Lattice Semiconductor (LSCC) 10-Q 15 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Apr. 04, 2015	8-May-15
Document Information [Line Items]
Entity Registrant Name	LATTICE SEMICONDUCTOR CORP
Entity Central Index Key	855658
Document Type	10-Q
Document Period End Date	4-Apr-15
Amendment Flag	FALSE
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	-1
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (actual number)		116,803,349

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
Income Statement [Abstract]
Product	$85,715	$96,637
Licensing and services	2,882	0
Total Revenue	88,597	96,637
Costs and expenses:
Cost of product revenue	40,672	42,499
Cost of licensing and services revenue	93	0
Research and development	27,642	21,239
Selling, general and administrative	21,088	18,749
Acquisition related charges	18,198	0
Restructuring charges	4,894	11
Amortization of acquired intangible assets	2,942	737
Costs and expenses	115,529	83,235
(Loss) income from operations	-26,932	13,402
Interest expense	-1,611	-48
Other (expense) income, net	-154	357
(Loss) income before income taxes	-28,697	13,711
Income tax expense	24,665	1,727
Net (loss) income	-53,362	11,984
Less: Net loss attributable to noncontrolling interest	15	0
Net (loss) income attributable to common stockholders	($53,347)	$11,984
Net (loss) income per share:
Basic (in dollars per share)	($0.46)	$0.10
Diluted (in dollars per share)	($0.46)	$0.10
Shares used in per share calculations:
Basic (in shares)	116,863	116,436
Diluted (in shares)	116,863	118,917

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive (Loss) Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	($53,362)	$11,984
Other comprehensive (loss) income:
Unrealized loss related to marketable securities, net	-20	-51
Less: reclassification adjustment for losses (gains) included in other (expense) income, net	288	-9
Translation adjustment	-6	-176
Defined benefit pension net actuarial losses	157	0
Comprehensive (loss) income	-53,257	11,748
Less: Comprehensive loss attributable to noncontrolling interest	15	0
Comprehensive (loss) income attributable to common stockholders	($53,242)	$11,748

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Apr. 04, 2015	Jan. 03, 2015
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$119,642	$115,611
Short-term marketable securities	40,127	139,233
Accounts receivable, net of allowance for doubtful accounts	80,777	62,372
Inventories	80,555	64,925
Prepaid expenses and other current assets	23,334	16,281
Total current assets	344,435	398,422
Property and equipment, less accumulated depreciation of $156,927 at April 4, 2015 and $154,078 at January 3, 2015	50,512	27,796
Intangible assets, net of amortization	198,613	9,537
Goodwill	268,698	44,808
Deferred income taxes	3,501	20,105
Other long-term assets	12,058	9,862
Total assets	877,817	510,530
Current liabilities:
Accounts payable and accrued expenses (includes restructuring)	78,309	32,171
Accrued payroll obligations	18,895	13,629
Current portion of long-term debt	122	0
Deferred income and allowances on sales to sell-through distributors	19,586	14,946
Deferred license revenue	344	0
Total current liabilities	117,256	60,746
Long-term debt	338,378	0
Other long-term liabilities	26,024	8,809
Total liabilities	481,658	69,555
Commitments and contingencies
Redeemable noncontrolling interest	7,207	0
Stockholders' equity:
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $.01 par value, 300,000,000 shares authorized; 116,886,000 shares issued and 116,675,000 shares outstanding as of April 4, 2015 and 117,288,000 shares issued and outstanding as of January 3, 2015	1,169	1,173
Additional paid-in capital	637,906	635,299
Treasury stock, at cost	-1,384	0
Accumulated deficit	-246,960	-193,613
Accumulated other comprehensive loss	-1,779	-1,884
Total stockholders' equity	388,952	440,975
Total liabilities, redeemable noncontrolling interests and stockholders' equity	$877,817	$510,530

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Apr. 04, 2015	Jan. 03, 2015
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Preferred stock, par value per share (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	116,886,000	117,288,000
Common stock, shares outstanding	116,675,000	117,288,000
Accumulated Depreciation	$156,927	$154,078

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	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)

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Apr. 04, 2015
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies:
	The accompanying Consolidated Financial Statements are unaudited and have been prepared by Lattice Semiconductor Corporation (“Lattice,” the “Company,” “we,” “us,” or “our”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and in our opinion include all adjustments, consisting of normal recurring adjustments, necessary for the fair statement of results for the interim periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. These Consolidated Financial Statements should be read in conjunction with our audited financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended January 3, 2015.
	We report based on a 52 or 53-week fiscal year ending on the Saturday closest to December 31. Our first quarter of fiscal 2015 and first quarter of fiscal 2014 ended on April 4, 2015 and March 29, 2014, respectively. All references to quarterly, three months ended financial results are references to the results for the relevant 13-week fiscal period.
	Principles of Consolidation
	The accompanying Consolidated Financial Statements include the accounts of Lattice and its subsidiaries after the elimination of all intercompany balances and transactions.
	Cash Equivalents and Marketable Securities
	We consider all investments that are readily convertible into cash and have original maturities of three months or less to be cash equivalents. Cash equivalents consist primarily of highly liquid investments in time deposits or money market accounts and are carried at cost. We account for marketable securities as available-for-sale investments, as defined by U.S. GAAP, and record unrealized gains or losses to Accumulated other comprehensive loss on our Consolidated Balance Sheets, unless losses are considered other than temporary, in which case, those are recorded directly to the Consolidated Statements of Operations and Statements of Comprehensive (Loss) Income.
	Fair Value of Financial Instruments
	We invest in various financial instruments including corporate and government bonds, notes and commercial paper. In the past we have also invested in auction rate securities. We valued these instruments at their fair value and monitored the portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other than temporary, we record an impairment charge and establishes a new carrying value. We assess other than temporary impairment of marketable securities in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 820, “Fair Value Measurements.” The framework under the provisions of ASC 820 establishes three levels of inputs that may be used to measure fair value. Each level of input has different levels of subjectivity and difficulty involved in determining fair value.
	Foreign Exchange and Translation of Foreign Currencies
	We have international subsidiary and branch operations. In addition, a portion of our silicon wafer and other purchases are denominated in Japanese yen, we bill certain Japanese customers in yen and collect a Japanese consumption tax refund in yen. Gains or losses from foreign exchange rate fluctuations on balances denominated in foreign currencies are reflected in Other (expense) income, net. Realized and unrealized gains or losses on foreign currency transactions were not significant for the periods presented. We translate accounts denominated in foreign currencies in accordance with ASC 830, “Foreign Currency Matters,” using the current rate method under which asset and liability accounts are translated at the current rate, while stockholders' equity accounts are translated at the appropriate historical rates, and revenue and expense accounts are translated at average monthly exchange rates. Translation adjustments related to the consolidation of foreign subsidiary financial statements are reflected in Accumulated other comprehensive loss in Stockholders' equity.
	Derivative Financial Instruments
	We mitigate foreign currency exchange rate risk by entering into foreign currency forward exchange contracts. At April 4, 2015 and January 3, 2015, we had open foreign exchange contracts of $5.6 million and $4.2 million, respectively. Two contracts outstanding at April 4, 2015 which settled in April 2015; six contracts will settle in June 2015 and two will settle in June 2016. Although these hedges mitigate our foreign currency exchange rate exposure from an economic perspective, they were not designated as "effective" hedges under GAAP and as such are adjusted to fair value through Other (expense) income, net, with an impact of less than $0.5 million for the periods reported in the Consolidated Statements of Operations. We do not hold or issue derivative financial instruments for trading or speculative purposes.
	Concentration Risk
	Potential exposure to concentration risk consists primarily of revenue, cash and cash equivalents, marketable securities, trade receivables and supply of wafers for our new products.
	Our top five end customers constituted approximately 35% of our revenue for the first quarter of fiscal 2015, compared to approximately 51% for the first quarter of fiscal 2014.
	Our two largest end customers accounted for approximately 10% each of total revenue in the first quarter of fiscal 2015 and 23% and 14% of total revenue in the first quarter of fiscal 2014. No other customers accounted for more than 10% in either quarter.
	Concentration of credit risk with respect to trade receivables is mitigated by our credit and collection process including active management of collections, credit limits, routine credit evaluations for essentially all customers and secure transactions with letters of credit or advance payments where appropriate. Accounts receivable do not bear interest and are shown net of allowances for doubtful accounts of $0.9 million and $0.9 million at April 4, 2015 and January 3, 2015, respectively. We regularly review our allowance for doubtful accounts and the aging of our accounts receivable. Write-offs for uncollected trade receivables have not been significant to date.
	We place our investments primarily through two financial institutions and mitigate the concentration of credit risk by limiting the maximum portion of the investment portfolio which may be invested in any one instrument. Our investment policy defines approved credit ratings for investment securities. Investments on-hand in marketable securities consisted primarily of money market instruments, “AA” or better corporate notes and bonds and commercial paper, and U.S. government agency obligations. See Note 5 for a discussion of the liquidity attributes of our marketable securities.
	We rely on a limited number of foundries for our wafer purchases including Fujitsu Limited, Seiko Epson Corporation, Taiwan Semiconductor Manufacturing Company, Ltd, and United Microelectronics Corporation.
	Revenue Recognition and Deferred Income
	We sell our products directly to end customers, through a network of independent manufacturers' representatives, and indirectly through a network of independent sell-in and sell-through distributors. Distributors provide periodic data regarding the product, price, quantity, and end customer when products are resold, as well as the quantities of our products they still have in stock.
	Revenue from sales to original equipment manufacturers ("OEMs") and sell-in distributors is generally recognized upon shipment. Reserves for sell-in stock rotations, where applicable, are estimated based primarily on historical experience and provided for at the time of shipment. Revenue from sales by our sell-through distributors is recognized at the time of reported resale. Under both types of revenue recognition, persuasive evidence of an arrangement exists, the price is fixed or determinable, title has transferred, collection of resulting receivables is reasonably assured, and there are no remaining customer acceptance requirements and no remaining significant performance obligations.
	Orders from our sell-through distributors are initially recorded at published list prices; however, for a majority of our sales, the final selling price is determined at the time of resale and in accordance with a distributor price agreement. In certain circumstances, we allow sell-through distributors to return unsold products. At times, we protect our sell-through distributors against reductions in published list prices. For these reasons, we do not recognize revenue until products are resold by sell-through distributors to an end customer.
	For sell-through distributors, at the time of shipment to distributors, we (a) record Accounts receivable at published list price since there is a legally enforceable obligation from the distributor to pay us currently for product delivered, (b) relieve inventory for the carrying value of goods shipped since legal title has passed to the distributor, and (c) record deferred revenue and deferred cost of sales in Deferred income and allowances on sales to sell-through distributors in the liability section of our Consolidated Balance Sheets. The final price is set at the time of resale and is determined in accordance with a distributor price agreement. Revenue and cost of sales to sell-through distributors are deferred until either the product is resold by the distributor or, in certain cases, return privileges terminate, at which time Revenue and Cost of products sold are reflected in Net (loss) income, and Accounts receivable, net are adjusted to reflect the final selling price.
	The components of Deferred income and allowances on sales to sell-through distributors are presented in the following table:
	(In thousands)	April 4,			January 3,
		2015			2015
	Inventory valued at published list price and held by sell-through distributors with right of return	$	56,489		$	50,854
	Allowance for distributor advances	(30,440		)	(29,490		)
	Deferred cost of sales related to inventory held by sell-through distributors	(6,463		)	(6,418		)
	Total Deferred income and allowances on sales to sell-through distributors	$	19,586		$	14,946
	A significant portion of our revenue in the first quarter of fiscal 2015 was from sell-through distributors. Resale of products by sell-through distributors as a percentage of total revenue was 48% for the three months ended April 4, 2015, and 39% for the three months ended March 29, 2014.
	We must use estimates and apply judgment to reconcile sell-through distributors' reported inventories to their activities. Errors in our estimates or judgments could result in inaccurate reporting of our Revenue, Cost of products sold, Deferred income and allowances on sales to sell-through distributors, and Net (loss) income.
	Licensing and Services Revenue
	Our licensing and services revenue is comprised of revenue from our intellectual property ("IP") core licensing activity, patent monetization activities, device management system and remote support services and royalty and adopter fee revenue from our standards activities. These activities are complementary to our product sales and help us monetize our intellectual property and accelerate market adoption curves associated with our technology and standards.
	We enter into IP licensing agreements that generally provide licensees the right to incorporate the Company’s IP components in their products pursuant to terms and conditions that vary by licensee. Revenue earned under these agreements is classified as licensing revenue. Our IP licensing agreements generally include multiple elements, which may include one or more off-the-shelf or customized IP licenses bundled with support services covering a fixed period of time, generally one year. If the different elements of a multiple-element arrangement qualify as separate units of accounting, we allocate the total arrangement consideration to each element based on relative selling price.
	Amounts allocated to off-the-shelf IP licenses are recognized at the time of sale provided the other conditions for revenue recognition have been met. Amounts allocated to the support services are deferred and recognized on a straight-line basis over the support period, generally one year. Certain licensing agreements provide for royalty payments based on agreed upon royalty rates, which may be fixed or variable depending on the terms of the agreement. The amount of revenue we recognize is based on a specified time period or on the agreed-upon royalty rate multiplied by the number of units shipped by the customer.
	From time to time, we enter into IP licensing agreements that involve significant modification, customization or engineering services. Revenues derived from these contracts are accounted for using the percentage-of-completion method or completed contract method. The completed contract method is used for contracts where there is a risk of final acceptance by the customer or for short-term contracts. HDMI royalty revenue is determined by a contractual allocation formula agreed to by the members ("Founders") of the HDMI consortium. Evidence of an arrangement, as to HDMI royalty revenue, is deemed complete when all of the Founders agree on the royalty sharing formula.
	Use of Estimates
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and classification of assets, such as marketable securities, accounts receivable, inventory, goodwill (including the assessment of reporting unit), intangible assets, current and deferred income taxes, accrued liabilities (including restructuring charges and bonus arrangements), deferred income and allowances on sales to sell-through distributors, disclosure of contingent assets and liabilities at the date of the financial statements, anticipated amounts used in acquisition valuations and purchase accounting, and the reported amounts of revenue and expenses during the fiscal periods presented. Actual results could differ from those estimates.

