Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ 22,321	$ (29,606)	$ 78,232
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	20,807	22,149	16,666
Change in deferred income tax provision (benefit)	2,358	19,224	(49,376)
Gain on sale or maturity of marketable securities, net	0	(393)	(303)
Stock-based compensation	9,522	7,510	6,356
Changes in assets and liabilities: net of acquisitions
Accounts receivable, net	(3,138)	(9,954)	4,553
Inventories	(2,028)	(6,916)	2,618
Prepaid expenses and other assets	(1,339)	387	(1,367)
Accounts payable and accrued expenses (includes restructuring)	3,591	5,306	(1,059)
Accrued payroll obligations	7,510	(3,224)	(2,281)
Deferred income and allowances on sales to sell-through distributors	(3,058)	(208)	(4,931)
Other assets	(42)	1	13,253
Net cash provided by operating activities	56,504	4,276	62,361
Cash flows from investing activities:
Proceeds from sales or maturities of marketable securities	67,318	56,408	81,313
Purchase of marketable securities	(103,861)	(50,076)	(83,259)
Acquisitions net of cash acquired	0	0	(45,645)
Payment for purchase of intangible assets	0	0	(18,500)
Capital expenditures	(12,500)	(13,593)	(13,001)
Other investing activities, primarily time-based software licenses	(7,353)	(6,122)	(7,140)
Net cash used in investing activities	(56,396)	(13,383)	(86,232)
Cash flows from financing activities:
Net share settlement upon issuance of RSUs	(744)	(832)	(642)
Purchase of treasury stock	(6,161)	(17,549)	(14,436)
Net proceeds from issuance of common stock	3,076	4,382	6,173
Net cash used in financing activities	(3,829)	(13,999)	(8,905)
Effect of exchange rate change on cash	(505)	219	(185)
Net decrease in cash and cash equivalents	(4,226)	(22,887)	(32,961)
Beginning cash and cash equivalents	118,536	141,423	174,384
Ending cash and cash equivalents	114,310	118,536	141,423
Supplemental disclosures of non-cash investing and financing activites:
Unrealized gain (loss) related to marketable securities, net, included in Accumulated other comprehensive loss	284	(57)	(526)
Distribution of deferred compensation from trust assets	70	263	341
Income taxes paid, net of refunds	$ 1,370	$ 908	$ 1,824