Semtech (SMTC) 10-Q 28 Nov 18 2019 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Oct. 28, 2018	Nov. 23, 2018
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Oct. 28, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q3
Entity Registrant Name	SEMTECH CORP
Entity Central Index Key	88,941
Current Fiscal Year End Date	--01-27
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		65,808,898

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Net sales	$ 173,550	$ 150,304	$ 467,190	$ 447,233
Cost of sales	66,988	60,885	189,035	180,663
Gross profit	106,562	89,419	278,155	266,570
Operating costs and expenses:
Selling, general and administrative	39,587	36,568	114,522	109,820
Product development and engineering	27,147	27,631	81,425	81,046
Intangible amortization	6,480	7,453	19,921	20,414
Loss on disposition of business operations	0	0	0	375
Changes in the fair value of contingent earn-out obligations	(8,519)	188	(9,419)	188
Total operating costs and expenses	64,695	71,840	206,449	211,843
Operating income	41,867	17,579	71,706	54,727
Interest expense, net	(2,355)	(2,032)	(6,745)	(6,107)
Non-operating income, net	1,182	5,517	1,914	4,681
Investment impairments	(30,000)	(4,250)	(30,000)	(4,250)
Income before taxes and equity in net losses of equity method investments	10,694	16,814	36,875	49,051
Provision for taxes	(1,454)	3,272	(12,882)	11,124
Net income before equity in net losses of equity method investments	12,148	13,542	49,757	37,927
Equity in net gain (losses) of equity method investments	17	(204)	(41)	(204)
Net income	$ 12,165	$ 13,338	$ 49,716	$ 37,723
Earnings per share:
Basic (in dollars per share)	$ 0.18	$ 0.20	$ 0.75	$ 0.57
Diluted (in dollars per share)	$ 0.18	$ 0.20	$ 0.73	$ 0.56
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,014	66,194	66,134	65,932
Diluted (in shares)	68,731	67,817	68,549	67,555

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Net income	$ 12,165	$ 13,338	$ 49,716	$ 37,723
Other comprehensive income, net:
Unrealized gain on convertible debt	0	0	0	750
Release of realized gain on convertible debt	0	0	0	(750)
Change in employee benefit plans	(16)	22	(48)	65
Other comprehensive income (loss), net	3	(631)	(121)	158
Comprehensive income	12,168	12,707	49,595	37,881
Foreign Exchange Contract [Member]
Other comprehensive income, net:
Unrealized gain (loss) on foreign currency cash flow hedges	8	(144)	(109)	865
Realized gain (loss) on foreign currency cash flow hedges	$ 11	$ (509)	$ 36	$ (772)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Current assets:
Cash and cash equivalents	$ 312,236	$ 307,923
Accounts receivable, less allowances of $841 and $9,089, respectively	83,820	53,183
Inventories	61,159	71,067
Prepaid taxes	11,093	11,809
Other current assets	18,126	17,250
Total current assets	486,434	461,232
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $193,453 and $179,604, respectively	119,481	124,586
Deferred tax assets	27,485	4,236
Goodwill	355,175	341,897
Other intangible assets, net	40,286	60,207
Other assets	55,523	93,618
TOTAL ASSETS	1,084,384	1,085,776
Current liabilities:
Accounts payable	40,556	37,208
Accrued liabilities	60,856	60,832
Deferred revenue	965	12,758
Current portion - long-term debt	18,256	15,410
Total current liabilities	120,633	126,208
Non-current liabilities:
Deferred tax liabilities	13,814	14,682
Long term debt, less current portion	197,417	211,114
Other long-term liabilities	59,583	68,759
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.01 par value, 250,000,000 shares authorized, 78,136,144 issued and 65,779,522 outstanding and 78,136,144 issued and 66,280,129 outstanding, respectively	785	785
Treasury stock, at cost, 12,356,622 shares and 11,856,015 shares, respectively	(313,019)	(251,974)
Additional paid-in capital	444,903	415,056
Retained earnings	561,589	502,346
Accumulated other comprehensive loss	(1,321)	(1,200)
Total stockholders’ equity	692,937	665,013
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,084,384	$ 1,085,776

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, receivables	$ 841	$ 9,089
Accumulated depreciation	$ 193,453	$ 179,604
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	78,136,144	78,136,144
Common stock, shares outstanding	65,779,522	66,280,129
Treasury stock, shares	12,356,622	11,856,015

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017
Cash flows from operating activities:
Net income	$ 49,716	$ 37,723
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,332	35,794
Impairment of investments	30,000	4,250
Accretion of deferred financing costs and debt discount	399	430
Deferred income taxes	(19,001)	5,508
Share-based compensation and warrant costs	60,947	44,166
Loss on disposition of business operations and assets	(68)	283
Earn-out liabilities	(9,419)	188
Equity in net losses of equity method investments	41	204
Gain from convertible debt settlement	0	(4,275)
Corporate owned life insurance, net	41	843
Changes in assets and liabilities:
Accounts receivable, net	(26,096)	(14,726)
Inventories	10,754	(5,697)
Other assets	1,377	(2,618)
Accounts payable	5,329	(6,683)
Accrued liabilities	(2,538)	(7,808)
Deferred revenue	(488)	(55)
Income taxes payable	(1,697)	(17,520)
Other liabilities	(264)	2,843
Net cash provided by operating activities	136,365	72,850
Cash flows from investing activities:
Proceeds from convertible debt settlement	0	5,700
Proceeds from sales of property, plant and equipment	112	180
Purchase of property, plant and equipment	(12,928)	(26,818)
Purchase of investments	(6,701)	(13,337)
Acquisition, net of cash acquired	(7,265)	(17,619)
Proceeds from sale of investments	1,601	0
Net cash used in investing activities	(25,181)	(51,894)
Cash flows from financing activities:
Payments of term loans	(11,250)	(11,250)
Payment of earn-out	(8,530)	0
Payment for employee share-based compensation payroll taxes	(17,802)	(10,661)
Proceeds from exercise of stock options	10,449	5,340
Repurchase of outstanding common stock	(79,738)	(10,394)
Net cash used in financing activities	(106,871)	(26,965)
Net increase (decrease) in cash and cash equivalents	4,313	(6,009)
Cash and cash equivalents at beginning of period	307,923	297,134
Cash and cash equivalents at end of period	312,236	291,125
Supplemental disclosure of cash flow information
Income taxes paid	4,042	24,632
Interest paid	5,705	5,197
Non-cash items
Capital expenditures in accounts payable	$ 2,178	$ 4,417