New_Accounting_Pronouncements

New Accounting Pronouncements	3 Months Ended
	Apr. 04, 2015
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements:
	In April 2014, the FASB issued Accounting Standards Update ("ASU") No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for reporting discontinued operations to only those disposals which represent a strategic shift in operations. In addition, the new guidance requires expanded disclosures about discontinued operations, including pre-tax income attributable to a disposal of a significant part of an organization that does not qualify for discontinued operations reporting. The new standard became effective for us on January 4, 2015 and did not have a material impact on our consolidated financial statements.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance under U.S. GAAP when it becomes effective. The new standard will become effective for us on January 1, 2017. Early adoption is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. We are currently evaluating the impact of ASU 2014-09 on our consolidated financial statements and related disclosures and have not yet selected a transition method. In April 2015, the FASB proposed a one year deferral of the effective date with early adoption permitted for annual reporting periods beginning after December 15, 2016, and interim periods within that year.
	In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which focuses on the consolidation evaluation for reporting organizations and requires the evaluation of whether or not certain legal entities should be consolidated. All legal entities are subject to reevaluation under the revised consolidation model. The new standard will become effective for us on January 3, 2016. Early adoption is permitted, including adoption in an interim period. We do not expect the adoption of this accounting standard update to impact our consolidated financial statements.
	In April 2015, the FASB issued ASU No. 2015-03, "Simplifying the Presentation of Debt Issuance Cost". The ASU requires debt issuance costs associated with a recognized debt liability to be presented on the balance sheet as a direct deduction from the carrying amount of the corresponding debt liability. This new guidance is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. An entity should apply the new guidance on a retrospective basis. We adopted this ASU effective with this filing for the first quarter of fiscal year 2015.

Net_Loss_Income_Per_Share

Net (Loss) Income Per Share	3 Months Ended
	Apr. 04, 2015
Earnings Per Share [Abstract]
Net (Loss) Income Per Share	Net (Loss) Income per Share:
	We compute basic net (loss) income per share by dividing net (loss) income available to common stockholders by the weighted average number of common shares outstanding during the period. To determine diluted share count, we apply the treasury stock method to determine the dilutive effect of outstanding stock option shares, restricted stock units ("RSUs"), Employee Stock Purchase Plan ("ESPP") shares and treasury stock. Our application of the treasury stock method includes, as assumed proceeds, the average unamortized stock-based compensation expense for the period and the impact of the pro forma deferred tax benefit or cost associated with stock-based compensation expense. When we are in a net loss position, the treasury stock method is not used.
	A reconciliation of basic and diluted Net (loss) income per share is presented below:
		Three Months Ended
	(in thousands, except per share data)	April 4, 2015			March 29, 2014
	Basic and diluted Net (loss) income	$	(53,347	)	$	11,984
	Shares used in basic Net (loss) income per share	116,863			116,436
	Dilutive effect of stock options, RSUs and ESPP shares	—			2,481
	Shares used in diluted Net (loss) income per share	116,863			118,917
	Basic Net (loss) income per share	$	(0.46	)	$	0.1
	Diluted Net (loss) income per share	$	(0.46	)	$	0.1
	The computation of diluted Net (loss) income per share for the three months ended April 4, 2015 excludes the effects of stock options, RSUs, and ESPP shares, aggregating approximately 11.5 million which are antidilutive. The computation of diluted Net income per share for the three months ended March 29, 2014 includes the effects of stock options, RSUs, and ESPP shares, aggregating approximately 2.5 million, which are dilutive, and excludes the effects of stock options, RSUs and ESPP shares aggregating approximately 5.3 million, which are antidilutive. Stock options, RSUs and ESPP shares are considered antidilutive when the aggregate of exercise price, unrecognized stock-based compensation expense and excess tax benefit are greater than the average market price for our common stock during the period or when the Company is in a net loss position, as the effects would reduce the loss per share. Stock options, RSUs and ESPP shares that are antidilutive at April 4, 2015 could become dilutive in the future.

Marketable_Securities

Marketable Securities	3 Months Ended
	Apr. 04, 2015
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities:
	Our short-term marketable securities have contractual maturities of up to two years. The following table summarizes the remaining maturities of our marketable securities at fair value:
	(In thousands)	April 4,		January 3,
		2015		2015
	Short-term marketable securities:
	Maturing within one year	$	17,635	$	60,965
	Maturing between one and two years	22,492		78,268
	Total marketable securities	$	40,127	$	139,233
	The following table summarizes the composition of our marketable securities at fair value:
	(In thousands)	April 4,		January 3,
		2015		2015
	Short-term marketable securities:
	Corporate and government bonds and notes and commercial paper	$	34,498	$	139,233
	Certificates of deposit	5,629		—
	Total marketable securities	$	40,127	$	139,233

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	3 Months Ended
	Apr. 04, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments:
		Fair value measurements as of								Fair value measurements as of
		4-Apr-15								January 3, 2015
	(In thousands)	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
	Short-term marketable securities	$	40,127	$	34,498	$	5,629	$	—	$	139,233	$	139,233	$	—	$	—
	Foreign currency forward exchange contracts, net	339		—		339		—		414		—		414		—
	Total fair value of financial instruments	$	40,466	$	34,498	$	5,968	$	—	$	139,647	$	139,233	$	414	$	—
	We invest in various financial instruments including corporate and government bonds and notes, and commercial paper. In the past we have also invested in auction rate securities. In addition, we enter into foreign currency forward exchange contracts to mitigate our foreign currency exchange rate exposure. We carry these instruments at their fair value in accordance with ASC 820. The framework under the provisions of ASC 820 establishes three levels of inputs that may be used to measure fair value. Each level of input has different levels of subjectivity and difficulty involved in determining fair value.
	Level 1 instruments generally represent quoted prices for identical assets or liabilities in active markets. Therefore, determining fair value for Level 1 instruments generally does not require significant management judgment, and the estimation is not difficult. Our Level 1 instruments consist of federal agency, corporate notes and bonds, and commercial paper that are traded in active markets and are classified as Short-term marketable securities on our Consolidated Balance Sheets.
	Level 2 instruments include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices for identical instruments in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Our Level 2 instruments consist of certificates of deposit and foreign currency exchange contracts, entered into to hedge against fluctuation in the Japanese yen.
	Level 3 instruments include unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Our auction rate securities were classified as Level 3 instruments. Management used a combination of the market and income approach to derive the fair value of auction rate securities, which included third party valuation results, investment broker provided market information and available information on the credit quality of the underlying collateral. As a result, the determination of fair value for Level 3 instruments requires significant management judgment and subjectivity.
	There were no transfers between any of the levels during the first three months of fiscal 2015 or 2014.
	During the three months ended April 4, 2015 and March 29, 2014, the following changes occurred in our Level 3 instruments:
		Three Months Ended
	(In thousands)	April 4,		March 29,
		2015		2014
	Beginning fair value of Long-term marketable securities	$	—	$	5,241
	Fair value of securities sold or redeemed	—		—
	Ending fair value of Long-term marketable securities	$	—	$	5,241
	In the second quarter of fiscal 2014, we sold our remaining auction rate securities, with a par value of $5.7 million and an estimated fair value of $5.2 million.
	In accordance with ASC 320, “Investments-Debt and Equity Securities,” we recorded an unrealized loss of $0.1 million during each the three months ended April 4, 2015 and March 29, 2014 on certain Short-term marketable securities (Level 1 instruments), which have been recorded in Accumulated other comprehensive loss. Future fluctuations in fair value related to these instruments that we deem to be temporary, including any recoveries of previous write-downs, would be recorded to Accumulated other comprehensive loss. If we were to determine in the future that any further decline in fair value is other-than-temporary, we would record an impairment charge, which could have a materially adverse effect on our operating results. If we were to liquidate our position in these securities, it is likely that the amount of any future realized gain or loss would be different from the unrealized gain or loss reported in Accumulated other comprehensive loss.

