Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012
Cash flow from operating activities:
Net income	$ 103,885	$ 103,237
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	12,854	11,300
Amortization expense	79,095	57,875
Provision for doubtful accounts	261	1,486
Deferred income taxes	(13,732)	381
Stock-based compensation	17,253	15,944
Income from equity method investments	(11,414)	(13,255)
Excess tax benefit for stock-based compensation	(7,616)	(15,254)
Provision for excess and obsolete inventories	569	4,993
Other non-cash items	(494)	(1,851)
Add decrease (increase) in assets:
Accounts receivable	(24,071)	(38,589)
Other receivables	(1,558)	(6,638)
Inventories	(14,725)	594
Other current and non-current assets	(12,165)	(8,904)
Add increase (decrease) in liabilities:
Accounts payable	(18,936)	4,148
Accrued compensation and benefits	(7,166)	2,270
Deferred revenue	55,994	32,117
Accrued warranty expense	(154)	(1,814)
Other current and non-current liabilities	14,163	7,054
Net cash provided by operating activities	172,043	155,094
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(178,953)	(337,676)
Acquisitions of property and equipment	(39,431)	(21,308)
Dividends received from equity method investments	2,526	221
Other	730	(706)
Net cash used in investing activities	(215,128)	(359,469)
Cash flow from financing activities:
Issuances of common stock, net	23,954	27,162
Excess tax benefit for stock-based compensation	7,616	15,254
Proceeds from debt and revolving credit lines	239,613	436,500
Payments on debt and revolving credit lines	(252,780)	(304,013)
Net cash provided by financing activities	18,403	174,903
Effect of exchange rate changes on cash and cash equivalents	(4,017)	(3,212)
Net increase (decrease) in cash and cash equivalents	(28,699)	(32,684)
Cash and cash equivalents, beginning of period	157,771	154,621
Cash and cash equivalents, end of period	$ 129,072	$ 121,937