Organization and Basis of Prese

Organization and Basis of Presentation	9 Months Ended
	Oct. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Nature of Business Semtech Corporation (together with its consolidated subsidiaries, the "Company" or "Semtech") is a global supplier of analog and mixed-signal semiconductors and advanced algorithms. The end customers for the Company’s products are primarily original equipment manufacturers ("OEMs") that produce and sell electronics. The Company designs, develops and markets a wide range of products for commercial applications, the majority of which are sold into the enterprise computing, communications, high-end consumer and industrial end-markets. Enterprise Computing: datacenters, passive optical networks, desktops, notebooks, servers, monitors, printers and other computer peripherals. Communications: base stations, optical networks, carrier networks, switches and routers, cable modems, wireless LAN and other communication infrastructure equipment. High-End Consumer: handheld products, smartphones, wireless charging, set-top boxes, digital televisions, monitors and displays, tablets, wearables, digital video recorders and other consumer equipment. Industrial: analog and digital video broadcast equipment, video-over-IP solutions, automated meter reading, Internet of Things ("IoT"), smart grid, wireless charging, military and aerospace, medical, security systems, automotive, industrial and home automation and other industrial equipment. Fiscal Year The Company reports results on the basis of 52 and 53 week periods and ends its fiscal year on the last Sunday in January. The other quarters generally end on the last Sunday of April, July and October. All quarters consist of 13 weeks except for one 14 -week period in the fourth quarter of 53 -week years. The third quarter of fiscal years 2019 and 2018 each consisted of 13 weeks. Principles of Consolidation The accompanying interim unaudited condensed consolidated financial statements have been prepared by the Company, in accordance with accounting principles generally accepted in the United States ("GAAP") and on the same basis as the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 28, 2018 ("Annual Report"). In the opinion of the Company, these interim unaudited condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to present fairly, in all material respects, the financial position of the Company for the interim periods presented. All intercompany balances have been eliminated. Certain information and footnote disclosures normally included in annual consolidated financial statements have been condensed or omitted pursuant to the rules and regulations of the U.S. Securities and Exchange Commission. Because the interim unaudited condensed consolidated financial statements do not include all of the information and notes required by GAAP for a complete set of consolidated financial statements, they should be read in conjunction with the audited consolidated financial statements and notes included in the Company's Annual Report. The results reported in these interim unaudited condensed consolidated financial statements should not be regarded as indicative of results that may be expected for any subsequent period or for the entire year. The Company’s interim unaudited condensed consolidated statements of income are referred to herein as the "Statements of Income." The Company’s interim unaudited condensed consolidated balance sheets are referred to herein as the "Balance Sheets" and interim unaudited condensed consolidated statements of cash flows as the "Statements of Cash Flows." Segment Information The Company’s Chief Executive Officer ("CEO") has been identified as the Chief Operating Decision Maker ("CODM") as defined by guidance regarding segment disclosures (see Note 12 for further discussion). Prior to the first quarter of fiscal year 2019, the Company had four operating segments that aggregated into one reportable segment. Beginning with the first quarter of fiscal year 2019, the Company identified three operating segments that aggregate into one reportable segment, the Semiconductor Products Group. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Acquisitions On August 17, 2018, the Company, through its subsidiary Semtech (International) AG, a Swiss corporation, entered into a share purchase agreement to purchase all of the outstanding equity interests of Trackio International AG, a Swiss corporation, and its subsidiaries (collectively, "TrackNet"), for an aggregate purchase price of approximately $8.5 million (the "TrackNet Acquisition"). The purchase price is expected to be funded by cash on hand. The closing of the TrackNet Acquisition is subject to customary conditions and certain regulatory approvals. In connection with the signing of the TrackNet Acquisition, the employees of TrackNet have become employees or independent contractors of the Company. In addition, TrackNet entered into an agreement under which key TrackNet intellectual property has been licensed to the Company. As a result, control of TrackNet's business transferred to the Company during the third quarter of fiscal year 2019. The amount payable to TrackNet has been treated as contingent consideration since the payment of this amount is dependent upon regulatory approval, which the Company expects to receive during the fourth quarter of fiscal year 2019. The transaction was accounted for as a business combination and the entire purchase price of $8.5 million has been preliminarily attributed to goodwill (see Note 8 ). The Company is still in the process of determining the final purchase price allocation. On May 2, 2018, the Company acquired substantially all the assets of IC Interconnect, Inc. (“ICI”) for a cash payment of approximately $7.3 million . The addition of ICI is aimed at further enhancing the Company’s U.S. research and development capabilities for its next-generation Z-Pak platform. $4.8 million was attributed to goodwill (see Note 8 ) and $2.5 million was attributed to the estimated fair values of the tangible net assets acquired. The goodwill is deductible for tax purposes. The transaction was accounted for as a business combination and we are still assessing the purchase price allocation. Net revenues, earnings and pro forma results of operations have not been presented because they are not material to the Company’s consolidated financial statements. Settlements On August 1, 2018, the Company announced the settlement of a lawsuit filed against HiLight Semiconductor Limited and related individual defendants in accordance with which the Company is to be paid approximately $9.0 million to cover damages for claims, costs and attorneys' fees. Approximately $6.6 million was received during the second quarter of fiscal year 2019, and is presented within "Selling, general and administrative" ("SG&A") in the Statements of Income. Recent Accounting Standards Adopted In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Accounting Standards Codification ("ASC") 606), which requires an entity to recognize revenue from the transfer of control of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance addresses, in particular, contracts with more than one performance obligation, as well as the accounting for some costs to obtain or fulfill a contract with a customer, and provides for additional disclosures with respect to revenues and cash flows arising from contracts with customers. The Company adopted the standard, effective January 29, 2018, using the modified retrospective transition method which resulted in an adjustment to retained earnings for the cumulative effect of applying the standard to all contracts not completed as of the adoption date. The primary change associated with the adoption relates to the Company’s sales to distributors with return or price adjustment rights where the Company will no longer defer revenue until the resale by the distributor to the end customer, but rather, will record revenue at the time control transfers to the distributor. The Company estimated the effects of returns and allowances provided to these distributors. Upon adoption, including the effect of income taxes, opening retained earnings as of January 29, 2018 increased by $11.1 million net, as a result of these changes. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Asset Transfers Other Than Inventory (Topic 740). This accounting standard update is aimed at recognizing the income tax consequences of intra-entity transfers of assets other than inventory when they occur. This removes the exception to postpone the recognition of income tax consequences of intra-entity transfers until the asset has been sold to an outside party. In the first quarter of 2019, the Company adopted ASU 2016-16 using a modified retrospective transition method, resulting in a $1.8 million decrease in retained earnings, a $3.7 million net increase in deferred income tax assets, and a $5.5 million decrease in pre-paid taxes. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (Topic 230). The primary purpose of this ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. In the first quarter of fiscal year 2019, the Company adopted ASU 2016-15. Accounting Guidance Issued but Not Adopted as of October 28, 2018 In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which will require that substantially all leases be recognized by lessees on their balance sheets as a right-of-use asset and corresponding lease liability, including leases currently accounted for as operating leases with the exception of short-term leases. Public entities are required to apply the amendments for annual periods beginning after December 15, 2018 and for interim periods within those annual periods. The Company will adopt this update beginning in the first quarter of fiscal year 2020 utilizing the modified retrospective transition method by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company expects to elect certain practical expedients permitted under the transition guidance within the standard. The Company is currently in the process of determining the impact that the updated accounting guidance will have on its consolidated financial statements.

Revenue

Revenue	9 Months Ended
	Oct. 28, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The Company derives its revenue primarily from the sale of semiconductor products into various end markets. Revenue is recognized when control of these products is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for these products. Control is generally transferred when products are shipped and, to a lesser extent, when the products are delivered. Recovery of costs associated with product design and engineering services are recognized during the period in which services are performed and are reported as a reduction to product development and engineering expense. Historically, these recoveries have not exceeded the cost of the related development efforts. The Company includes revenue related to granted technology licenses as part of "Net sales" in the Statements of Income. Historically, revenue from these arrangements has not been significant though it is part of its recurring ordinary business. The Company determines revenue recognition through the following five steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, performance obligations are satisfied. The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The Company’s revenue contracts generally represent a single performance obligation to sell its products to trade customers. Net sales reflect the transaction prices for contracts, which include units shipped at selling prices reduced by variable consideration. Determination of variable consideration requires judgment by the Company. Variable consideration includes expected sales returns and other price adjustments. Variable consideration is estimated using the expected value method considering all reasonably available information, including the Company’s historical experience and its current expectations, and is reflected in the transaction price when sales are recorded. Sales returns are generally accepted at the Company’s discretion or from distributors with such rights. The Company’s contracts with trade customers do not have significant financing components or non-cash consideration. The Company records net sales excluding taxes collected on its sales to its trade customers. The Company provides an assurance type warranty which is typically not sold separately and does not represent a separate performance obligation. The Company’s payment terms are generally aligned with shipping terms. The following presents the amounts by which financial statement line items were affected in the current periods due to the adoption of ASC 606 as compared with the guidance that was in effect before the change: Three Months Ended Nine Months Ended Statements of Income October 28, 2018 October 28, 2018 (in thousands, except per share amounts) Increase/(decrease) Increase/(decrease) Net sales $ 3,251 $ 9,597 Cost of sales $ 746 $ 2,190 Provision for taxes $ 526 $ 1,555 Net income $ 1,979 $ 5,851 Earnings per share: Basic $ 0.03 $ 0.09 Diluted $ 0.03 $ 0.09 Balance Sheets October 28, 2018 (in thousands) Increase/(decrease) Deferred revenue $ (19,889 ) Excludes line items that were not materially affected by the Company's adoption of ASC 606. The adoption had no impact to total net cash provided by or used in operating, investing or financing activities in the Statements of Cash Flows. Contract Modifications: If a contract is modified, which does not normally occur, changes in contract specifications and requirements must be accounted for. The Company considers contract modifications to exist when the modification either creates new or changes the existing enforceable rights and obligations. Most of the Company’s contract modifications are to distributor agreements for adding new goods or services that are considered distinct from the existing contract and the change in contract price reflects the standalone selling price of the distinct service. Disaggregated Revenue: The Company disaggregates revenue from contracts with customers by types of products and geography, as it believes it best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Refer to “Note 12 : Segment Information” for further information on revenues by product line and geographic region. Contract Balances: Accounts receivable represents the Company’s unconditional right to receive consideration from its customers. Contract assets consist of the Company’s right to consideration in exchange for goods or services that the Company has transferred to a customer when that right is conditioned on something other than the passage of time. ASC 606 also requires an entity to present a revenue contract as a contract liability in instances when a customer pays consideration, or an entity has a right to an amount of consideration that is unconditional (e.g. receivable), before the entity transfers a good or service to the customer. The opening and closing contract asset and contract liability balances are not material. There were no impairment losses recognized on the Company’s accounts receivable or contract assets during the three and nine months ended October 28, 2018 . There were no significant changes in the contract assets or the contract liabilities for the three and nine months ended October 28, 2018 . Practical Expedients: Unsatisfied Performance Obligations: Because all of the Company’s performance obligations relate to contracts with a duration of less than one year, the Company elected to apply the optional exemption provided in ASC 606 and, therefore, is not required to disclose the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. Contract Costs: All incremental customer contract acquisition costs are expensed as they are incurred as the amortization period of the asset that the Company otherwise would have recognized is one year or less in duration. Significant Financing Component: The Company does not adjust the promised amount of consideration for the effects of a significant financing component as the Company expects, at contract inception, that the period between when the Company transfers a promised good or service to a customer and when the customer pays for that good or service will be one year or less. Sales Tax Exclusion from the Transaction Price: The Company excludes from the measurement of the transaction price all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by the Company from the customer. Shipping and Handling Activities: The Company accounts for shipping and handling activities performed after a customer obtains control of the good as activities to fulfill the promise to transfer the good.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Oct. 28, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per Share The computation of basic and diluted earnings per common share was as follows: Three Months Ended Nine Months Ended (in thousands, except per share amounts) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Net income $ 12,165 $ 13,338 $ 49,716 $ 37,723 Weighted average common shares outstanding - basic 66,014 66,194 66,134 65,932 Dilutive effect of stock options and restricted stock units 2,717 1,623 2,415 1,623 Weighted average common shares outstanding - diluted 68,731 67,817 68,549 67,555 Basic earnings per common share $ 0.18 $ 0.20 $ 0.75 $ 0.57 Diluted earnings per common share $ 0.18 $ 0.20 $ 0.73 $ 0.56 Anti-dilutive shares not included in the above calculations 289 362 496 447 Basic earnings per common share is computed by dividing income available to common stockholders by the weighted-average number of shares of common stock outstanding during the reporting period. Diluted earnings per common share incorporates the incremental shares issuable, calculated using the treasury stock method, upon the assumed exercise of non-qualified stock options, the vesting of restricted stock units and performance unit awards if the conditions have been met.

