Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Cash flows from operating activities:
Net (loss) income	$ (53,362)	$ 11,984
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	7,904	5,860
Amortization of debt issuance costs and discount	284	0
Change in deferred income tax provision	23,791	1,275
Loss (gain) on sale of marketable securities	288	(9)
Stock-based compensation expense	5,621	3,090
Changes in assets and liabilities:
Accounts receivable, net	12,294	(16,589)
Inventories	5,210	(11,958)
Prepaid expenses and other current assets	(62)	(997)
Accounts payable and accrued expenses (includes restructuring)	(2,707)	5,356
Accrued payroll obligations	(3,007)	(4,597)
Deferred income and allowances on sales to sell-through distributors	3,770	9,485
Deferred income and allowances on sales to sell-through distributors	(39)	0
Net cash (used in) provided by operating activities	(15)	2,900
Cash flows from investing activities:
Proceeds from sales or maturities of short-term marketable securities	108,881	13,150
Purchases of marketable securities	(4,005)	(19,050)
Cash paid for business acquisition, net of cash acquired	(425,890)	0
Capital expenditures, net	(2,878)	(2,395)
Cash paid for a non-marketable cost-method investment	(1,500)	0
Other investing activities, primarily time-based software licenses	(1,523)	(798)
Net cash used in investing activities	(326,915)	(9,093)
Cash flows from financing activities:
Net share settlement upon issuance of restricted stock units	(1,126)	(1,549)
Purchases of treasury stock	(6,993)	0
Net proceeds from issuance of common stock	866	5,774
Net proceeds from issuance of long-term debt	346,500	0
Cash paid for debt issuance costs	(8,280)	0
Net cash provided by financing activities	330,967	4,225
Effect of exchange rate change on cash	(6)	(176)
Net increase (decrease) in cash and cash equivalents	4,031	(2,144)
Beginning cash and cash equivalents	115,611	114,310
Ending cash and cash equivalents	119,642	112,166
Supplemental cash flow information:
Unrealized gain (loss) related to marketable securities, net, included in Accumulated other comprehensive (loss) income	268	(60)
Income taxes paid, net of refunds	1,063	380
Accrued purchases of plant and equipment	$ (433)	$ (68)