Inventories

Inventories	3 Months Ended
	Apr. 04, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories:
	(In thousands)	April 4,		3-Jan-15
		2015
	Work in progress	$	58,236	$	49,554
	Finished goods	22,319		15,371
	Total inventories	$	80,555	$	64,925

Business_Combinations_and_Good

Business Combinations and Goodwill	3 Months Ended
	Apr. 04, 2015
Business Combinations [Abstract]
Business Combinations and Goodwill	Business Combinations and Goodwill:
	On March 10, 2015, we acquired 100% of the outstanding equity of Silicon Image, Inc. ("Silicon Image"), a provider of video, audio and data connectivity solutions for the mobile, consumer electronics, and personal computer markets.
	The preliminary fair value of the purchase price consideration consisted of the following:
	(In thousands)	Estimated Fair Value
	Cash paid to Silicon Image stockholders	$	575,955
	Cash paid for options and restricted stock units	2,205
	Accrual for options and restricted stock units	5,178
	Fair value of partially vested assumed equity awards	5,139
	Total purchase consideration	$	588,477
	There is no contingent consideration included in the determination of the purchase consideration.
	We have preliminarily allocated the purchase price consideration to the tangible and identified intangible assets acquired and liabilities assumed on the basis of their respective estimated fair values on the acquisition date. Our preliminary allocation of the total purchase price is as follows:
	(In thousands)	Estimated Fair Value
	Assets acquired:
	Cash, cash equivalents and short-term investments	$	157,923
	Accounts receivable	30,677
	Inventory	20,839
	Other current assets	7,183
	Property, plant and equipment	23,429
	Other non-current assets	1,573
	Intangible assets	192,079
	Goodwill	223,890
	Total assets acquired	657,593
	Liabilities assumed
	Accounts payable and other accrued liabilities	46,350
	Other current liabilities	1,252
	Long-term liabilities	14,342
	Redeemable noncontrolling interest	7,172
	Total liabilities assumed	69,116
	Fair value of net assets acquired	$	588,477
	The following table presents details of the identified intangible assets acquired through the acquisition of Silicon Image:
	(In thousands)	Asset Life in Years		Fair Value
	Developed technology	5-Mar		$	125,000
	Customer relationships	7-Apr		29,458
	Licensed technology	5-Mar		1,852
	Patents	5		769
	Total identified finite-lived intangible assets			157,079
	In-process research and development	indefinite		35,000
	Total identified intangible assets			$	192,079
	We do not believe there is any significant residual value associated with these intangible assets. We are amortizing the intangible assets using the straight-line method over their estimated useful lives. The estimation of the fair values of the intangible assets required the use of valuation techniques and entailed consideration of all the relevant factors that might affect the fair value such as present value factors, and estimates of future revenues and costs.
	The Company is currently completing its evaluation of information and assumptions used in the recognition and determination of the purchase price allocation. This includes reviewing information, inputs, assumptions, and valuation methodologies used to estimate consideration, liabilities, taxes, intangible assets, deferred revenue, inventory, and fixed assets. The purchase price allocation is based on the preliminary valuation and is our best estimate as of the filing date of this 10-Q. The purchase price allocation will be subject to revision as more detailed analysis is performed and completed.
	Silicon Image’s results of operations and the estimated fair value of the assets acquired and liabilities assumed are included in Lattice's unaudited consolidated financial statements effective March 11, 2015. Silicon Image's revenue and net loss for the period from March 11, 2015 through April 4, 2015 were approximately $12 million and $14.8 million, respectively. Acquisition related charges, which were expensed as incurred, were approximately $8 million.
	Goodwill
	Goodwill represents the excess of the purchase price over the fair value of the underlying net tangible and intangible assets. The goodwill recognized in the acquisition of Silicon Image was derived from expected benefits from cost synergies and knowledgeable and experienced workforce who joined the Company after the acquisition. Goodwill will not be amortized, but will instead be tested for impairment annually or more frequently if certain indicators of impairment are present. Goodwill impairment is not expected to be tax deductible for income tax purposes. No impairment charges relating to goodwill or intangible assets were recorded for the first three months of 2015 or 2014 as no indicators of impairment were present. The goodwill balance of $268.7 million at April 4, 2015 is comprised of $44.8 million from prior acquisitions combined with the $223.9 million from the acquisition of Silicon Image.
	Unaudited Pro Forma Financial Information
	The unaudited pro forma financial information in the table below summarizes the combined results of operations for the Company and Silicon Image as if the merger occurred on December 29, 2013, the first day of our 2014 fiscal year. The pro forma financial information for the periods presented includes adjustments to amortization and depreciation for intangible assets and property, plant and equipment acquired, adjustments to share-based compensation expense, and interest expense for the additional indebtedness incurred as part of the acquisition. The total of nonrecurring pro forma adjustments directly attributable to the business combination included in the reported pro forma revenue and earnings for the three months ended March 29, 2014 and excluded in the reported pro forma revenue and earnings for the three months ended April 4, 2015 was $26.3 million related to acquisition-related charges. The pro forma financial information as presented below is for informational purposes only, is based on certain assumptions and estimates, and is not indicative of the results of operations that would have been achieved if the acquisition had taken place at the beginning of the first period presented.
	The unaudited pro forma financial information for the three months ended April 4, 2015 combined the historical results of the Company for the three months ended April 4, 2015, the historical results of Silicon Image for the three months ended April 4, 2015, and the effects of the pro forma adjustments described above.
	The unaudited pro forma financial information for the three months ended March 29, 2014 combined the historical results of the Company for the three months ended March 29, 2014, the historical results of Silicon Image for the three months ended March 29, 2014, and the effects of the pro forma adjustments described above.
			Three Months Ended
	(Dollars in thousands, except per share amounts)		April 4, 2015			March 29, 2014
	Total revenues		$	133,498		$	158,198
	Net loss attributable to common stockholders		$	(48,288	)	$	(28,241	)
	Basic net loss per share		$	(0.41	)	$	(0.24	)
	Diluted net loss per share		$	(0.41	)	$	(0.24	)
	The pro forma adjustments did not have any impact on the pro forma combined provision for income taxes for the three months ended April 4, 2015 and March 29, 2014 due to net loss positions and valuation allowances on deferred income tax assets in those periods.

Intangible_Assets

Intangible Assets	3 Months Ended
	Apr. 04, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets:
	In connection with our acquisitions of Silicon Image in March 2015 and SiliconBlue in December 2011 we recorded identifiable intangible assets related to developed technology, customer relationships, licensed technology, patents and in-process research and development based on guidance for determining fair value under the provisions of ASC 820. The following table summarizes the details of our total purchased intangible assets:
	(In thousands)		Weighted Average Amortization Period (in years)	Gross			Accumulated Amortization			Intangible assets, net of amortization April 4, 2015
	Developed technology		4.7	$	135,700		$	(6,873	)	$	128,827
	Customer relationships		5.5	37,258			(5,032		)	32,226
	Licensed technology		2.5	1,852			(50		)	1,802
	Patents		5	769			(11		)	758
	Total identified finite-lived intangible assets			175,579			(11,966		)	163,613
	In-process research and development		indefinite	35,000			—			35,000
	Total identified intangible assets			$	210,579		$	(11,966	)	$	198,613
	We recorded amortization expense on the Consolidated Statements of Operations as follows:
		Three Months Ended
	(In thousands)	4-Apr-15			29-Mar-14
	Research and development	$	61		$	—
	Amortization of acquired intangible assets	2,942			737
		$	3,003		$	737
	The annual expected amortization expense of acquired intangible assets with finite lives is as follows:
	(In thousands)	Amount
	2015 (remaining 9 months)	$	27,491
	2016	36,452
	2017	35,635
	2018	29,752
	Thereafter	34,283
	Total	$	163,613

Changes_in_Stockholders_Equity

Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss	3 Months Ended
	Apr. 04, 2015
Stockholders' Equity Note [Abstract]
Changes in Stockholders' Equity and Accumulated other Comprehensive Loss	Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss:
	(In thousands)	Common			Additional Paid-in			Treasury			Accumulated			Accumulated			Total
		stock			capital			stock			deficit			other
														comprehensive
														loss
	Balances, January 3, 2015	$	1,173		$	635,299		$	—		$	(193,613	)	$	(1,884	)	$	440,975
	Net loss attributable to common stockholders for the three months ended April 4, 2015	—			—			—			(53,347		)	—			(53,347		)
	Unrealized loss related to marketable securities, net	—			—			—			—			(20		)	(20		)
	Recognized loss on redemption of marketable securities, previously unrealized	—			—			—			—			288			288
	Translation adjustments	—			—			—			—			(6		)	(6		)
	Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	4			(264		)	—			—			—			(260		)
	Stock repurchase	—			—			(6,993		)	—			—			(6,993		)
	Retirement of treasury stock	(8		)	(5,601		)	5,609			—			—			—
	Stock-based compensation expense related to stock options, ESPP and RSUs	—			3,384			—			—			—			3,384
	Fair value of stock options and RSUs assumed in business acquisition	—			5,139			—			—			—			5,139
	Defined benefit pension net actuarial losses	—			—			—			—			(157		)	(157		)
	Other	—			(51		)	—			—			—			(51		)
	Balances, April 4, 2015	$	1,169		$	637,906		$	(1,384	)	$	(246,960	)	$	(1,779	)	$	388,952
	On March 3, 2014, our Board of Directors approved a stock repurchase program pursuant to which up to $20.0 million of outstanding common stock may be repurchased from time to time. The duration of the repurchase program was twelve months. During fiscal 2014, approximately 1.9 million shares were repurchased for $13.1 million. The 2014 program was completed during the three months ended April 4, 2015, during which approximately 1.1 million shares were repurchased for $7.0 million.