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Oct. 28, 2018
Share-based Compensation [Abstract]
Share-Based Compensation	Share-Based Compensation Financial Statement Effects and Presentation . The following table summarizes pre-tax share-based compensation included in the Statements of Income for the three and nine months ended October 28, 2018 and October 29, 2017 . Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Revenue offset $ — $ 6,249 $ 21,501 $ 14,726 Cost of sales 477 316 1,110 1,161 Selling, general and administrative 8,478 6,589 31,318 22,200 Product development and engineering 2,511 2,202 7,018 6,079 Share-based compensation $ 11,466 $ 15,356 $ 60,947 $ 44,166 Net change in share-based compensation capitalized into inventory $ — $ — $ — $ (414 ) Warrant . On October 5, 2016, the Company issued a warrant (the "Warrant") to Comcast Cable Communications Management LLC ("Comcast") to purchase up to 1,086,957 shares (the "Warrant Shares") of the common stock of Semtech Corporation. The Warrant was issued by the Company to Comcast in connection with an agreement between the parties regarding the intended trial deployment by Comcast of a low-power wide-area network in the United States ("U.S."), based on the Company’s LoRa® devices and wireless radio frequency technology. The Warrant was accounted for as equity and the cost was recognized as an offset to net sales over the respective performance period. The Warrant consisted of five performance tranches. The cost associated with each tranche had been recognized based on the fair value at each reporting date until vesting which was the measurement date. On April 27, 2018, the Company accelerated the vesting of the remaining 586,956 unvested shares from the Warrant, resulting in the full recognition of the remaining costs to be recognized for the Warrant. For the nine month period ended October 28, 2018 , the revenue offset reflects the cost associated with the Warrant of $21.5 million , including $15.9 million related to the acceleration. The Warrant is now fully-vested and exercisable for a total of 869,565 shares, with no additional costs to be recognized in future periods. Performance-Based Restricted Stock Units . The Company grants performance-based restricted stock units to select employees. The performance-based restricted stock units are valued as of the measurement date and expense is recognized on a straight line basis for the awards expected to vest based on the probability of attainment of the performance condition for each separately vesting portion of the award. In the first quarter of fiscal year 2019 , the Company granted 200,442 performance-based restricted stock units that have a pre-defined market condition and a service condition that are accounted for as equity awards. The market condition is determined based upon the Company’s total stockholder return ("TSR") benchmarked against the TSR of the S&P SPDR Semiconductor ETF (NYSE:XSD) over a one , two and three year period ( one-third of the awards vesting each performance period ). The fiscal year 2019 award recipients must be employed for the entire performance period and be an active employee at the time of vesting of the awards. The Company used a Monte Carlo simulation to determine the grant-date fair value for these awards, which takes into consideration the possible outcomes pertaining to the TSR market condition. The grant-date fair value per unit of the awards granted in the first quarter of fiscal year 2019 for each one, two and three year performance period is $33.02 , $34.85 and $36.52 , respectively. Award Modifications . In the first quarter of fiscal year 2019, the Company modified the terms of 159,000 fully vested shares held by 8 employees. As a result of the modification, additional compensation cost of $2.8 million was recognized during the first quarter of fiscal year 2019.

Investments

Investments	9 Months Ended
	Oct. 28, 2018
Investments [Abstract]
Investments	Investments The following table summarizes the Company’s available-for-sale securities: October 28, 2018 January 28, 2018 (in thousands) Market Value Adjusted Cost Gross Unrealized Gain Market Value Adjusted Cost Gross Unrealized Gain Convertible debt $ 3,105 $ 3,105 $ — $ 1,960 $ 1,960 $ — Total other assets $ 3,105 $ 3,105 $ — $ 1,960 $ 1,960 $ — The following table summarizes the maturities of the Company’s available-for-sale securities: October 28, 2018 January 28, 2018 (in thousands) Market Value Adjusted Cost Market Value Adjusted Cost Within 1 year $ 2,000 $ 2,000 $ 1,960 $ 1,960 After 1 year through 5 years 1,105 1,105 — — Total investments $ 3,105 $ 3,105 $ 1,960 $ 1,960 The Company's available-for-sales securities consisted of investments in convertible debt instruments issued by privately-held companies and is included in "Other current assets" in the Balance Sheets. The Company currently has an investment in Multiphy Ltd. ("Multiphy") that is accounted for at cost and included in "Other assets" in the Balance Sheets. During the third quarter of fiscal year 2019, the Company reduced its expectation of Multiphy's future operating performance due to new information that became available during the quarter. The Company concluded that the competitive landscape had evolved and that product release and broad market adoption of 400G PAM4 digital signal processing (DSP) technology is delayed. As a result of these indicators of impairment, the Company tested the investment for an other-than-temporary impairment using a discounted cash flow model. The results of its analysis indicated that the investment was other-than temporarily impaired by $30.0 million , representing the entire carrying value of the investment.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Oct. 28, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Instruments Measured at Fair Value on a Recurring Basis Financial assets and liabilities measured and recorded at fair value on a recurring basis were presented in the Company's Balance Sheets as follows: Fair Value as of October 28, 2018 Fair Value as of January 28, 2018 (in thousands) Total (Level 1) (Level 2) (Level 3) Total (Level 1) (Level 2) (Level 3) Financial assets: Convertible debt $ 3,105 $ — $ — $ 3,105 $ 1,960 $ — $ — $ 1,960 Total financial assets $ 3,105 $ — $ — $ 3,105 $ 1,960 $ — $ — $ 1,960 Financial liabilities: AptoVision Earn-out $ 2,161 $ — $ — $ 2,161 $ 21,000 $ — $ — $ 21,000 Cycleo Earn-out 462 — — 462 668 — — 668 Derivative financial instruments 120 — 120 — — — — — Total financial liabilities $ 2,743 $ — $ 120 $ 2,623 $ 21,668 $ — $ — $ 21,668 During the nine months ended October 28, 2018 , the Company had no transfers of financial assets or liabilities between Level 1, Level 2 or Level 3. As of October 28, 2018 and January 28, 2018 , the Company had not elected the fair value option for any financial assets and liabilities for which such an election would have been permitted. The fair values of the foreign exchange forward contracts are valued using Level 2 inputs. Foreign currency forward contracts are valued using readily available foreign currency forward and interest rate curves. The fair value of each contract is determined by comparing the contract rate to the forward rate and discounting to the present value. Contracts in a gain position are recorded in the Balance Sheets within the caption "Other current assets" and the value of contracts in a loss position are recorded within the caption "Accrued liabilities" in the Balance Sheets. Please see Note 15 for further discussion of the Company’s derivative instruments. The convertible debt is valued using probability weighted cash flows (Level 3 inputs). The AptoVision Earn-out liability (see Note 11 ) is valued utilizing estimates of annual revenue, adjusted earnings and product development targets (Level 3 inputs) through July 2020. These estimates represent inputs for which market data are not available and are developed using the best information available about the assumptions that market participants would use when pricing the liability. The Cycleo Earn-out liability (see Note 11 ) is valued utilizing estimates of annual revenue and operating income (Level 3 inputs) through April 2020. These estimates represent inputs for which market data are not available and are developed using the best information available about the assumptions that market participants would use when pricing the liability. The Company measures contingent earn-out liabilities at fair value on a recurring basis using significant unobservable inputs classified within Level 3 of the fair value hierarchy. The Company uses a Monte Carlo valuation method as a valuation technique to determine the value of the earn-out liability. The significant unobservable inputs used in the fair value measurements are revenue projections over the earn-out period, and the probability outcome percentages assigned to each scenario. Significant increases or decreases to either of these inputs in isolation would result in a significantly higher or lower liability, with a higher liability capped by the contractual maximum of the contingent earn-out obligation. Ultimately, the liabilities will be equivalent to the amount paid, and the difference between the fair value estimate and amount paid will be recorded in earnings. For the Cycleo Earn-out and AptoVision Earn-out, these companies have business profiles comparable to a start-up company. Accordingly, their respective revenue projections are subject to significant revisions. This characteristic can result in volatile changes to the measurement of fair value for a given earn-out. The Company reviews and re-assesses the estimated fair value of contingent consideration on a recurring basis, and the updated fair value could differ materially from the previous estimates. Adjustments to the estimated fair value related to changes in all other unobservable inputs are reported in operating income. A reconciliation of the change in the earn-out liability during the nine months ended October 28, 2018 is as follows: (in thousands) AptoVision Cycleo Total Balance at January 28, 2018 $ 21,000 $ 668 $ 21,668 Changes in the fair value of contingent earn-out obligations (9,419 ) — (9,419 ) Payments (9,420 ) (206 ) (9,626 ) Balance as of October 28, 2018 $ 2,161 $ 462 $ 2,623 Instruments Not Recorded at Fair Value on a Recurring Basis Some of the Company’s financial instruments are not measured at fair value on a recurring basis but are recorded at amounts that approximate fair value due to their liquid or short-term nature. Such financial assets and financial liabilities include: cash and cash equivalents including money market deposits, net receivables, certain other assets, accounts payable, accrued expenses, accrued personnel costs, and other current liabilities. The Company’s long-term debt is not recorded at fair value on a recurring basis, but is measured at fair value for disclosure purposes. The fair value of the Company’s Term Loans (as defined in Note 9 ) is $120.0 million and $131.3 million as of October 28, 2018 and January 28, 2018 , respectively. The fair value of the Company's Revolving Loans (as defined in Note 9 ) is $97.0 million as of both October 28, 2018 and January 28, 2018 , respectively. These are based on Level 2 inputs which are derived from transactions with similar amounts, maturities, credit ratings and payment terms. Assets and Liabilities Recorded at Fair Value on a Non-Recurring Basis The Company reduces the carrying amounts of its goodwill, intangible assets, long-lived assets and non-marketable equity securities to fair value when held for sale or determined to be impaired. For its investment in non-marketable equity interests, the Company has not identified, other than as stated below, events or changes in circumstances that may have a significant adverse effect on the fair value of its equity investments during the first nine months of fiscal year 2019 . As noted in Note 5 , the Company tested a cost method investment for impairment during the third quarter of fiscal year 2019 that resulted in a $30.0 million write-down of the investment. In determining that the fair value of the Company’s investment is zero, the Company used a discounted cash flow model. The valuation model is most sensitive to the weighted average cost of capital assumption, which was determined to be approximately 38.8% , given the nature of the investment.

