951	11,460
Foreign net operating loss carryforward	25,828	30,752
Net foreign tax credits on undistributed foreign earnings	0	8,589
Stock-based compensation	13,000	15,041
Other	516	3,447
Total deferred tax assets	102,787	126,678
Valuation allowance	(22,144)	(20,432)
Total deferred tax assets	80,643	106,246
Total net deferred tax assets /(liabilities)	(99,944)	(45,075)
Current deferred income tax assets	43,473	44,632
Non-current deferred income tax assets	4,927	6,062
Current deferred income tax liabilities	(84)	(175)
Non-current deferred income tax liabilities	$ (148,260)	$ (95,594)