CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011
Cash flows from operating activities:
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
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation	39,812	38,426
Amortization	65,790	30,838
Stock-based compensation	30,634	22,514
Deferred taxes	7,076	(412)
Provision for excess and obsolete inventory	16,408	10,756
Non cash charge for the sale of inventories revalued at the date of acquisition	6,089
Contingent consideration adjustment	(8,406)
Tax benefit related to stock options and restricted stock units	(7,600)
Retirement plans actuarial losses	4,991	4,203
Other	(750)	2,328
Changes in operating assets and liabilities, net of businesses sold:
Accounts receivable	(76,134)	25,233
Inventories	25,070	(1,034)
Other assets	7,278	(13,553)
Accounts payable and other accrued expenses	(17,600)	(47,483)
Deferred revenue and customer advances	(10,651)	(58,304)
Retirement plans 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
Cash flows from investing activities:
Purchases of property, plant and equipment	(91,132)	(66,623)
Purchases of available-for-sale marketable securities	(513,057)	(593,261)
Proceeds from maturities of available-for-sale marketable securities	102,635	485,416
Proceed from sales of available-for-sale marketable securities	70,937	627,439
Net cash (used for) provided by continuing operations	(430,617)	452,971
Net cash provided by discontinued operations		39,062
Net cash (used for) provided by investing activities	(430,617)	492,033
Cash flows from financing activities:
Issuance of common stock under employee stock option and stock purchase plans	17,959	17,216
Tax benefit related to stock options and restricted stock units	7,600
Payments of long-term debt	(1,246)	(2,518)
Payments of contingent consideration	(43,973)
Repurchase of common stock		(23,863)
Net cash used for financing activities	(19,660)	(9,165)
(Decrease) 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