Inventories

Inventories	9 Months Ended
	Oct. 28, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories, consisting of material, material overhead, labor, and manufacturing overhead, are stated at the lower of cost (first-in, first-out) or market and consist of the following: (in thousands) October 28, 2018 January 28, 2018 Raw materials $ 2,145 $ 1,651 Work in progress 41,820 46,884 Finished goods 17,194 22,532 Inventories $ 61,159 $ 71,067

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Oct. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill – Changes in the carrying amount of goodwill by applicable reporting unit were as follows: (in thousands) Signal Integrity Wireless and Sensing Protection Total Balance at January 28, 2018 $ 274,085 $ 67,812 $ — $ 341,897 Additions — 8,500 4,778 13,278 Balance at October 28, 2018 $ 274,085 $ 76,312 $ 4,778 $ 355,175 As a result of the realignment of its operating segments, during the first quarter of fiscal year 2019, the Company combined the Wireless and Sensing and the Power and High-Reliability reporting units (see Note 12 ). Goodwill of $49.4 million related to the Power and High-Reliability reporting unit which was previously a separate reporting unit is now included in the Wireless and Sensing reporting unit’s goodwill balance. The reporting units are the same as the operating segments which are part of a single reportable segment. The difference between the fair value and the carrying amount of these reporting units is one of several factors the Company will consider before reaching its conclusion about whether to perform the first step of the goodwill impairment test. During fiscal year 2019, goodwill was recorded for the acquisition of ICI, which is part of the Protection reporting unit, and the acquisition of TrackNet, which is part of the Wireless and Sensing reporting unit. Purchased Intangibles – The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which continue to be amortized: October 28, 2018 January 28, 2018 (in thousands) Estimated Useful Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Core technologies 5-8 years $ 164,930 $ (131,250 ) $ 33,680 $ 164,930 $ (115,628 ) $ 49,302 Customer relationships 3-10 years 34,031 (29,725 ) 4,306 34,031 (25,426 ) 8,605 Total finite-lived intangible assets $ 198,961 $ (160,975 ) $ 37,986 $ 198,961 $ (141,054 ) $ 57,907 Amortization expenses recorded in the Statements of Income for each period were as follows: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Core technologies $ 5,047 $ 6,020 $ 15,622 $ 16,669 Customer relationships 1,433 1,433 4,299 3,745 Total amortization expense $ 6,480 $ 7,453 $ 19,921 $ 20,414 The following table sets forth the Company’s indefinite-lived intangible assets resulting from additions to in-process research and development: (in thousands) Net Carrying Value Value at January 28, 2018 $ 2,300 In-process research and development through acquisitions — Value at October 28, 2018 $ 2,300 The Company reviews indefinite-lived intangible assets for impairment during the fourth quarter of each year by comparing the carrying amount of the asset to the future discounted cash flows that asset is expected to generate.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Oct. 28, 2018
Debt Instruments [Abstract]
Long-Term Debt	Long-term debt and the current period interest rates were as follows: Balance as of (in thousands) October 28, 2018 January 28, 2018 Term loans $ 120,000 $ 131,250 Revolving loans 97,000 97,000 Total debt 217,000 228,250 Current portion (18,256 ) (15,410 ) Total long-term debt 198,744 212,840 Debt issuance costs (1,327 ) (1,726 ) Total long-term debt, net of debt issuance costs $ 197,417 $ 211,114 Weighted-average interest rate 3.87 % 3.19 % On November 15, 2016, the Company, with certain of its domestic subsidiaries as guarantors, entered into an amended and restated credit agreement with the lenders party thereto and HSBC Bank USA, National Association, as administrative agent, swing line lender and letter of credit issuer, consisting of senior secured term loans in an aggregate principal amount of $150.0 million (the "Term Loans") and senior secured revolving commitments in an aggregate principal amount of $250.0 million (the “Revolving Loans” and together with the Term Loans, the "Credit Facility"). The Credit Facility is scheduled to mature on November 12, 2021. The outstanding principal balance of the Term Loans is subject to repayment in quarterly installments. No amortization is required with respect to the Revolving Loans. As of October 28, 2018 , we were in compliance with all financial covenants required under the Credit Facility. Scheduled maturities of current and long-term Term Loans are as follows: (in thousands) Fiscal Year Ending: 2019 $ 4,688 2020 18,750 2021 19,687 2022 76,875 Total Term Loans $ 120,000 As of October 28, 2018 , we had $153.0 million of unused borrowing capacity under the Revolving Loans. As of October 28, 2018 , there were no amounts outstanding under the letters of credit, swing line loans and alternative currency sub-facilities.