Income_Taxes

Income Taxes	3 Months Ended
	Apr. 04, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes:
	For the three months ended April 4, 2015 and March 29, 2014, we recorded an income tax provision of approximately $24.7 million and $1.7 million, respectively. The income tax provision for the three months ended April 4, 2015 represents tax at the federal, state and foreign statutory tax rates adjusted for withholding taxes, changes in uncertain tax positions, changes in the U.S. valuation allowance, as well as other non-deductible items in the United States and foreign jurisdictions. The difference between the U.S. federal statutory tax rate of 35% and our effective tax rate is primarily due to a valuation allowance increase in the United States and income earned in lower tax rate jurisdictions, for which no U.S. income tax has been provided, because we intend to permanently reinvest these earnings outside of the United States.
	During the first quarter of 2015, we concluded that it was not more-likely-than-not that we would be able to realize the benefit of our remaining U.S. deferred tax assets, resulting in an increase to the valuation allowance and an increase to the tax provision of $21.0 million. We based this conclusion on changes to our expected operations in the United States as a result of the acquisition of Silicon Image. We exercised significant judgment and considered estimates about our ability to generate revenue and gross profits sufficient enough to offset expenditures in future periods within the United States.
	We are subject to federal income tax as well as income tax of multiple state and foreign jurisdictions. We are no longer subject to federal, state and local, or foreign income tax examinations for years before 2011, 2010 and 2008, respectively. However, net operating loss ("NOL") and credit carryforwards from all years are subject to examination and adjustments for at least three years following the year in which we used the attributes.
	Our U.S. and French income tax returns are currently under examination for 2011 and 2012, as well as our Singapore income tax return for 2012. We are not under examination in any other jurisdictions.
	We believe that it is reasonably possible that $15.2 million of unrecognized tax benefits and less than $0.1 million of associated interest and penalties could be recognized during the next twelve months. The $15.2 million potential change would represent a decrease in unrecognized tax benefits, with $14.1 million related to the valuation of our intellectual property sold to one of our subsidiaries, which is currently under tax authority examination. The remaining $1.1 million relates to tax filings for years that will no longer be subject to examination under expiring statutes of limitations.
	We have U.S. federal NOL carryforwards that expire at various dates between 2023 and 2035. We have state net operating loss carryforwards that expire at various dates from 2015 through 2035. We also have federal and state credit carryforwards, some not expiring and others expiring at various dates from 2015 through 2034.
	We are not currently paying U.S. federal income taxes and do not expect to pay such taxes until we fully utilize our tax NOL and credit carryforwards. We expect to pay a nominal amount of state income tax. We are paying foreign income and withholding taxes, which are reflected in Income tax expense in our Consolidated Statements of Operations and are primarily related to the cost of operating offshore activities and subsidiaries. We accrue interest and penalties related to uncertain tax positions in the Income tax expense.

Restructuring

Restructuring	3 Months Ended
	Apr. 04, 2015
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring:
	In March 2015, our Board of Directors approved an internal restructuring plan (the "Plan"), in connection with our acquisition of Silicon Image, involving the Company and certain of its subsidiaries. The Plan is designed to realize synergies from the acquisition by eliminating redundancies created as a result of combining the two companies. The total cost of the plan is expected to be in the range of $20 million to $25 million and is expected to be substantially completed by the end of fiscal 2015. During the first quarter of 2015, we recorded severance and related expenses of $4.9 million, which is included in Restructuring charges in our Consolidated Statements of Operations.
	The following table displays the activity related to restructuring:
	(In thousands)	Severance and related			Lease Terminations, Outside Services and Facilities			Other			Total
	Balance at December 28, 2013	$	17		$	368		$	147		$	532
	Restructuring Charges	—			—			9			9
	Cash Payments	(8		)	(266		)	(16		)	(290		)
	Adjustments to prior restructuring costs	(9		)	11			—			2
	Balance at March 29, 2014	$	—		$	113		$	140		$	253
	Balance at January 3, 2015	$	—		$	43		$	139		$	182
	Restructuring Charges	4,893			—			—			4,893
	Cash Payments	—			(9		)	(139		)	(148		)
	Adjustments to prior restructuring costs	—			1			—			1
	Balance at April 4, 2015	$	4,893		$	35		$	—		$	4,928

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Apr. 04, 2015
Debt Disclosure [Abstract]
Long-term Debt	Long-Term Debt:
	On March 10, 2015, we entered into a secured credit agreement (the "Credit Agreement") with Jefferies Finance, LLC and certain other lenders for purposes of funding, in part, our acquisition of Silicon Image. The Credit Agreement provided for a $350 million term loan (the "Term Loan") maturing on March 10, 2021 (the "Term Loan Maturity Date"). We received $346.5 million after deduction of an original issue discount of $3.5 million and we paid debt issuance costs of $8.3 million. The Term Loan bears variable interest equal to the LIBOR, subject to a 1.00% floor, plus a spread of 4.25%. The current effective interest rate on the Term Loan is 6.16%.
	The Term Loan is payable through a combination of quarterly installments of approximately $0.9 million beginning on July 4 2015, and annual excess cash flow payments, as defined in the Credit Agreement, beginning in the second quarter of 2016. Payments could also be due upon certain issuances of additional indebtedness, and certain asset dispositions, with any remaining outstanding principal amount due and payable on the Term Loan Maturity Date. The percentage of excess cash flow we are required to pay ranges from 0% to 75%, depending on our leverage. Currently, the Credit Agreement would require a 75% excess cash flow payment. The Credit Agreement also contains certain restrictive covenants, including limitations on liens, mergers and consolidations, sales of assets, payment of dividends and indebtedness, but the Credit Agreement does not contain financial covenants.
	The original issue discount and the debt issuance costs have been accounted for as a reduction to the carrying value of the Term Loan on our Consolidated Balance Sheets and are being amortized to Interest expense in our Consolidated Statements of Operations over the contractual term, using the effective interest method.
	The carrying value of the Term Loan is reflected in our Consolidated Balance Sheets as follows:
	(In thousands)	April 4, 2015			March 29, 2015
	Principal amount	$	350,000		$	—
	Unamortized original issue discount and debt issuance costs	(11,500		)	—
	Less current portion of Long-term debt	(122		)	—
	Long-term debt	$	338,378		$	—
	Interest expense related to the Term Loan was included in Interest expense on the Consolidated Statements of Operations as follows:
		Three Months Ended
	(In thousands)	April 4, 2015			March 29, 2014
	Contractual interest	$	1,327		$	—
	Amortization of debt issuance costs and discount	284			—
	Total Interest expense related to the Term Loan	$	1,611		$	—

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Apr. 04, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation:
	Total stock-based compensation expense included in our Consolidated Statements of Operations was as follows:
		Three Months Ended
	(In thousands)	April 4, 2015		March 29, 2014
	Line item:
	Cost of products sold	$	240	$	166
	Research and development	1,509		1,034
	Selling, general and administrative	1,635		1,890
	Acquisition related charges	3,891		$	—
	Total stock-based compensation	$	7,275	$	3,090
	During the first quarter of 2015, we granted approximately 306,000 stock options with a market condition to certain executives. The options have a two year vesting and vest between 0% and 200% of the target amount, based on the Company's relative Total Shareholder Return (TSR) when compared to the TSR of a component of companies of the PHLX Semiconductor Sector Index over a two year period. The fair values of the options were determined and fixed on the date of grant using a lattice-based option-pricing valuation model, which incorporates a Monte-Carlo simulation, and considered the likelihood that we would achieve the market condition. TSR is a measure of stock price appreciation plus dividends paid, if any, in the performance period. As of April 4, 2015, 306,000 market-based stock options were outstanding. In the first quarter of 2015, we incurred stock compensation expense of $0.1 million related to these market condition awards.
	Total stock-based compensation for the first quarter 2015 was $7.3 million, of which $1.7 million was cashed out during the first quarter 2015 and $2.2 million was accrued in Accrued payroll obligations on the Consolidated Balance Sheets as of the end of the first quarter 2015, to be paid out subsequent to quarter-end.

Legal_Matters

Legal Matters	3 Months Ended
	Apr. 04, 2015
Legal Matters Disclosure [Abstract]
Legal Matters	Legal Matters
	On or about January 29, 2015, Silicon Image, members of its Board, the Company and the Company’s wholly-owned merger acquisition subsidiary, were named as defendants in two complaints filed in Santa Clara Superior Court by alleged stockholders of Silicon Image in connection with the proposed merger of Silicon Image and the Company. Both complaints were dated January 29, 2015 and were captioned respectively Molland v. George, et al. and Stein v. Silicon Image, Inc. et. al. Five additional complaints were subsequently filed on January 30, 2015, February 4, 2015 and February 9, 2015 in Delaware Chancery Court by alleged stockholders of Silicon Image, Inc. in connection with the Merger, captioned respectively Pfeiffer v. Martino et. al.; Lipinski v. Silicon Image, Inc. et. al.; Feldbaum et. al. v. Silicon Image, Inc. et. al; Nelson v. Silicon Image, Inc. et. al. and Partansky v. Silicon Image, Inc. et. al. The five Delaware matters were subsequently consolidated into an action captioned In re Silicon Image Stockholders Litigation by order of the Delaware Chancery Court on February 11, 2015, and a consolidated amended complaint was filed in the matter on February 13, 2015. Two complaints captioned Tapia v. Silicon Image, Inc. et. al. and Caldwel v. Silicon Image, Inc. were also filed on February 4, 2015 and February 9, 2015 in Santa Clara Superior Court by alleged stockholders in connection with the merger. Amended complaints were filed in the Molland and Stein actions on February 11, 2015. At this stage of the proceedings, we do not have an estimate of the likelihood or the amount of any potential exposure to the Company. We believe that we possess defenses to these claims and intend to vigorously defend this litigation. Currently, we are unable to estimate a potential range of loss, if any.
	Each of these lawsuits are purported class actions brought on behalf of Silicon Image stockholders, asserting claims against each member of the Board for breach of fiduciary duty, and against various of the Silicon Image, Silicon Image’s Board, the Company, and the Company’s wholly-owned merger subsidiary for aiding and abetting breach of fiduciary duty. The lawsuits allege that the Merger does not appropriately value Silicon Image, was the result of an inadequate process, and includes preclusive deal devices. The amended complaints also assert that the Silicon Image’s disclosures regarding the Merger in its Schedule 14D-9 omitted material information regarding the Merger. Each of these complaints purport to seek unspecified damages and may seek injunctive relief preventing consummation of the transactions. The parties have reached a tentative settlement agreement in the Delaware case, subject to court approval, which we consider to be immaterial to our Consolidated Statements of Operations. The California cases are ongoing but are subject to a motion to stay which will be heard on or about May 23, 2015.
	In November 2014, a patent infringement lawsuit was filed by Papst Licensing GmbH & Co., KG ("Papst") against us in the U.S. District Court for the District of Delaware. In the complaint, Papst alleges that certain of the simulator or simulation products sold by the Company may infringe one or more of the patents held by Papst. No discovery has been conducted with respect to these allegations. At this stage of the proceedings, we do not have an estimate of the likelihood or the amount of any potential exposure to the Company. We believe that we possess defenses to these claims and intend to vigorously defend this litigation. Currently, we are unable to estimate a potential range of loss, if any.
	In March 2014, the China National Development and Reform Commission ("NDRC") notified HDMI Licensing, LLC, a wholly-owned subsidiary of the Company and the agent for and entity charged with administering the HDMI specification, that the NDRC was investigating HDMI’s licensing activities in China under the Chinese Anti-Monopoly Law ("AML"). A broad range of remedies with respect to business practices deemed to violate the AML is potentially available to the NDRC, including but not limited to issuing an order to cease conduct deemed illegal, confiscating gains deemed illegally obtained, imposing a fine and requiring modifications to business practices. It is difficult to predict the outcome of this matter or what remedies, if any, may be imposed by the NDRC. The Company continues to cooperate with the NDRC as it conducts its investigation. HDMI Licensing, LLC and the Company will continue to defend themselves vigorously in the foregoing matter. However, litigation and administrative proceedings are inherently uncertain. Accordingly, the outcome of this matter cannot be predicted. At this stage of the proceedings, we do not have an estimate of the likelihood or the amount of any potential exposure to the Company.
	We are exposed to certain other asserted and unasserted potential claims. There can be no assurance that, with respect to potential claims made against us, we could resolve such claims under terms and conditions that would not have a material adverse effect on our business, our liquidity or our financial results. Periodically, we review the status of each significant matter and assess its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and a range of possible losses can be estimated, we then accrue a liability for the estimated loss based on the provisions of FASB ASC 450, “Contingencies" (“ASC 450”). Legal proceedings are subject to uncertainties, and the outcomes are difficult to predict. Because of such uncertainties, accruals are based only on the best information available at the time. As additional information becomes available, we reassess the potential liability related to pending claims and litigation and may revise estimates. Presently, no accrual has been estimated under ASC 450 for potential losses that may or may not arise from the current lawsuits in which we are involved.

