Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011
Cash flow from operating activities:
Net income	$ 157,037	$ 120,246
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	16,910	14,683
Amortization expense	89,315	56,747
Provision for doubtful accounts	1,428	954
Deferred income taxes	646	(10,175)
Stock-based compensation	23,628	21,033
Income from equity method investments, net	(19,708)	(11,001)
Excess tax benefit for stock-based compensation	(16,673)	(11,698)
Provision for excess and obsolete inventories	6,372	6,915
Other non-cash items	(3,019)	2,738
Add decrease (increase) in assets:
Accounts receivable	(39,496)	(43,117)
Other receivables	(7,996)	13,471
Inventories	(4,650)	(11,344)
Other current and non-current assets	(2,844)	7,005
Add increase (decrease) in liabilities:
Accounts payable	7,828	2,039
Accrued compensation and benefits	6,375	(1,921)
Deferred revenue	12,390	7,638
Accrued warranty expense	(2,491)	402
Other current and non-current liabilities	18,842	(2,794)
Net cash provided by operating activities	243,894	161,821
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(355,484)	(758,243)
Acquisitions of property and equipment	(34,126)	(16,002)
Acquisitions of intangible assets	(795)	(1,666)
Payments to Acquire Equity Method Investments	0	(3,267)
Dividends received	2,140	7,500
Other	303	(168)
Net cash used in investing activities	(387,962)	(771,846)
Cash flow from financing activities:
Issuances of common stock, net	37,142	40,182
Excess tax benefit for stock-based compensation	16,673	11,698
Proceeds from long-term debt and revolving credit lines	478,556	702,225
Payments on long-term debt and revolving credit lines	(401,062)	(225,942)
Net cash provided by financing activities	131,309	528,163
Effect of exchange rate changes on cash and cash equivalents	(22)	(671)
Net decrease in cash and cash equivalents	(12,781)	(82,533)
Cash and cash equivalents, beginning of period	154,621	220,788
Cash and cash equivalents, end of period	$ 141,840	$ 138,255