Income Taxes

Income Taxes	9 Months Ended
	Oct. 28, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate differs from the statutory federal income tax rate of 21% primarily due to regional mix of income, a partial release of the valuation allowance in the U.S., and true-up related to mandatory deemed repatriation of foreign earnings ("Transition Tax"). The valuation allowance was released in the first quarter of fiscal year 2019 as a result of the Company obtaining the information necessary to evaluate the impact of the Global Intangible Low-Taxed Income (“GILTI”) provisions, enacted as part of the Tax Cuts and Jobs Act (“Tax Act”) on December 22, 2017. This item was left open under Staff Accounting Bulletin 118 (“SAB 118”) in the financial statements for the fiscal year ended January 28, 2018 and the Company has now made a reasonable estimate based on the most current information available. The Tax Act made significant changes to U.S. income tax laws, including transitioning from a worldwide tax system to a territorial tax system. This change in the U.S. international tax system included the introduction of several new tax regimes that are effective as of January 1, 2018, including the GILTI provisions. The GILTI provisions effectively tax the foreign earnings of U.S. multinational companies at 10.5% , half the current corporate tax rate. During the three months ended April 29, 2018, the Company finalized its analysis regarding the interplay of the foreign tax credits associated with this income, which are allowed against the U.S. tax liability generated as a result of the GILTI provision, and the potential impact on the related valuation allowance. As a result, the Company recorded a tax benefit of $15.8 million during the first quarter of fiscal year 2019 related to the reduction of the valuation allowance on certain U.S. deferred tax assets generated prior to fiscal year 2019. In the third quarter of fiscal year 2019, the Company recorded a $4.7 million reduction to the provisional tax expense for the Transition Tax. The adjustment to the provisional tax expense during the quarter resulted from completing the calculations of the Transition Tax and finalizing the Company’s U.S. federal income tax return. The Company expects final accounting related to the remeasurement of its existing deferred tax assets under SAB 118 to be complete during the fourth quarter of fiscal year 2019. While management believes the provisional amounts recorded during the nine months ended October 28, 2018 and the fiscal year ended January 28, 2018 represent reasonable estimates of the ultimate impact U.S. tax reform will have on the Company's consolidated financial statements, it is possible the Company may continue to materially adjust these amounts for related administrative guidance, notices, implementation regulations, potential legislative amendments and interpretations as the Tax Act continues to evolve. These adjustments could have an impact on the Company's Balance Sheets and Statements of Income. The Company uses a two-step approach to recognize and measure uncertain tax positions ("UTP"). The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits (before the federal impact of state items) is as follows: (in thousands) Balance at January 28, 2018 $ 16,059 Additions based on tax positions related to the current year 2,145 Balance as of October 28, 2018 $ 18,204 Included in the balance of gross unrecognized tax benefits at October 28, 2018 and January 28, 2018 , are $5.7 million and $3.9 million , respectively, of net tax benefits (after federal impact of state items), that, if recognized, would impact the effective tax rate, prior to consideration of any required valuation allowance. The liability for UTP is reflected in the Balance Sheets as follows: (in thousands) October 28, 2018 January 28, 2018 Deferred tax assets - non-current $ 12,468 $ 12,135 Other long-term liabilities 5,736 3,924 Total accrued taxes $ 18,204 $ 16,059 The Company’s policy is to include net interest and penalties related to unrecognized tax benefits within the "Provision for taxes" in the Statements of Income. Tax years prior to 2013 (the Company’s fiscal year 2014) are generally not subject to examination by the U.S. Internal Revenue Service ("IRS") except for items involving tax attributes that have been carried forward to tax years whose statute of limitations remains open. For state returns, the Company is generally not subject to income tax examinations for calendar years prior to 2012 (the Company’s fiscal year 2013). The Company has a significant tax presence in Switzerland for which Swiss tax filings have been examined through fiscal year 2017. The Company is also subject to routine examinations by various foreign tax jurisdictions in which it operates. The Company believes that adequate provisions have been made for any adjustments that may result from tax examinations. However, the outcome of tax audits cannot be predicted with certainty. If any issues addressed in the Company’s tax audits are resolved in a manner not consistent with the Company's expectations, the Company could be required to adjust its provision for income taxes in the period such resolution occurs. The Company’s regional income from continuing operations before taxes and equity in net losses of equity method investments is as follows: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Domestic $ (1,647 ) $ (2,366 ) $ (12,871 ) $ (11,396 ) Foreign 12,341 19,180 49,746 60,447 Total $ 10,694 $ 16,814 $ 36,875 $ 49,051

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 28, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Commitments and Contingencies In accordance with accounting standards regarding loss contingencies, the Company accrues an undiscounted liability for those contingencies where the incurrence of a loss is probable and the amount can be reasonably estimated. The Company also discloses the amount accrued and the amount of a reasonably possible loss in excess of the amount accrued, if such disclosure is necessary for its consolidated financial statements not to be misleading. The Company does not record liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated, or when the liability is believed to be only reasonably possible or remote. The Company evaluates, at least quarterly, developments in its legal matters that could affect the amount of liability that has been previously accrued, and makes adjustments as appropriate. Significant judgment is required to determine both probability and the estimated amount. The Company may be unable to estimate a possible loss or range of possible loss due to various reasons, including, among others: (i) if the damages sought are indeterminate; (ii) if the proceedings are in early stages, (iii) if there is uncertainty as to the outcome of pending appeals, motions or settlements, (iv) if there are significant factual issues to be determined or resolved, and (v) if there are novel or unsettled legal theories presented. In such instances, there is considerable uncertainty regarding the ultimate resolution of such matters, including a possible eventual loss, if any. Because the outcomes of litigation and other legal matters are inherently unpredictable, the Company’s evaluation of legal matters or proceedings often involves a series of complex assessments by management about future events and can rely heavily on estimates and assumptions. While the consequences of certain unresolved matters and proceedings are not presently determinable, and an estimate of the probable and reasonably possible loss or range of loss in excess of amounts accrued for such proceedings cannot be reasonably made, an adverse outcome from such proceedings could have a material adverse effect on the Company’s earnings in any given reporting period. However, in the opinion of management, after consulting with legal counsel, any ultimate liability related to current outstanding claims and lawsuits, individually or in the aggregate, is not expected to have a material adverse effect on the Company’s consolidated financial statements, as a whole. However, legal matters are inherently unpredictable and subject to significant uncertainties, some of which are beyond the Company’s control. As such, even though the Company intends to vigorously defend itself with respect to its legal matters, there can be no assurance that the final outcome of these matters will not materially and adversely affect the Company’s business, financial condition, operating results, or cash flows. From time to time, the Company is involved in various claims, litigation, and other legal actions that are normal to the nature of its business, including with respect to IP, contract, product liability, employment, and environmental matters. In the opinion of management, after consulting with legal counsel, any ultimate liability related to current outstanding claims and lawsuits, individually or in the aggregate, is not expected to have a material adverse effect on the Company’s consolidated financial statements, as a whole. The Company’s currently pending legal matters of note are discussed below: Environmental Matters The Company vacated a former facility in Newbury Park, California in 2002, but continues to address groundwater and soil contamination at the site. The Company’s efforts to address site conditions have been at the direction of the Los Angeles Regional Water Quality Control Board (“RWQCB”). In October 2013, an order was issued including a scope of proposed additional site work, monitoring, and proposed remediation activities. The Company filed appeals of the October 2013 order seeking reconsideration by the RWQCB and review by the State Water Resources Control Board ("SWRCB") of the removal of two other potentially responsible parties, and seeking clarification of certain other factual findings. In April 2015, the RWQCB denied the Company’s request to name the two other potentially responsible parties to the order, but did correct certain findings of fact identified by the Company in its petition for reconsideration. The Company decided not to continue to pursue the administrative appeal and has been complying with RWQCB orders and direction, and is implementing an approved remedial action plan (prepared by an environmental firm retained by the Company) addressing the cleanup of soil, groundwater, and soil vapor at the site. The Company has accrued liabilities where it is probable that a loss will be incurred and the cost or amount of loss can be reasonably estimated. Based on the latest determinations by the RWQCB and the most recent actions taken pursuant to the remedial action plan, the Company continues to estimate the range of probable loss between $5.3 million and $7.2 million . To date, the Company has made $2.6 million in payments towards the remedial action plan. Given the uncertainties associated with environmental assessment and the remediation activities, the Company is unable to determine a best estimate within the range of loss. Therefore, the Company has recorded the minimum amount of probable loss. These estimates could change as a result of changes in planned remedial actions, further actions from the regulatory agency, remediation technology, and other factors. Indemnification The Company has entered into agreements with its current and former executives and directors indemnifying them against certain liabilities incurred in connection with the performance of their duties. The Company’s Certificate of Incorporation and Bylaws contain comparable indemnification obligations with respect to the Company’s current directors and employees. Product Warranties The Company’s general warranty policy provides for repair or replacement of defective parts. In some cases, a refund of the purchase price is offered. In certain instances the Company has agreed to other or additional warranty terms, including indemnification provisions. The product warranty accrual reflects the Company’s best estimate of probable liability under its product warranties. The Company accrues for known warranty issues if a loss is probable and can be reasonably estimated, and accrues for estimated incurred but unidentified issues based on historical experience. Historically, warranty expense has been immaterial to the Company’s consolidated financial statements. Earn-out Liability Pursuant to the terms of an amended earn-out arrangement ("Cycleo Earn-out") with the former shareholders of Cycleo SAS ("Cycleo Earn-out Beneficiaries"), which the Company acquired in March 2012, as of October 28, 2018 , the Company potentially may make payments totaling up to approximately $12.5 million based on the achievement of a combination of certain revenue and operating income milestones over a defined period ("Cycleo Defined Earn-out Period"). The Cycleo Defined Earn-out Period covers the period April 27, 2015 to April 26, 2020. For certain of the Cycleo Earn-out Beneficiaries, payment of the earn-out liability is contingent upon continued employment and is accounted for as post-acquisition compensation expense over the service period. The portion of the earn-out liability that is not dependent on continued employment is not considered as compensation expense. The Company has recorded a liability for the Cycleo Earn-out of $4.3 million and $5.5 million as of October 28, 2018 and January 28, 2018 , respectively. Pursuant to the terms of an earn-out arrangement ("AptoVision Earn-out") with the former shareholders of AptoVision, which the Company acquired in July 2017, as of October 28, 2018 , the Company potentially may make payments totaling up to approximately $47.0 million based on the achievement of a combination of certain net revenue, adjusted earnings and product development targets measured from the acquisition date through July 26, 2020. A summary of earn-out liabilities, included in "Accrued liabilities" and "Other long-term liabilities" on the Balance Sheets, by classification follows: Balance at October 28, 2018 Balance at January 28, 2018 (in thousands) Cycleo AptoVision Total Cycleo AptoVision Total Compensation expense $ 3,801 $ — $ 3,801 $ 4,408 $ — $ 4,408 Not conditional upon continued employment 462 2,161 2,623 668 21,000 21,668 Interest expense — — — 444 — 444 Total liability $ 4,263 $ 2,161 $ 6,424 $ 5,520 $ 21,000 $ 26,520 Amount expected to be settled within twelve months $ 2,334 $ 1,298 $ 3,632

