Change In Accounting Principle (Schedule Of Condensed Consolidated Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Change in Accounting Principle [Line Items]
Net income	$ 33,564	$ 96,844
Less: Income from discontinued operations		1,703
Less: Gain on disposal of discontinued operations		25,203
Income from continuing operations	33,564	69,938
Depreciation	12,288	13,057
Amortization	21,815	10,355
Stock-based compensation	10,766	7,464
Provision for excess and obsolete inventory	1,574	4,627
Other	(454)	618
Accounts receivable	(92,217)	(17,498)
Inventories	23,636	(10,709)
Other assets		(2,266)
Deferred revenue and customer advances	(1,704)	(24,553)
Accounts payable and other accrued expenses	(9,635)	(26,014)
Retirement plan contributions	(1,061)	(1,176)
Net cash provided by continuing operations	11,169	23,843
Net cash used for discontinued operations		(4,225)
Net cash provided by operating activities	11,169	19,618
Net cash used for investing activities	(54,364)	(5,942)
Net cash provided by financing activities	2,855	8,854
(Decrease) Increase in cash and cash equivalents	(40,340)	22,530
Cash and cash equivalents at beginning of period	573,736	397,737
Cash and cash equivalents at end of period	533,396	420,267
Originally Reported [Member]
Change in Accounting Principle [Line Items]
Net income		94,872
Less: Income from discontinued operations		1,545
Less: Gain on disposal of discontinued operations		25,203
Income from continuing operations		68,124
Depreciation		13,057
Amortization		12,442
Stock-based compensation		7,464
Provision for excess and obsolete inventory		4,627
Other		618
Accounts receivable		(17,498)
Inventories		(10,709)
Other assets		(2,539)
Deferred revenue and customer advances		(24,553)
Accounts payable and other accrued expenses		(26,014)
Retirement plan contributions		(1,176)
Net cash provided by continuing operations		23,843
Net cash used for discontinued operations		(4,225)
Net cash provided by operating activities		19,618
Net cash used for investing activities		(5,942)
Net cash provided by financing activities		8,854
(Decrease) Increase in cash and cash equivalents		22,530
Cash and cash equivalents at beginning of period		397,737
Cash and cash equivalents at end of period		420,267
Effect Of Accounting Change [Member]
Change in Accounting Principle [Line Items]
Net income		1,972
Less: Income from discontinued operations		158
Income from continuing operations		1,814
Amortization		(2,087)
Other assets		273
As Adjusted [Member]
Change in Accounting Principle [Line Items]
Net income		96,844
Less: Income from discontinued operations		1,703
Less: Gain on disposal of discontinued operations		25,203
Income from continuing operations		$ 69,938