Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 189,716	$ 148,909	$ 103,613
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	23,691	20,509	18,198
Amortization expense	125,707	85,902	57,639
Provision for doubtful accounts	2,030	1,913	2,320
Deferred income taxes	(1,369)	(26,305)	(14,918)
Stock-based compensation	32,660	28,451	23,125
Income from equity method investments	(24,727)	(15,349)	(11,795)
Excess tax benefit for stock-based compensation	(25,345)	(14,762)	(9,639)
Acquisition / divestiture gain	(7,257)	(264)	(3,177)
Provision for excess and obsolete inventories	6,234	8,410	4,752
Other non-cash items	(4,221)	2,407	(1,433)
Add decrease (increase) in assets:
Accounts receivable	(24,388)	(31,874)	(7,376)
Other receivables	(5,017)	30,141	2,518
Inventories	(8,402)	(30,139)	(45,549)
Other current and non-current assets	(7,945)	10,519	2,257
Add increase (decrease) in liabilities:
Accounts payable	25,985	(4,310)	13,577
Accrued compensation and benefits	7,889	2,469	15,928
Deferred revenue	16,560	18,775	(1,177)
Accrued warranty expense	(1,520)	644	(2,217)
Accrued liabilities	20,419	5,583	(22,616)
Net cash provided by operating activities	340,700	241,629	124,030
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(728,114)	(759,737)	(136,419)
Acquisitions of property and equipment	(54,071)	(23,278)	(23,133)
Acquisitions of intangible assets	(1,170)	(1,666)	(2,063)
Purchases (sale) of equity method investments	4,913	(3,267)	(8,192)
Proceeds received from noncontrolling interest holder	0	0	7,470
Dividends received	13,178	12,398	5,858
Other	978	1,985	105
Net cash used in investing activities	(764,286)	(773,565)	(156,374)
Cash flows from financing activities:
Issuance of common stock, net	59,187	45,869	44,548
Repurchase and retirement of common stock	0	0	(73,853)
Proceeds from long-term debt and revolving credit lines	1,199,352	734,225	0
Excess tax benefit for stock-based compensation	25,345	14,762	9,639
Payments on short-term and long-term debt	(857,477)	(330,689)	(498)
Net cash provided by (used in) financing activities	426,407	464,167	(20,164)
Effect of exchange rate changes on cash and cash equivalents	329	1,602	(552)
Net increase (decrease) in cash and cash equivalents	3,150	(66,167)	(53,060)
Cash and cash equivalents, beginning of fiscal year	154,621	220,788	273,848
Cash and cash equivalents, end of fiscal year	$ 157,771	$ 154,621	$ 220,788