Segment Information

Segment Information	9 Months Ended
	Oct. 28, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Segment Information The Company’s CEO functions as the CODM. The Company’s CODM makes operating decisions and assesses performance based on these operating segments. As part of a realignment strategy, during the first quarter of fiscal year 2019, the Company restructured and combined the Power and High Reliability operating segment with the Wireless and Sensing operating segment to better align resources with our LoRa® initiatives. This resulted in the Company having three operating segments compared to previously having four operating segments. The three operating segments: Protection, Signal Integrity, and Wireless and Sensing, all have similar economic characteristics and have been aggregated into one reportable segment identified in the table below as the "Semiconductor Products Group". The Company’s assets are commingled among the various operating segments and the CODM does not use that information in making operating decisions or assessing performance. Therefore, the Company has not included asset information by segment below. Net sales by segment are as follows: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Semiconductor Products Group $ 173,550 $ 150,304 $ 467,190 $ 447,233 Total $ 173,550 $ 150,304 $ 467,190 $ 447,233 Income by segment and reconciliation to consolidated operating income: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Semiconductor Products Group $ 52,738 $ 42,828 $ 140,660 $ 124,906 Operating income by segment 52,738 42,828 140,660 124,906 Items to reconcile segment operating income to consolidated income before taxes Share-based compensation 11,466 15,356 60,947 44,166 Intangible amortization 6,480 7,453 19,921 20,414 Investment impairments, net of offsets 30,000 4,000 30,000 4,000 Changes in the fair value of contingent earn-out obligations (8,519 ) 188 (9,419 ) 188 Litigation cost net of recoveries (264 ) — (5,476 ) — Other non-segment related expenses 1,708 2,252 2,981 5,221 Amortization of fair value adjustments related to acquired property, plant and equipment — — — 190 Interest expense, net 2,355 2,032 6,745 6,107 Non-operating expense, net (1,182 ) (5,267 ) (1,914 ) (4,431 ) Income before taxes $ 10,694 $ 16,814 $ 36,875 $ 49,051 Information by Product Line The Company operates exclusively in the semiconductor industry and primarily within the analog and mixed-signal sector. The table below provides net sales activity by product line on a comparative basis: Three Months Ended Nine Months Ended (in thousands, except percentages) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Signal Integrity $ 69,981 40 % $ 63,921 42 % $ 204,381 44 % $ 198,645 43 % Protection 53,085 31 % 49,366 33 % 139,875 30 % 136,673 31 % Wireless and Sensing 50,484 29 % 43,266 29 % 144,435 31 % 126,641 29 % Other: Warrant Shares (1) — — % (6,249 ) (4 )% (21,501 ) (5 )% (14,726 ) (3 )% Total net sales $ 173,550 100 % $ 150,304 100 % $ 467,190 100 % $ 447,233 100 % (1) The cost of the Warrant granted was recognized as an offset to net sales over the respective performance period. The Warrant is now fully-vested and exercisable for a total of 869,565 shares, with no additional costs to be recognized in future periods following the first quarter of fiscal year 2019. Information by Sales Channel Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Distributor $ 120,009 $ 103,463 $ 332,304 $ 298,089 Direct 53,541 53,090 156,387 163,870 Other: Warrant Shares — (6,249 ) (21,501 ) (14,726 ) Total net sales $ 173,550 $ 150,304 $ 467,190 $ 447,233 Geographic Information The Company generates virtually all of its sales from its Semiconductor Products Group through sales of analog and mixed-signal devices. Net sales activity by geographic region is as follows: Three Months Ended Nine Months Ended October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Asia-Pacific 77 % 75 % 74 % 74 % North America 16 % 21 % 26 % 21 % Europe 7 % 8 % 7 % 8 % Other: Warrant Shares — % (4 )% (7 )% (3 )% 100 % 100 % 100 % 100 % The Company attributes sales to a country based on the ship-to address. The table below summarizes sales activity to countries that represented greater than 10% of total net sales for at least one of the periods presented: Three Months Ended Nine Months Ended (percentage of total sales) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 China (including Hong Kong) 55 % 50 % 54 % 50 % United States 10 % 9 % 11 % 9 %

Stock Repurchase Program

Stock Repurchase Program	9 Months Ended
	Oct. 28, 2018
Equity [Abstract]
Stock Repurchase Program	Stock Repurchase Program Stock Repurchase Program The Company maintains a stock repurchase program that was initially approved by its Board of Directors in March 2008. The stock repurchase program does not have an expiration date and the Company’s Board of Directors has authorized expansion of the program over the years. The following table summarizes activity under the program for the presented periods: Three Months Ended Nine Months Ended October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 (in thousands, except number of shares) Shares Value Shares Value Shares Value Shares Value Shares repurchased under the stock repurchase program 536,680 $ 30,000 — $ — 1,677,433 $ 79,738 312,304 $ 10,389 Total treasury shares required 536,680 $ 30,000 — $ — 1,677,433 $ 79,738 312,304 $ 10,389 On May 24, 2018, the Company's Board of Directors authorized the expansion of the stock repurchase program by $250.0 million . As of October 28, 2018 , the Company had repurchased $231.1 million in shares of its common stock under the program since inception and the remaining authorization under the program was $217.3 million . Under the program, the Company may repurchase its common stock at any time or from time to time, without prior notice, subject to market conditions and other considerations. The Company’s repurchases may be made through Rule 10b5-1 and/or Rule 10b-18 or other trading plans, open market purchases, privately negotiated transactions, block purchases or other transactions. The Company intends to fund repurchases under the program from cash on hand. The Company has no obligation to repurchase any shares under the program and may suspend or discontinue it at any time.

Restructuring

Restructuring	9 Months Ended
	Oct. 28, 2018
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring From time to time, the Company takes steps to realign the business to focus on high-growth areas, provide customer value and make the Company more efficient. As a result, the Company has realigned resources and infrastructure, which resulted in restructuring expense of $0.4 million for the nine months ended October 28, 2018 . Restructuring related liabilities are included in "Accrued liabilities" in the Balance Sheets as of October 28, 2018 and January 28, 2018 , respectively. Restructuring charges are presented in "Selling, general and administrative" in the Statements of Income. Activity under the restructuring plans is summarized in the following table: (in thousands) One-time employee termination benefits Contract commitments Total Balance at January 28, 2018 $ 4,063 $ 686 $ 4,749 Charges 443 — 443 Cash payments and adjustments (3,914 ) (443 ) (4,357 ) Balance at October 28, 2018 $ 592 $ 243 $ 835

