Schedule of Condensed Consolidated Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011
Change In Accounting Principle
Net income	$ 233,592	$ 240,802
Less: Income from discontinued operations		1,703
Less: Gain on disposal of discontinued operations		24,371
Income from continuing operations	233,592	214,728
Depreciation	39,812	38,426
Amortization	65,790	30,838
Stock-based compensation	30,634	22,514
Provision for excess and obsolete inventory	16,408	10,756
Other	(750)	2,328
Accounts receivable	(76,134)	25,233
Inventories	25,070	(1,034)
Deferred revenue and customer advances	(10,651)	(58,304)
Accounts payable and other accrued expenses	(17,600)	(47,483)
Retirement plan contributions	(3,679)	(6,393)
Accrued income taxes	50,313	(3,064)
Net cash provided by continuing operations	362,233	218,783
Net cash used for discontinued operations		(4,225)
Net cash provided by operating activities	362,233	214,558
Net cash provided by investing activities	(430,617)	492,033
Net cash used for financing activities	(19,660)	(9,165)
Increase in cash and cash equivalents	(88,044)	697,426
Cash and cash equivalents at beginning of period	573,736	397,737
Cash and cash equivalents at end of period	485,692	1,095,163
Originally Reported
Change In Accounting Principle
Net income		238,675
Less: Income from discontinued operations		1,545
Less: Gain on disposal of discontinued operations		24,371
Income from continuing operations		212,759
Depreciation		38,426
Amortization		37,547
Stock-based compensation		22,514
Provision for excess and obsolete inventory		10,756
Other		1,379
Accounts receivable		25,233
Inventories		(1,034)
Other assets		(13,553)
Deferred revenue and customer advances		(58,304)
Accounts payable and other accrued expenses		(47,483)
Retirement plan contributions		(6,393)
Accrued income taxes		(3,064)
Net cash provided by continuing operations		218,783
Net cash used for discontinued operations		(4,225)
Net cash provided by operating activities		214,558
Net cash provided by investing activities		492,033
Net cash used for financing activities		(9,165)
Increase in cash and cash equivalents		697,426
Cash and cash equivalents at beginning of period		397,737
Cash and cash equivalents at end of period		1,095,163
Effect Of Accounting Change
Change In Accounting Principle
Net income		2,127
Less: Income from discontinued operations		158
Income from continuing operations		1,969
Amortization		(6,709)
Other		4,740
As Adjusted
Change In Accounting Principle
Net income		240,802
Less: Income from discontinued operations		1,703
Less: Gain on disposal of discontinued operations		24,371
Income from continuing operations		214,728
Depreciation		38,426
Amortization		30,838
Stock-based compensation		22,514
Provision for excess and obsolete inventory		10,756
Other		6,119
Accounts receivable		25,233
Inventories		(1,034)
Other assets		(13,553)
Deferred revenue and customer advances		(58,304)
Accounts payable and other accrued expenses		(47,483)
Retirement plan contributions		(6,393)
Accrued income taxes		(3,064)
Net cash provided by continuing operations		218,783
Net cash used for discontinued operations		(4,225)
Net cash provided by operating activities		214,558
Net cash provided by investing activities		492,033
Net cash used for financing activities		(9,165)
Increase in cash and cash equivalents		697,426
Cash and cash equivalents at beginning of period		397,737
Cash and cash equivalents at end of period		$ 1,095,163