Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 04, 2014	Jun. 28, 2013
Cash flow from operating activities:
Net income	$ 146,152	$ 103,885
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	15,621	12,854
Amortization expense	78,443	79,095
Provision for doubtful accounts	869	261
Deferred income taxes	(1,700)	(13,732)
Stock-based compensation	21,087	17,253
Income from equity method investments	(8,688)	(11,414)
Gain on an equity sale	(15,091)	0
Excess tax benefit for stock-based compensation	(13,505)	(7,616)
Provision for excess and obsolete inventories	1,731	569
Other non-cash items	(1,867)	(494)
Add decrease (increase) in assets:
Accounts receivable	(42,563)	(24,071)
Other receivables	(3,708)	(1,558)
Inventories	(21,335)	(14,725)
Other current and non-current assets	(8,001)	(12,165)
Add increase (decrease) in liabilities:
Accounts payable	452	(18,936)
Accrued compensation and benefits	5,625	(7,166)
Deferred revenue	49,042	55,994
Accrued warranty expense	1,070	(154)
Other liabilities	10,954	14,163
Net cash provided by operating activities	214,588	172,043
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(25,094)	(178,953)
Acquisitions of property and equipment	(28,425)	(39,431)
Dividends received from equity method investments	22,463	2,526
Other	(2,684)	730
Net cash used in investing activities	(33,740)	(215,128)
Cash flow from financing activities:
Issuances of common stock, net of tax withholding	39,322	23,954
Excess tax benefit for stock-based compensation	13,505	7,616
Proceeds from debt and revolving credit lines	17,000	239,613
Payments on debt and revolving credit lines	(119,517)	(252,780)
Net cash provided by (used in) financing activities	(49,690)	18,403
Effect of exchange rate changes on cash and cash equivalents	534	(4,017)
Net increase (decrease) in cash and cash equivalents	131,692	(28,699)
Cash and cash equivalents, beginning of period	147,227	157,771
Cash and cash equivalents, end of period	$ 278,919	$ 129,072