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Oct. 28, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivatives and Hedging Activities The Company is exposed to certain risk arising from both its business operations and economic conditions and principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company, on a routine basis and in the normal course of business, experiences expenses denominated in Swiss Franc, Canadian Dollar ("CAD") and Great British Pound ("GBP"). Such expenses expose the Company to exchange rate fluctuations between these foreign currencies and the U.S. Dollar ("USD"). The Company uses derivative financial instruments in the form of forward contracts to mitigate risk associated with adverse movements in these foreign currency exchange rates on a portion of foreign denominated expenses expected to be realized during the current and following fiscal year. Currency forward contracts involve fixing the exchange rate for delivery of a specified amount of foreign currency on a specified date. The Company’s accounting treatment for these instruments is based on whether or not the instruments are designated as a hedging instrument. The Company is currently applying hedge accounting to all foreign currency derivatives and has designated these hedges as cash flow hedges. At October 28, 2018 , the Company had the following outstanding foreign exchange contracts: (in thousands) Foreign Exchange Contracts Number of Instruments Sell Notional Value Buy Notional Value Sell USD/Buy CAD Forward Contract 3 $ 4,284 C$ 5,500 Sell USD/Buy GBP Forward Contract 11 $ 7,792 £ 6,000 Total 14 These contracts met the criteria for cash flow hedges and the unrealized gains or losses, after tax, are recorded as a component of "Accumulated other comprehensive loss" in the Balance Sheet. The effective portions of cash flow hedges are recorded in accumulated other comprehensive income or loss ("AOCI") until the hedged item is recognized in SG&A expense in the Statements of Income when the underlying hedged expense is recognized. Any ineffective portions of cash flow hedges are recorded in "Non-operating expense, net" in the Statements of Income. The Company presents its derivative assets and liabilities at their gross fair values on the Balance Sheets. The Company had no outstanding foreign exchange contracts at January 28, 2018 . The table below summarizes the carrying values of derivative instruments as of October 28, 2018 : Carrying Values of Derivative Instruments as of October 28, 2018 (in thousands) Fair Value - Assets (2) Fair Value - (Liabilities) (2) Derivative Net Carrying Value Derivatives designated as hedging instruments Foreign exchange contracts (1) $ — $ (120 ) $ (120 ) Total derivatives $ — $ (120 ) $ (120 ) (1) Assets are included in "Other current assets" and liabilities are included in "Accrued liabilities" in the Balance Sheets. (2) The fair values of the foreign exchange forward contracts are valued using Level 2 inputs. Please refer to Note 6 . The following table summarizes the amount of income recognized from derivative instruments for the three months ended October 28, 2018 and October 29, 2017 as well as the line items in the accompanying Statements of Income where the results are recorded for cash flow hedges: Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain or Loss into Income (Effective Portion) Amount of Gain Reclassified from AOCI into Income (Effective Portion) Location of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Three Months Ended Three Months Ended Three Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Sell USD/Buy CAD Forward Contract $ 9 $ (184 ) SG&A $ 41 $ (442 ) SG&A $ 1 $ (1 ) Sell USD/Buy GBP Forward Contract 1 (9 ) SG&A (21 ) (208 ) SG&A — — $ 10 $ (193 ) $ 20 $ (650 ) $ 1 $ (1 ) The following table summarizes the amount of income recognized from derivative instruments for the nine months ended October 28, 2018 and October 29, 2017 as well as the line items in the accompanying Statements of Income where the results are recorded for cash flow hedges: Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain or Loss into Income (Effective Portion) Amount of Gain Reclassified from AOCI into Income (Effective Portion) Location of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Nine Months Ended Nine Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Sell USD/Buy CAD Forward Contract $ (149 ) $ 819 SG&A $ 73 $ (532 ) SG&A $ 1 $ (4 ) Sell USD/Buy GBP Forward Contract 1 296 SG&A (21 ) (428 ) SG&A — — $ (148 ) $ 1,115 $ 52 $ (960 ) $ 1 $ (4 ) The estimated net amount of the existing losses that are reported in accumulated other comprehensive income as of October 28, 2018 that is expected to be reclassified into earnings within the next twelve months was $0.1 million .