Segment_and_Geographic_Informa

Segment and Geographic Information	3 Months Ended
	Apr. 04, 2015
Segment Reporting [Abstract]
Segment and Geographic Information	Segment and Geographic Information:
	Lattice has two operating segments: the core Lattice ("Core") business, which includes intellectual property and semiconductor devices, and Qterics, a discrete software-as-a-service business unit in the Lattice legal entity structure. Although these two operating segments constitute two reportable segments, we combine Qterics with our Core business and report them together as one reportable segment due to the immaterial nature of the Qterics segment.
	Our revenue by major geographic area, based on ship-to location, was as follows:
		Three Months Ended
	(In thousands)	April 4, 2015				March 29, 2014
	Asia	$	62,534	70	%	$	72,744	75	%
	Europe	16,467		19		14,710		15
	Americas	9,596		11		9,183		10
	Total revenue	$	88,597	100	%	$	96,637	100	%

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Apr. 04, 2015
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation
	The accompanying Consolidated Financial Statements include the accounts of Lattice and its subsidiaries after the elimination of all intercompany balances and transactions.
Cash Equivalents	We consider all investments that are readily convertible into cash and have original maturities of three months or less to be cash equivalents. Cash equivalents consist primarily of highly liquid investments in time deposits or money market accounts and are carried at cost.
Marketable Securities	We account for marketable securities as available-for-sale investments, as defined by U.S. GAAP, and record unrealized gains or losses to Accumulated other comprehensive loss on our Consolidated Balance Sheets, unless losses are considered other than temporary, in which case, those are recorded directly to the Consolidated Statements of Operations and Statements of Comprehensive (Loss) Income.
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	We invest in various financial instruments including corporate and government bonds, notes and commercial paper. In the past we have also invested in auction rate securities. We valued these instruments at their fair value and monitored the portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other than temporary, we record an impairment charge and establishes a new carrying value. We assess other than temporary impairment of marketable securities in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 820, “Fair Value Measurements.” The framework under the provisions of ASC 820 establishes three levels of inputs that may be used to measure fair value. Each level of input has different levels of subjectivity and difficulty involved in determining fair value.
Foreign Exchange and Translation of Foreign Currencies	Foreign Exchange and Translation of Foreign Currencies
	We have international subsidiary and branch operations. In addition, a portion of our silicon wafer and other purchases are denominated in Japanese yen, we bill certain Japanese customers in yen and collect a Japanese consumption tax refund in yen. Gains or losses from foreign exchange rate fluctuations on balances denominated in foreign currencies are reflected in Other (expense) income, net. Realized and unrealized gains or losses on foreign currency transactions were not significant for the periods presented. We translate accounts denominated in foreign currencies in accordance with ASC 830, “Foreign Currency Matters,” using the current rate method under which asset and liability accounts are translated at the current rate, while stockholders' equity accounts are translated at the appropriate historical rates, and revenue and expense accounts are translated at average monthly exchange rates. Translation adjustments related to the consolidation of foreign subsidiary financial statements are reflected in Accumulated other comprehensive loss in Stockholders' equity.
Derivative Financial Instruments	Derivative Financial Instruments
	We mitigate foreign currency exchange rate risk by entering into foreign currency forward exchange contracts. At April 4, 2015 and January 3, 2015, we had open foreign exchange contracts of $5.6 million and $4.2 million, respectively. Two contracts outstanding at April 4, 2015 which settled in April 2015; six contracts will settle in June 2015 and two will settle in June 2016. Although these hedges mitigate our foreign currency exchange rate exposure from an economic perspective, they were not designated as "effective" hedges under GAAP and as such are adjusted to fair value through Other (expense) income, net, with an impact of less than $0.5 million for the periods reported in the Consolidated Statements of Operations. We do not hold or issue derivative financial instruments for trading or speculative purposes.
Concentration Risk	Concentration Risk
	Potential exposure to concentration risk consists primarily of revenue, cash and cash equivalents, marketable securities, trade receivables and supply of wafers for our new products.
	Our top five end customers constituted approximately 35% of our revenue for the first quarter of fiscal 2015, compared to approximately 51% for the first quarter of fiscal 2014.
	Our two largest end customers accounted for approximately 10% each of total revenue in the first quarter of fiscal 2015 and 23% and 14% of total revenue in the first quarter of fiscal 2014. No other customers accounted for more than 10% in either quarter.
	Concentration of credit risk with respect to trade receivables is mitigated by our credit and collection process including active management of collections, credit limits, routine credit evaluations for essentially all customers and secure transactions with letters of credit or advance payments where appropriate. Accounts receivable do not bear interest and are shown net of allowances for doubtful accounts of $0.9 million and $0.9 million at April 4, 2015 and January 3, 2015, respectively. We regularly review our allowance for doubtful accounts and the aging of our accounts receivable. Write-offs for uncollected trade receivables have not been significant to date.
	We place our investments primarily through two financial institutions and mitigate the concentration of credit risk by limiting the maximum portion of the investment portfolio which may be invested in any one instrument. Our investment policy defines approved credit ratings for investment securities. Investments on-hand in marketable securities consisted primarily of money market instruments, “AA” or better corporate notes and bonds and commercial paper, and U.S. government agency obligations. See Note 5 for a discussion of the liquidity attributes of our marketable securities.
	We rely on a limited number of foundries for our wafer purchases including Fujitsu Limited, Seiko Epson Corporation, Taiwan Semiconductor Manufacturing Company, Ltd, and United Microelectronics Corporation.
Revenue Recognition and Deferred Income	Revenue Recognition and Deferred Income
	We sell our products directly to end customers, through a network of independent manufacturers' representatives, and indirectly through a network of independent sell-in and sell-through distributors. Distributors provide periodic data regarding the product, price, quantity, and end customer when products are resold, as well as the quantities of our products they still have in stock.
	Revenue from sales to original equipment manufacturers ("OEMs") and sell-in distributors is generally recognized upon shipment. Reserves for sell-in stock rotations, where applicable, are estimated based primarily on historical experience and provided for at the time of shipment. Revenue from sales by our sell-through distributors is recognized at the time of reported resale. Under both types of revenue recognition, persuasive evidence of an arrangement exists, the price is fixed or determinable, title has transferred, collection of resulting receivables is reasonably assured, and there are no remaining customer acceptance requirements and no remaining significant performance obligations.
	Orders from our sell-through distributors are initially recorded at published list prices; however, for a majority of our sales, the final selling price is determined at the time of resale and in accordance with a distributor price agreement. In certain circumstances, we allow sell-through distributors to return unsold products. At times, we protect our sell-through distributors against reductions in published list prices. For these reasons, we do not recognize revenue until products are resold by sell-through distributors to an end customer.
	For sell-through distributors, at the time of shipment to distributors, we (a) record Accounts receivable at published list price since there is a legally enforceable obligation from the distributor to pay us currently for product delivered, (b) relieve inventory for the carrying value of goods shipped since legal title has passed to the distributor, and (c) record deferred revenue and deferred cost of sales in Deferred income and allowances on sales to sell-through distributors in the liability section of our Consolidated Balance Sheets. The final price is set at the time of resale and is determined in accordance with a distributor price agreement. Revenue and cost of sales to sell-through distributors are deferred until either the product is resold by the distributor or, in certain cases, return privileges terminate, at which time Revenue and Cost of products sold are reflected in Net (loss) income, and Accounts receivable, net are adjusted to reflect the final selling price.
	A significant portion of our revenue in the first quarter of fiscal 2015 was from sell-through distributors. Resale of products by sell-through distributors as a percentage of total revenue was 48% for the three months ended April 4, 2015, and 39% for the three months ended March 29, 2014.
	We must use estimates and apply judgment to reconcile sell-through distributors' reported inventories to their activities. Errors in our estimates or judgments could result in inaccurate reporting of our Revenue, Cost of products sold, Deferred income and allowances on sales to sell-through distributors, and Net (loss) income.
	Licensing and Services Revenue
	Our licensing and services revenue is comprised of revenue from our intellectual property ("IP") core licensing activity, patent monetization activities, device management system and remote support services and royalty and adopter fee revenue from our standards activities. These activities are complementary to our product sales and help us monetize our intellectual property and accelerate market adoption curves associated with our technology and standards.
	We enter into IP licensing agreements that generally provide licensees the right to incorporate the Company’s IP components in their products pursuant to terms and conditions that vary by licensee. Revenue earned under these agreements is classified as licensing revenue. Our IP licensing agreements generally include multiple elements, which may include one or more off-the-shelf or customized IP licenses bundled with support services covering a fixed period of time, generally one year. If the different elements of a multiple-element arrangement qualify as separate units of accounting, we allocate the total arrangement consideration to each element based on relative selling price.
	Amounts allocated to off-the-shelf IP licenses are recognized at the time of sale provided the other conditions for revenue recognition have been met. Amounts allocated to the support services are deferred and recognized on a straight-line basis over the support period, generally one year. Certain licensing agreements provide for royalty payments based on agreed upon royalty rates, which may be fixed or variable depending on the terms of the agreement. The amount of revenue we recognize is based on a specified time period or on the agreed-upon royalty rate multiplied by the number of units shipped by the customer.
	From time to time, we enter into IP licensing agreements that involve significant modification, customization or engineering services. Revenues derived from these contracts are accounted for using the percentage-of-completion method or completed contract method. The completed contract method is used for contracts where there is a risk of final acceptance by the customer or for short-term contracts. HDMI royalty revenue is determined by a contractual allocation formula agreed to by the members ("Founders") of the HDMI consortium. Evidence of an arrangement, as to HDMI royalty revenue, is deemed complete when all of the Founders agree on the royalty sharing formula.
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and classification of assets, such as marketable securities, accounts receivable, inventory, goodwill (including the assessment of reporting unit), intangible assets, current and deferred income taxes, accrued liabilities (including restructuring charges and bonus arrangements), deferred income and allowances on sales to sell-through distributors, disclosure of contingent assets and liabilities at the date of the financial statements, anticipated amounts used in acquisition valuations and purchase accounting, and the reported amounts of revenue and expenses during the fiscal periods presented. Actual results could differ from those estimates.
New Accounting Pronouncements	New Accounting Pronouncements:
	In April 2014, the FASB issued Accounting Standards Update ("ASU") No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for reporting discontinued operations to only those disposals which represent a strategic shift in operations. In addition, the new guidance requires expanded disclosures about discontinued operations, including pre-tax income attributable to a disposal of a significant part of an organization that does not qualify for discontinued operations reporting. The new standard became effective for us on January 4, 2015 and did not have a material impact on our consolidated financial statements.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance under U.S. GAAP when it becomes effective. The new standard will become effective for us on January 1, 2017. Early adoption is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. We are currently evaluating the impact of ASU 2014-09 on our consolidated financial statements and related disclosures and have not yet selected a transition method. In April 2015, the FASB proposed a one year deferral of the effective date with early adoption permitted for annual reporting periods beginning after December 15, 2016, and interim periods within that year.
	In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which focuses on the consolidation evaluation for reporting organizations and requires the evaluation of whether or not certain legal entities should be consolidated. All legal entities are subject to reevaluation under the revised consolidation model. The new standard will become effective for us on January 3, 2016. Early adoption is permitted, including adoption in an interim period. We do not expect the adoption of this accounting standard update to impact our consolidated financial statements.
	In April 2015, the FASB issued ASU No. 2015-03, "Simplifying the Presentation of Debt Issuance Cost". The ASU requires debt issuance costs associated with a recognized debt liability to be presented on the balance sheet as a direct deduction from the carrying amount of the corresponding debt liability. This new guidance is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. An entity should apply the new guidance on a retrospective basis. We adopted this ASU effective with this filing for the first quarter of fiscal year 2015.

