Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Cash flow from operating activities:
Net income	$ 120,246	$ 67,765
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	14,683	13,310
Amortization expense	56,747	42,165
Provision for doubtful accounts	954	3,022
Deferred income taxes	(10,175)	(3,827)
Stock-based compensation	21,033	16,165
(Income) loss from equity method investments	(11,001)	(9,025)
Excess tax benefit for stock-based compensation	(11,698)	(1,971)
Provision for excess and obsolete inventories	6,915	3,573
Other non-cash items	2,738	(3,630)
Add decrease (increase) in assets:
Accounts receivable	(43,117)	(17,030)
Other receivables	13,471	191
Inventories	(11,344)	(32,549)
Other current and non-current assets	7,005	366
Add increase (decrease) in liabilities:
Accounts payable	2,039	15,796
Accrued compensation and benefits	(1,921)	15,780
Deferred revenue	7,638	1,982
Accrued warranty expense	402	(942)
Accrued liabilities	(2,794)	(24,109)
Net cash provided by operating activities	161,821	87,032
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(758,243)	(90,757)
Acquisitions of property and equipment	(16,002)	(17,162)
Acquisitions of intangible assets	(1,666)	(625)
Purchases of equity method investments	(3,267)	(5,692)
Dividends received	7,500	5,000
Other	(168)	99
Net cash used in investing activities	(771,846)	(109,137)
Cash flow from financing activities:
Issuances of common stock, net	40,182	31,885
Repurchase and retirement of common stock		(73,853)
Excess tax benefit for stock-based compensation	11,698	1,971
Proceeds from long-term debt and revolving credit lines	702,225
Payments on short-term and long-term debt	(225,942)	(467)
Net cash provided by (used in) financing activities	528,163	(40,464)
Effect of exchange rate changes on cash and cash equivalents	(671)	(223)
Net decrease in cash and cash equivalents	(82,533)	(62,792)
Cash and cash equivalents, beginning of period	220,788	273,848
Cash and cash equivalents, end of period	$ 138,255	$ 211,056