Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Cash flow from operating activities:
Net income	$ 48,932	$ 50,072
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	6,193	5,562
Amortization expense	39,332	28,797
Provision for doubtful accounts	65	587
Deferred income taxes	(11,809)	146
Stock-based compensation	8,818	7,789
Income from equity method investments, net	(4,257)	(6,192)
Excess tax benefit for stock-based compensation	(4,784)	(7,580)
Provision for excess and obsolete inventories	584	3,111
Other non-cash items	104	(977)
Add decrease (increase) in assets:
Accounts receivable	(61,956)	(46,425)
Other receivables	5,027	2,211
Inventories	(20,218)	5,928
Other current and non-current assets	(10,867)	(7,972)
Add increase (decrease) in liabilities:
Accounts payable	(6,081)	4,205
Accrued compensation and benefits	(12,037)	(1,895)
Deferred revenue	51,964	29,569
Accrued warranty expense	439	(728)
Other current and non-current liabilities	7,939	1,450
Net cash provided by operating activities	37,388	67,658
Cash flow from investing activities:
Acquisitions of businesses, net of cash acquired	(65,192)	(101,392)
Acquisitions of property and equipment	(14,927)	(7,644)
Acquisitions of intangible assets	0	(755)
Sale of equity method investments	2,430	0
Dividends received	1,284	181
Other	0	70
Net cash used in investing activities	(76,405)	(109,540)
Cash flow from financing activities:
Issuances of common stock, net	14,437	26,682
Excess tax benefit for stock-based compensation	4,784	7,580
Proceeds from long-term debt and revolving credit lines	113,000	181,500
Payments on short-term debt and and long-term debt	(103,981)	(122,850)
Net cash provided by financing activities	28,240	92,912
Effect of exchange rate changes on cash and cash equivalents	(3,442)	3,495
Net increase (decrease) in cash and cash equivalents	(14,219)	54,525
Cash and cash equivalents, beginning of period	157,771	154,621
Cash and cash equivalents, end of period	$ 143,552	$ 209,146