Basis_of_Presentation_and_Sign2

Basis of Presentation and Significant Accounting Policies (Tables)	3 Months Ended
	Apr. 04, 2015
Accounting Policies [Abstract]
Deferred Income and Allowances on Sales to Sell-through Distributors	The components of Deferred income and allowances on sales to sell-through distributors are presented in the following table:
	(In thousands)	April 4,			January 3,
		2015			2015
	Inventory valued at published list price and held by sell-through distributors with right of return	$	56,489		$	50,854
	Allowance for distributor advances	(30,440		)	(29,490		)
	Deferred cost of sales related to inventory held by sell-through distributors	(6,463		)	(6,418		)
	Total Deferred income and allowances on sales to sell-through distributors	$	19,586		$	14,946

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	3 Months Ended
	Apr. 04, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Reconciliation	A reconciliation of basic and diluted Net (loss) income per share is presented below:
		Three Months Ended
	(in thousands, except per share data)	April 4, 2015			March 29, 2014
	Basic and diluted Net (loss) income	$	(53,347	)	$	11,984
	Shares used in basic Net (loss) income per share	116,863			116,436
	Dilutive effect of stock options, RSUs and ESPP shares	—			2,481
	Shares used in diluted Net (loss) income per share	116,863			118,917
	Basic Net (loss) income per share	$	(0.46	)	$	0.1
	Diluted Net (loss) income per share	$	(0.46	)	$	0.1

Marketable_Securities_Tables

Marketable Securities (Tables)	3 Months Ended
	Apr. 04, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of Contractual Maturities of Marketable Securities	The following table summarizes the remaining maturities of our marketable securities at fair value:
	(In thousands)	April 4,		January 3,
		2015		2015
	Short-term marketable securities:
	Maturing within one year	$	17,635	$	60,965
	Maturing between one and two years	22,492		78,268
	Total marketable securities	$	40,127	$	139,233
Schedule of Composition of Marketable Securities	The following table summarizes the composition of our marketable securities at fair value:
	(In thousands)	April 4,		January 3,
		2015		2015
	Short-term marketable securities:
	Corporate and government bonds and notes and commercial paper	$	34,498	$	139,233
	Certificates of deposit	5,629		—
	Total marketable securities	$	40,127	$	139,233

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Apr. 04, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Financial Instruments
		Fair value measurements as of								Fair value measurements as of
		4-Apr-15								January 3, 2015
	(In thousands)	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
	Short-term marketable securities	$	40,127	$	34,498	$	5,629	$	—	$	139,233	$	139,233	$	—	$	—
	Foreign currency forward exchange contracts, net	339		—		339		—		414		—		414		—
	Total fair value of financial instruments	$	40,466	$	34,498	$	5,968	$	—	$	139,647	$	139,233	$	414	$	—
Schedule of Changes In Level 3 Instruments	During the three months ended April 4, 2015 and March 29, 2014, the following changes occurred in our Level 3 instruments:
		Three Months Ended
	(In thousands)	April 4,		March 29,
		2015		2014
	Beginning fair value of Long-term marketable securities	$	—	$	5,241
	Fair value of securities sold or redeemed	—		—
	Ending fair value of Long-term marketable securities	$	—	$	5,241

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Apr. 04, 2015
Inventory Disclosure [Abstract]
Schedule of Inventories
	(In thousands)	April 4,		3-Jan-15
		2015
	Work in progress	$	58,236	$	49,554
	Finished goods	22,319		15,371
	Total inventories	$	80,555	$	64,925

Business_Combinations_and_Good1

Business Combinations and Goodwill (Tables)	3 Months Ended
	Apr. 04, 2015
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The preliminary fair value of the purchase price consideration consisted of the following:
	(In thousands)	Estimated Fair Value
	Cash paid to Silicon Image stockholders	$	575,955
	Cash paid for options and restricted stock units	2,205
	Accrual for options and restricted stock units	5,178
	Fair value of partially vested assumed equity awards	5,139
	Total purchase consideration	$	588,477
	Our preliminary allocation of the total purchase price is as follows:
	(In thousands)	Estimated Fair Value
	Assets acquired:
	Cash, cash equivalents and short-term investments	$	157,923
	Accounts receivable	30,677
	Inventory	20,839
	Other current assets	7,183
	Property, plant and equipment	23,429
	Other non-current assets	1,573
	Intangible assets	192,079
	Goodwill	223,890
	Total assets acquired	657,593
	Liabilities assumed
	Accounts payable and other accrued liabilities	46,350
	Other current liabilities	1,252
	Long-term liabilities	14,342
	Redeemable noncontrolling interest	7,172
	Total liabilities assumed	69,116
	Fair value of net assets acquired	$	588,477
	The following table presents details of the identified intangible assets acquired through the acquisition of Silicon Image:
	(In thousands)	Asset Life in Years		Fair Value
	Developed technology	5-Mar		$	125,000
	Customer relationships	7-Apr		29,458
	Licensed technology	5-Mar		1,852
	Patents	5		769
	Total identified finite-lived intangible assets			157,079
	In-process research and development	indefinite		35,000
	Total identified intangible assets			$	192,079
Business acquisition, pro forma information	The unaudited pro forma financial information for the three months ended March 29, 2014 combined the historical results of the Company for the three months ended March 29, 2014, the historical results of Silicon Image for the three months ended March 29, 2014, and the effects of the pro forma adjustments described above.
			Three Months Ended
	(Dollars in thousands, except per share amounts)		April 4, 2015			March 29, 2014
	Total revenues		$	133,498		$	158,198
	Net loss attributable to common stockholders		$	(48,288	)	$	(28,241	)
	Basic net loss per share		$	(0.41	)	$	(0.24	)
	Diluted net loss per share		$	(0.41	)	$	(0.24	)

Intangible_Assets_Tables

Intangible Assets (Tables)	3 Months Ended
	Apr. 04, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Acquired Finite-lived Intangible Assets by Major Class	The following table summarizes the details of our total purchased intangible assets:
	(In thousands)		Weighted Average Amortization Period (in years)	Gross			Accumulated Amortization			Intangible assets, net of amortization April 4, 2015
	Developed technology		4.7	$	135,700		$	(6,873	)	$	128,827
	Customer relationships		5.5	37,258			(5,032		)	32,226
	Licensed technology		2.5	1,852			(50		)	1,802
	Patents		5	769			(11		)	758
	Total identified finite-lived intangible assets			175,579			(11,966		)	163,613
	In-process research and development		indefinite	35,000			—			35,000
	Total identified intangible assets			$	210,579		$	(11,966	)	$	198,613
Schedule of Acquired Indefinite-lived Intangible Assets by Major Class	The following table summarizes the details of our total purchased intangible assets:
	(In thousands)		Weighted Average Amortization Period (in years)	Gross			Accumulated Amortization			Intangible assets, net of amortization April 4, 2015
	Developed technology		4.7	$	135,700		$	(6,873	)	$	128,827
	Customer relationships		5.5	37,258			(5,032		)	32,226
	Licensed technology		2.5	1,852			(50		)	1,802
	Patents		5	769			(11		)	758
	Total identified finite-lived intangible assets			175,579			(11,966		)	163,613
	In-process research and development		indefinite	35,000			—			35,000
	Total identified intangible assets			$	210,579		$	(11,966	)	$	198,613
Finite-lived Intangible Assets Amortization Expense	We recorded amortization expense on the Consolidated Statements of Operations as follows:
		Three Months Ended
	(In thousands)	4-Apr-15			29-Mar-14
	Research and development	$	61		$	—
	Amortization of acquired intangible assets	2,942			737
		$	3,003		$	737
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The annual expected amortization expense of acquired intangible assets with finite lives is as follows:
	(In thousands)	Amount
	2015 (remaining 9 months)	$	27,491
	2016	36,452
	2017	35,635
	2018	29,752
	Thereafter	34,283
	Total	$	163,613

Changes_in_Stockholders_Equity1

Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Apr. 04, 2015
Stockholders' Equity Note [Abstract]
Schedule of Changes in Stockholders' Equity and Accumulated other Comprehensive Loss	Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss:
	(In thousands)	Common			Additional Paid-in			Treasury			Accumulated			Accumulated			Total
		stock			capital			stock			deficit			other
														comprehensive
														loss
	Balances, January 3, 2015	$	1,173		$	635,299		$	—		$	(193,613	)	$	(1,884	)	$	440,975
	Net loss attributable to common stockholders for the three months ended April 4, 2015	—			—			—			(53,347		)	—			(53,347		)
	Unrealized loss related to marketable securities, net	—			—			—			—			(20		)	(20		)
	Recognized loss on redemption of marketable securities, previously unrealized	—			—			—			—			288			288
	Translation adjustments	—			—			—			—			(6		)	(6		)
	Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	4			(264		)	—			—			—			(260		)
	Stock repurchase	—			—			(6,993		)	—			—			(6,993		)
	Retirement of treasury stock	(8		)	(5,601		)	5,609			—			—			—
	Stock-based compensation expense related to stock options, ESPP and RSUs	—			3,384			—			—			—			3,384
	Fair value of stock options and RSUs assumed in business acquisition	—			5,139			—			—			—			5,139
	Defined benefit pension net actuarial losses	—			—			—			—			(157		)	(157		)
	Other	—			(51		)	—			—			—			(51		)
	Balances, April 4, 2015	$	1,169		$	637,906		$	(1,384	)	$	(246,960	)	$	(1,779	)	$	388,952

Restructuring_Tables

Restructuring (Tables)	3 Months Ended
	Apr. 04, 2015
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following table displays the activity related to restructuring:
	(In thousands)	Severance and related			Lease Terminations, Outside Services and Facilities			Other			Total
	Balance at December 28, 2013	$	17		$	368		$	147		$	532
	Restructuring Charges	—			—			9			9
	Cash Payments	(8		)	(266		)	(16		)	(290		)
	Adjustments to prior restructuring costs	(9		)	11			—			2
	Balance at March 29, 2014	$	—		$	113		$	140		$	253
	Balance at January 3, 2015	$	—		$	43		$	139		$	182
	Restructuring Charges	4,893			—			—			4,893
	Cash Payments	—			(9		)	(139		)	(148		)
	Adjustments to prior restructuring costs	—			1			—			1
	Balance at April 4, 2015	$	4,893		$	35		$	—		$	4,928

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Apr. 04, 2015
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The carrying value of the Term Loan is reflected in our Consolidated Balance Sheets as follows:
	(In thousands)	April 4, 2015			March 29, 2015
	Principal amount	$	350,000		$	—
	Unamortized original issue discount and debt issuance costs	(11,500		)	—
	Less current portion of Long-term debt	(122		)	—
	Long-term debt	$	338,378		$	—
Interest Income and Interest Expense Disclosure	Interest expense related to the Term Loan was included in Interest expense on the Consolidated Statements of Operations as follows:
		Three Months Ended
	(In thousands)	April 4, 2015			March 29, 2014
	Contractual interest	$	1,327		$	—
	Amortization of debt issuance costs and discount	284			—
	Total Interest expense related to the Term Loan	$	1,611		$	—

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Apr. 04, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock-Based Compensation Expense	Total stock-based compensation expense included in our Consolidated Statements of Operations was as follows:
		Three Months Ended
	(In thousands)	April 4, 2015		March 29, 2014
	Line item:
	Cost of products sold	$	240	$	166
	Research and development	1,509		1,034
	Selling, general and administrative	1,635		1,890
	Acquisition related charges	3,891		$	—
	Total stock-based compensation	$	7,275	$	3,090

Segment_and_Geographic_Informa1

Segment and Geographic Information (Tables)	3 Months Ended
	Apr. 04, 2015
Segment Reporting [Abstract]
Schedule of Revenue by Major Geographic Area	Our revenue by major geographic area, based on ship-to location, was as follows:
		Three Months Ended
	(In thousands)	April 4, 2015				March 29, 2014
	Asia	$	62,534	70	%	$	72,744	75	%
	Europe	16,467		19		14,710		15
	Americas	9,596		11		9,183		10
	Total revenue	$	88,597	100	%	$	96,637	100	%

Basis_of_Presentation_and_Sign3

Basis of Presentation and Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Jan. 03, 2015
	Contract
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative, Number of Instruments Held	2
Gain on foreign exchange contracts adjusted to fair value through earnings - less than	$500,000
Risks and Uncertainties [Abstract]
Allowance for doubtful accounts	900,000		900,000
Deferred Revenue and Credits [Abstract]
Inventory valued at published list price and held by sell-through distributors with right of return	56,489,000		50,854,000
Allowance for distributor advances	-30,440,000		-29,490,000
Deferred cost of sales related to inventory held by sell-through distributors	-6,463,000		-6,418,000
Total Deferred income and allowances on sales to sell-through distributors	19,586,000		14,946,000
Revenue | Customer Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk	35.00%	51.00%
Sales Revenue | Sell-Through Distributors
Risks and Uncertainties [Abstract]
Concentration Risk	48.00%	39.00%
Derivative One [Member]
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative, Number of Instruments Held	6
Derivative Two [Member]
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative, Number of Instruments Held	2
Not designated as effective hedges for accounting purposes | Foreign exchange contracts
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Open foreign exchange contracts - notional amounts	$5,551,000		$4,200,000
Minimum
Basis of Presentation and Significant Accounting Policies [Line Items]
Fiscal year duration (52 weeks or 53 weeks)	364 days
Maximum
Basis of Presentation and Significant Accounting Policies [Line Items]
Fiscal year duration (52 weeks or 53 weeks)	371 days
Term of maturities of investments considered cash and cash equivalents	3 months
Customer A | Revenue | Customer Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk	10.00%	23.00%
Customer B | Revenue | Customer Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk		14.00%

Net_Income_Per_Share_Details

Net Income Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
Earnings Per Share [Abstract]
Basic and diluted Net (loss) income	($53,347)	$11,984
Shares used in basic Net (loss) income per share (in shares)	116,863,000	116,436,000
Dilutive effect of stock options, RSUs and ESPP shares (in shares)	0	2,481,000
Shares used in diluted Net (loss) income per share (in shares)	116,863,000	118,917,000
Basic Net (loss) income per share (in dollars per share)	($0.46)	$0.10
Diluted Net (loss) income per share (in dollars per share)	($0.46)	$0.10
Stock options, RSU's and ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)	11,500,000	5,300,000

Marketable_Securities_Composit

Marketable Securities Composition (Details) (USD $)	Apr. 04, 2015	Jan. 03, 2015
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Total marketable securities	$40,127	$139,233
Short-term marketable securities
Schedule of Available-for-sale Securities [Line Items]
Maturing within one year	17,635	60,965
Maturing between one and two years	22,492	78,268
Total marketable securities	40,127	139,233
Corporate and Government Bonds and Notes and Commercial Paper [Member] | Short-term marketable securities
Schedule of Available-for-sale Securities [Line Items]
Total marketable securities	34,498	139,233
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Short-term marketable securities
Schedule of Available-for-sale Securities [Line Items]
Total marketable securities	$5,629	$0

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Jun. 28, 2014	Jan. 03, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	$40,127,000			$139,233,000
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	339,000			414,000
Total fair value of financial instruments	40,466,000			139,647,000
Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	40,127,000			139,233,000
Short-term marketable securities | Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	40,127,000			139,233,000
Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	0			0
Total fair value of financial instruments	34,498,000			139,233,000
Level 1 | Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	34,498,000			139,233,000
Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	339,000			414,000
Total fair value of financial instruments	5,968,000			414,000
Level 2 | Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	5,629,000			0
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	0			0
Total fair value of financial instruments	0			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	0
Level 3 | Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	0			0
Federally-insured or FFELP guaranteed student loan auction rate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Par value			5,700,000
Federally-insured or FFELP guaranteed student loan auction rate securities | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			$5,200,000

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments Unobservable Inputs (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Short-term marketable securities | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss)- less than	$100,000	($100,000)
Fair Value, Inputs, Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning fair value of Long-term marketable securities	0	5,241,000
Fair value of securities sold or redeemed	0	0
Ending fair value of Long-term marketable securities	$0	$5,241,000

Inventories_Details

Inventories (Details) (USD $)	Apr. 04, 2015	Jan. 03, 2015
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Work in progress	$58,236	$49,554
Finished goods	22,319	15,371
Total inventories	$80,555	$64,925

Business_Combinations_and_Good2

Business Combinations and Goodwill (Acquisition Silicon Image) (Details) (Silicon Image, Inc, USD $)	0 Months Ended
In Thousands, unless otherwise specified	Mar. 10, 2015
Silicon Image, Inc
Business Combination, Consideration Transferred [Abstract]
Cash paid to Silicon Image stockholders	$575,955
Cash paid for options and restricted stock units	2,205
Accrual for options and restricted stock units	5,178
Fair value of partially vested assumed equity awards	5,139
Total purchase consideration	$588,477

Business_Combinations_and_Good3

Business Combinations and Goodwill (Allocation of the Purchase Price) (Details) (USD $)	Apr. 04, 2015	Jan. 03, 2015	Mar. 10, 2015
In Thousands, unless otherwise specified
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$268,698	$44,808
Silicon Image, Inc
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash, cash equivalents and short-term investments			157,923
Accounts receivable			30,677
Inventory			20,839
Other current assets			7,183
Property, plant and equipment			23,429
Other assets			1,573
Intangible assets			192,079
Goodwill			223,890
Total assets acquired			657,593
Accounts payable and other accrued liabilities			46,350
Other current liabilities			1,252
Long-term liabilities			14,342
Redeemable noncontrolling interest			7,172
Total liabilities assumed			69,116
Fair value of net assets acquired			$588,477

Business_Combinations_and_Good4

Business Combinations and Goodwill (Identified Intangible Assets Acquired) (Details) (Silicon Image, Inc, USD $)	0 Months Ended
In Thousands, unless otherwise specified	Mar. 10, 2015	Mar. 10, 2015
Allocation of purchase price to assets acquired based on fair values:
Total identified finite-lived intangible assets	$157,079	$157,079
Total identified intangible assets	192,079	192,079
Developed technology
Allocation of purchase price to assets acquired based on fair values:
Total identified finite-lived intangible assets	125,000	125,000
Customer relationships
Allocation of purchase price to assets acquired based on fair values:
Total identified finite-lived intangible assets	29,458	29,458
Licensing Agreements
Allocation of purchase price to assets acquired based on fair values:
Total identified finite-lived intangible assets	1,852	1,852
Patents
Allocation of purchase price to assets acquired based on fair values:
Total identified finite-lived intangible assets	769	769
Asset Life in Years	5 years
In Process Research and Development [Member]
Allocation of purchase price to assets acquired based on fair values:
In-process research and development	$35,000	$35,000
Minimum | Developed technology
Allocation of purchase price to assets acquired based on fair values:
Asset Life in Years	3 years
Minimum | Customer relationships
Allocation of purchase price to assets acquired based on fair values:
Asset Life in Years	4 years
Minimum | Licensing Agreements
Allocation of purchase price to assets acquired based on fair values:
Asset Life in Years	3 years
Maximum | Developed technology
Allocation of purchase price to assets acquired based on fair values:
Asset Life in Years	5 years
Maximum | Customer relationships
Allocation of purchase price to assets acquired based on fair values:
Asset Life in Years	7 years
Maximum | Licensing Agreements
Allocation of purchase price to assets acquired based on fair values:
Asset Life in Years	5 years

Business_Combinations_and_Good5

Business Combinations and Goodwill Pro Forma Financial Information (Details) (Silicon Image, Inc, USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
Silicon Image, Inc
Business Acquisition [Line Items]
Total revenues	$133,498	$158,198
Net loss attributable to common stockholders	($48,288)	($28,241)
Basic net loss per share	($0.41)	($0.24)
Diluted net loss per share	($0.41)	($0.24)

Business_Combinations_and_Good6

Business Combinations and Goodwill (Narrative) (Details) (USD $)	3 Months Ended		1 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Apr. 04, 2015	Jan. 03, 2015	Mar. 10, 2015
Business Acquisition [Line Items]
Goodwill and Intangible Asset Impairment	$0	$0
Goodwill	268,698,000		268,698,000	44,808,000
Silicon Image, Inc
Business Acquisition [Line Items]
Total revenues	133,498,000	158,198,000
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			12,000,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			14,800,000
Business Combination, Acquisition Related Costs			8,000,000
Goodwill					223,890,000
Scenario, Adjustment [Member] | Silicon Image, Inc
Business Acquisition [Line Items]
Total revenues	($26,300,000)	$26,300,000

Intangible_Assets_Intangible_A

Intangible Assets (Intangible Assets) (Details) (USD $)	0 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Mar. 10, 2015	Apr. 04, 2015	Jan. 03, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Total		163,613
Intangible Assets, Net (Excluding Goodwill)		198,613	9,537
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross		175,579
Accumulated Amortization		-11,966
Total		163,613
Intangible Assets, Gross (Excluding Goodwill)		210,579
Intangible Assets, Net (Excluding Goodwill)		198,613
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	4 years 8 months 12 days
Gross		135,700
Accumulated Amortization		-6,873
Total		128,827
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	5 years 6 months
Gross		37,258
Accumulated Amortization		-5,032
Total		32,226
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Licensing Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	2 years 6 months
Gross		1,852
Accumulated Amortization		-50
Total		1,802
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	5 years
Gross		769
Accumulated Amortization		-11
Total		758
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Minimum | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)		3 years
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Minimum | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)		4 years
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Minimum | Licensing Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)		3 years
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Maximum | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)		7 years
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Maximum | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)		7 years
SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member] | Maximum | Licensing Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)		5 years
In Process Research and Development [Member] | SiliconBlue Technologies Ltd. and Silicon Image, Inc [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)		35,000

Intangible_Assets_Amortization

Intangible Assets (Amortization Expense) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$2,942	$737
SiliconBlue Technologies Ltd. and Silicon Image, Inc
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	3,003	737
Research and development | SiliconBlue Technologies Ltd. and Silicon Image, Inc
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$61	$0

Intangible_Assets_Intangible_A1

Intangible Assets (Intangible Assets, Amortization Expense) (Details) (USD $)	Apr. 04, 2015
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015 (remaining 9 months)	$27,491
2016	36,452
2017	35,635
2018	29,752
Thereafter	34,283
Total	$163,613

Changes_in_Stockholders_Equity2

Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended		12 Months Ended
Share data in Millions, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014	Jan. 03, 2015	Mar. 03, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$440,975,000
Net (loss) income	-53,347,000	11,984,000
Unrealized loss related to marketable securities, net	-20,000	-51,000
Recognized loss on redemption of marketable securities, previously unrealized	288,000	-9,000
Translation adjustments	-6,000	-176,000
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	-260,000
Stock repurchase	-6,993,000
Treasury Stock, Retired, Cost Method, Amount	0
Stock-based compensation expense related to stock options, ESPP and RSUs	3,384,000
Fair value of stock options and RSUs assumed in business acquisition	5,139,000
Defined benefit pension net actuarial losses	157,000	0
Other	51,000
Ending balance	388,952,000
Shares repurchased (in shares)	1.1
Share Repurchase Program approved on Feb 27, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares repurchased (in shares)			1.9
Shares repurchased	7,000,000		13,100,000
Share Repurchase Program approved on Feb 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchase program, authorized amount				20,000,000
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,173,000
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	4,000
Treasury Stock, Retired, Cost Method, Amount	-8,000
Ending balance	1,169,000
Additional Paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	635,299,000
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	-264,000
Treasury Stock, Retired, Cost Method, Amount	-5,601,000
Stock-based compensation expense related to stock options, ESPP and RSUs	3,384,000
Fair value of stock options and RSUs assumed in business acquisition	5,139,000
Other	-51,000
Ending balance	637,906,000
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0
Stock repurchase	-6,993,000
Treasury Stock, Retired, Cost Method, Amount	5,609,000
Ending balance	-1,384,000
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	-193,613,000
Net (loss) income	-53,347,000
Ending balance	-246,960,000
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	-1,884,000
Unrealized loss related to marketable securities, net	-20,000
Recognized loss on redemption of marketable securities, previously unrealized	288,000
Translation adjustments	-6,000
Defined benefit pension net actuarial losses	-157,000
Other	0
Ending balance	($1,779,000)

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax expense	$24,665,000	$1,727,000
Income Tax Examination, Estimate of Possible Loss	14,100,000
Unrecognized Tax Benefits, Remaining, not subject to examination, lapse of applicable statute of limitations	1,100,000
Lapse of the statute of limitations on foreign tax filings
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits that could significantly change during the next twelve months	15,200,000
Total potential decrease in UTB	15,200,000
Maximum | Lapse of the statute of limitations on foreign tax filings
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits, associated interest and penalties that could significantly change within the next twelve months	$100,000
U.S. Federal
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Statutory income tax rate	35.00%

Restructuring_Details

Restructuring (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Mar. 30, 2013
Restructuring Cost and Reserve [Line Items]
Recorded restructuring charges - less than	$4,894,000	$11,000
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	182,000	532,000
Restructuring Charges	4,893,000	9,000
Cash Payments	-148,000	-290,000
Adjustments to prior restructuring costs	1,000	2,000
Balance at the end of the period	4,928,000	253,000
Severance and related
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	0	17,000
Restructuring Charges	4,893,000	0
Cash Payments	0	-8,000
Adjustments to prior restructuring costs	0	-9,000
Balance at the end of the period	4,893,000	0
Lease termination
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	43,000	368,000
Restructuring Charges	0	0
Cash Payments	-9,000	-266,000
Adjustments to prior restructuring costs	1,000	11,000
Balance at the end of the period	35,000	113,000
Other
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	139,000	147,000
Restructuring Charges	0	9,000
Cash Payments	-139,000	-16,000
Adjustments to prior restructuring costs	0	0
Balance at the end of the period	0	140,000
2012 restructuring plan
Restructuring Cost and Reserve [Line Items]
Recorded restructuring charges - less than			4,900,000
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	20,000,000
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$25,000,000

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Mar. 10, 2015
Debt Instrument [Line Items]
Net proceeds from issuance of long-term debt	$346,500,000	$0
Line of Credit | Term Loan
Debt Instrument [Line Items]
Debt Instrument, Face Amount	350,000,000	0	350,000,000
Net proceeds from issuance of long-term debt	346,500,000
Debt Instrument, Unamortized Discount	11,500,000	0	3,500,000
Debt Issuance Cost			8,300,000
Debt Instrument, Interest Rate, Effective Percentage			6.16%
Debt Instrument, Periodic Payment	$900,000
Debt Instrument, Payment, Percentage	0.00%
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum			1.00%
Debt Instrument, Basis Spread on Variable Rate			4.25%
Minimum | Line of Credit | Term Loan
Debt Instrument [Line Items]
Debt Instrument, Payment, Percentage	0.00%
Maximum | Line of Credit | Term Loan
Debt Instrument [Line Items]
Debt Instrument, Payment, Percentage	0.00%

LongTerm_Debt_Debt_Schedule_De

Long-Term Debt (Debt Schedule) (Details) (Line of Credit, Term Loan, USD $)	Apr. 04, 2015	Mar. 10, 2015	Mar. 29, 2014
Line of Credit | Term Loan
Debt Instrument [Line Items]
Principal amount	$350,000,000	$350,000,000	$0
Unamortized original issue discount and debt issuance costs	-11,500,000	-3,500,000	0
Less current portion of Long-term debt	-122,000		0
Long-term debt	$338,378,000		$0

LongTerm_Debt_Interest_Expense

Long-Term Debt (Interest Expense) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
Debt Disclosure [Abstract]
Contractual interest	$1,327	$0
Amortization of debt issuance costs and discount	284	0
Total Interest expense related to the Term Loan	$1,611	$0

StockBased_Compensation_Stockb

Stock-Based Compensation (Stock-based Compensation Expense) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$7,275	$3,090
Cost of products sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	240	166
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	1,509	1,034
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	1,635	1,890
Acquisition-related Costs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$3,891	$0

StockBased_Compensation_Narrat

Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$7,275,000	$3,090,000
Compensation Cost	1,700,000
Accrued Payroll	2,200,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in Period	306,000
Award Requisite Service Period	2 years
Options, Nonvested, Number of Shares	306,000
Total stock-based compensation	$100,000
Minimum | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage	0.00%
Maximum | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage	200.00%

Segment_and_Geographic_Informa2

Segment and Geographic Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 04, 2015	Mar. 29, 2014
	segment
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments	2
Total revenue	$88,597	$96,637
Total revenue as percentage	100.00%	100.00%
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	62,534	72,744
Total revenue as percentage	70.00%	75.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	16,467	14,710
Total revenue as percentage	19.00%	15.00%
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$9,596	$9,183
Total revenue as percentage	11.00%	10.00%