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policy)	9 Months Ended
	Oct. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fiscal Year	Fiscal Year The Company reports results on the basis of 52 and 53 week periods and ends its fiscal year on the last Sunday in January. The other quarters generally end on the last Sunday of April, July and October. All quarters consist of 13 weeks except for one 14 -week period in the fourth quarter of 53 -week years. The third quarter of fiscal years 2019 and 2018 each consisted of 13 weeks.
Principles of Consolidation	Principles of Consolidation The accompanying interim unaudited condensed consolidated financial statements have been prepared by the Company, in accordance with accounting principles generally accepted in the United States ("GAAP") and on the same basis as the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 28, 2018 ("Annual Report"). In the opinion of the Company, these interim unaudited condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to present fairly, in all material respects, the financial position of the Company for the interim periods presented. All intercompany balances have been eliminated. Certain information and footnote disclosures normally included in annual consolidated financial statements have been condensed or omitted pursuant to the rules and regulations of the U.S. Securities and Exchange Commission. Because the interim unaudited condensed consolidated financial statements do not include all of the information and notes required by GAAP for a complete set of consolidated financial statements, they should be read in conjunction with the audited consolidated financial statements and notes included in the Company's Annual Report. The results reported in these interim unaudited condensed consolidated financial statements should not be regarded as indicative of results that may be expected for any subsequent period or for the entire year. The Company’s interim unaudited condensed consolidated statements of income are referred to herein as the "Statements of Income." The Company’s interim unaudited condensed consolidated balance sheets are referred to herein as the "Balance Sheets" and interim unaudited condensed consolidated statements of cash flows as the "Statements of Cash Flows."
Segment Information	Segment Information The Company’s Chief Executive Officer ("CEO") has been identified as the Chief Operating Decision Maker ("CODM") as defined by guidance regarding segment disclosures (see Note 12 for further discussion). Prior to the first quarter of fiscal year 2019, the Company had four operating segments that aggregated into one reportable segment. Beginning with the first quarter of fiscal year 2019, the Company identified three operating segments that aggregate into one reportable segment, the Semiconductor Products Group.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Recent Accounting Pronouncements	Recent Accounting Standards Adopted In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Accounting Standards Codification ("ASC") 606), which requires an entity to recognize revenue from the transfer of control of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance addresses, in particular, contracts with more than one performance obligation, as well as the accounting for some costs to obtain or fulfill a contract with a customer, and provides for additional disclosures with respect to revenues and cash flows arising from contracts with customers. The Company adopted the standard, effective January 29, 2018, using the modified retrospective transition method which resulted in an adjustment to retained earnings for the cumulative effect of applying the standard to all contracts not completed as of the adoption date. The primary change associated with the adoption relates to the Company’s sales to distributors with return or price adjustment rights where the Company will no longer defer revenue until the resale by the distributor to the end customer, but rather, will record revenue at the time control transfers to the distributor. The Company estimated the effects of returns and allowances provided to these distributors. Upon adoption, including the effect of income taxes, opening retained earnings as of January 29, 2018 increased by $11.1 million net, as a result of these changes. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Asset Transfers Other Than Inventory (Topic 740). This accounting standard update is aimed at recognizing the income tax consequences of intra-entity transfers of assets other than inventory when they occur. This removes the exception to postpone the recognition of income tax consequences of intra-entity transfers until the asset has been sold to an outside party. In the first quarter of 2019, the Company adopted ASU 2016-16 using a modified retrospective transition method, resulting in a $1.8 million decrease in retained earnings, a $3.7 million net increase in deferred income tax assets, and a $5.5 million decrease in pre-paid taxes. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (Topic 230). The primary purpose of this ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. In the first quarter of fiscal year 2019, the Company adopted ASU 2016-15. Accounting Guidance Issued but Not Adopted as of October 28, 2018 In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which will require that substantially all leases be recognized by lessees on their balance sheets as a right-of-use asset and corresponding lease liability, including leases currently accounted for as operating leases with the exception of short-term leases. Public entities are required to apply the amendments for annual periods beginning after December 15, 2018 and for interim periods within those annual periods. The Company will adopt this update beginning in the first quarter of fiscal year 2020 utilizing the modified retrospective transition method by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company expects to elect certain practical expedients permitted under the transition guidance within the standard. The Company is currently in the process of determining the impact that the updated accounting guidance will have on its consolidated financial statements.
Earnings Per Share	Basic earnings per common share is computed by dividing income available to common stockholders by the weighted-average number of shares of common stock outstanding during the reporting period. Diluted earnings per common share incorporates the incremental shares issuable, calculated using the treasury stock method, upon the assumed exercise of non-qualified stock options, the vesting of restricted stock units and performance unit awards if the conditions have been met.
Share-based Compensation, Warrant	The Warrant was issued by the Company to Comcast in connection with an agreement between the parties regarding the intended trial deployment by Comcast of a low-power wide-area network in the United States ("U.S."), based on the Company’s LoRa® devices and wireless radio frequency technology. The Warrant was accounted for as equity and the cost was recognized as an offset to net sales over the respective performance period. The Warrant consisted of five performance tranches. The cost associated with each tranche had been recognized based on the fair value at each reporting date until vesting which was the measurement date.
Share-based Compensation, Performance-based RSUs	The Company grants performance-based restricted stock units to select employees. The performance-based restricted stock units are valued as of the measurement date and expense is recognized on a straight line basis for the awards expected to vest based on the probability of attainment of the performance condition for each separately vesting portion of the award.
Fair Value of Financial Instruments	As of October 28, 2018 and January 28, 2018 , the Company had not elected the fair value option for any financial assets and liabilities for which such an election would have been permitted. The fair values of the foreign exchange forward contracts are valued using Level 2 inputs. Foreign currency forward contracts are valued using readily available foreign currency forward and interest rate curves. The fair value of each contract is determined by comparing the contract rate to the forward rate and discounting to the present value. Contracts in a gain position are recorded in the Balance Sheets within the caption "Other current assets" and the value of contracts in a loss position are recorded within the caption "Accrued liabilities" in the Balance Sheets. Please see Note 15 for further discussion of the Company’s derivative instruments. The convertible debt is valued using probability weighted cash flows (Level 3 inputs). The AptoVision Earn-out liability (see Note 11 ) is valued utilizing estimates of annual revenue, adjusted earnings and product development targets (Level 3 inputs) through July 2020. These estimates represent inputs for which market data are not available and are developed using the best information available about the assumptions that market participants would use when pricing the liability. The Cycleo Earn-out liability (see Note 11 ) is valued utilizing estimates of annual revenue and operating income (Level 3 inputs) through April 2020. These estimates represent inputs for which market data are not available and are developed using the best information available about the assumptions that market participants would use when pricing the liability. The Company measures contingent earn-out liabilities at fair value on a recurring basis using significant unobservable inputs classified within Level 3 of the fair value hierarchy. The Company uses a Monte Carlo valuation method as a valuation technique to determine the value of the earn-out liability. The significant unobservable inputs used in the fair value measurements are revenue projections over the earn-out period, and the probability outcome percentages assigned to each scenario. Significant increases or decreases to either of these inputs in isolation would result in a significantly higher or lower liability, with a higher liability capped by the contractual maximum of the contingent earn-out obligation. Ultimately, the liabilities will be equivalent to the amount paid, and the difference between the fair value estimate and amount paid will be recorded in earnings. For the Cycleo Earn-out and AptoVision Earn-out, these companies have business profiles comparable to a start-up company. Accordingly, their respective revenue projections are subject to significant revisions. This characteristic can result in volatile changes to the measurement of fair value for a given earn-out. The Company reviews and re-assesses the estimated fair value of contingent consideration on a recurring basis, and the updated fair value could differ materially from the previous estimates. Adjustments to the estimated fair value related to changes in all other unobservable inputs are reported in operating income. Instruments Not Recorded at Fair Value on a Recurring Basis Some of the Company’s financial instruments are not measured at fair value on a recurring basis but are recorded at amounts that approximate fair value due to their liquid or short-term nature. Such financial assets and financial liabilities include: cash and cash equivalents including money market deposits, net receivables, certain other assets, accounts payable, accrued expenses, accrued personnel costs, and other current liabilities. The Company’s long-term debt is not recorded at fair value on a recurring basis, but is measured at fair value for disclosure purposes. Assets and Liabilities Recorded at Fair Value on a Non-Recurring Basis The Company reduces the carrying amounts of its goodwill, intangible assets, long-lived assets and non-marketable equity securities to fair value when held for sale or determined to be impaired.
Inventory	Inventories, consisting of material, material overhead, labor, and manufacturing overhead, are stated at the lower of cost (first-in, first-out) or market
Interest and Penalties on Unrecognized Tax Benefits	The Company’s policy is to include net interest and penalties related to unrecognized tax benefits within the "Provision for taxes" in the Statements of Income.
Commitments and Contingencies	In accordance with accounting standards regarding loss contingencies, the Company accrues an undiscounted liability for those contingencies where the incurrence of a loss is probable and the amount can be reasonably estimated. The Company also discloses the amount accrued and the amount of a reasonably possible loss in excess of the amount accrued, if such disclosure is necessary for its consolidated financial statements not to be misleading. The Company does not record liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated, or when the liability is believed to be only reasonably possible or remote. The Company evaluates, at least quarterly, developments in its legal matters that could affect the amount of liability that has been previously accrued, and makes adjustments as appropriate. Significant judgment is required to determine both probability and the estimated amount. The Company may be unable to estimate a possible loss or range of possible loss due to various reasons, including, among others: (i) if the damages sought are indeterminate; (ii) if the proceedings are in early stages, (iii) if there is uncertainty as to the outcome of pending appeals, motions or settlements, (iv) if there are significant factual issues to be determined or resolved, and (v) if there are novel or unsettled legal theories presented. In such instances, there is considerable uncertainty regarding the ultimate resolution of such matters, including a possible eventual loss, if any. Because the outcomes of litigation and other legal matters are inherently unpredictable, the Company’s evaluation of legal matters or proceedings often involves a series of complex assessments by management about future events and can rely heavily on estimates and assumptions. While the consequences of certain unresolved matters and proceedings are not presently determinable, and an estimate of the probable and reasonably possible loss or range of loss in excess of amounts accrued for such proceedings cannot be reasonably made, an adverse outcome from such proceedings could have a material adverse effect on the Company’s earnings in any given reporting period. However, in the opinion of management, after consulting with legal counsel, any ultimate liability related to current outstanding claims and lawsuits, individually or in the aggregate, is not expected to have a material adverse effect on the Company’s consolidated financial statements, as a whole. However, legal matters are inherently unpredictable and subject to significant uncertainties, some of which are beyond the Company’s control.
Product Warranties	Product Warranties The Company’s general warranty policy provides for repair or replacement of defective parts. In some cases, a refund of the purchase price is offered. In certain instances the Company has agreed to other or additional warranty terms, including indemnification provisions. The product warranty accrual reflects the Company’s best estimate of probable liability under its product warranties. The Company accrues for known warranty issues if a loss is probable and can be reasonably estimated, and accrues for estimated incurred but unidentified issues based on historical experience. Historically, warranty expense has been immaterial to the Company’s consolidated financial statements.
Derivatives	The Company’s accounting treatment for these instruments is based on whether or not the instruments are designated as a hedging instrument. The Company is currently applying hedge accounting to all foreign currency derivatives and has designated these hedges as cash flow hedges. These contracts met the criteria for cash flow hedges and the unrealized gains or losses, after tax, are recorded as a component of "Accumulated other comprehensive loss" in the Balance Sheet. The effective portions of cash flow hedges are recorded in accumulated other comprehensive income or loss ("AOCI") until the hedged item is recognized in SG&A expense in the Statements of Income when the underlying hedged expense is recognized. Any ineffective portions of cash flow hedges are recorded in "Non-operating expense, net" in the Statements of Income. The Company presents its derivative assets and liabilities at their gross fair values on the Balance Sheets.
Revenue	The Company derives its revenue primarily from the sale of semiconductor products into various end markets. Revenue is recognized when control of these products is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for these products. Control is generally transferred when products are shipped and, to a lesser extent, when the products are delivered. Recovery of costs associated with product design and engineering services are recognized during the period in which services are performed and are reported as a reduction to product development and engineering expense. Historically, these recoveries have not exceeded the cost of the related development efforts. The Company includes revenue related to granted technology licenses as part of "Net sales" in the Statements of Income. Historically, revenue from these arrangements has not been significant though it is part of its recurring ordinary business. The Company determines revenue recognition through the following five steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, performance obligations are satisfied. The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The Company’s revenue contracts generally represent a single performance obligation to sell its products to trade customers. Net sales reflect the transaction prices for contracts, which include units shipped at selling prices reduced by variable consideration. Determination of variable consideration requires judgment by the Company. Variable consideration includes expected sales returns and other price adjustments. Variable consideration is estimated using the expected value method considering all reasonably available information, including the Company’s historical experience and its current expectations, and is reflected in the transaction price when sales are recorded. Sales returns are generally accepted at the Company’s discretion or from distributors with such rights. The Company’s contracts with trade customers do not have significant financing components or non-cash consideration. The Company records net sales excluding taxes collected on its sales to its trade customers. The Company provides an assurance type warranty which is typically not sold separately and does not represent a separate performance obligation. The Company’s payment terms are generally aligned with shipping terms.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Oct. 28, 2018
Revenue from Contract with Customer [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following presents the amounts by which financial statement line items were affected in the current periods due to the adoption of ASC 606 as compared with the guidance that was in effect before the change: Three Months Ended Nine Months Ended Statements of Income October 28, 2018 October 28, 2018 (in thousands, except per share amounts) Increase/(decrease) Increase/(decrease) Net sales $ 3,251 $ 9,597 Cost of sales $ 746 $ 2,190 Provision for taxes $ 526 $ 1,555 Net income $ 1,979 $ 5,851 Earnings per share: Basic $ 0.03 $ 0.09 Diluted $ 0.03 $ 0.09 Balance Sheets October 28, 2018 (in thousands) Increase/(decrease) Deferred revenue $ (19,889 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Oct. 28, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Common Share	The computation of basic and diluted earnings per common share was as follows: Three Months Ended Nine Months Ended (in thousands, except per share amounts) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Net income $ 12,165 $ 13,338 $ 49,716 $ 37,723 Weighted average common shares outstanding - basic 66,014 66,194 66,134 65,932 Dilutive effect of stock options and restricted stock units 2,717 1,623 2,415 1,623 Weighted average common shares outstanding - diluted 68,731 67,817 68,549 67,555 Basic earnings per common share $ 0.18 $ 0.20 $ 0.75 $ 0.57 Diluted earnings per common share $ 0.18 $ 0.20 $ 0.73 $ 0.56 Anti-dilutive shares not included in the above calculations 289 362 496 447

Share-Based Compensation (Table

Share-Based Compensation (Tables)	9 Months Ended
	Oct. 28, 2018
Share-based Compensation [Abstract]
Allocation Of Stock-Based Compensation	The following table summarizes pre-tax share-based compensation included in the Statements of Income for the three and nine months ended October 28, 2018 and October 29, 2017 . Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Revenue offset $ — $ 6,249 $ 21,501 $ 14,726 Cost of sales 477 316 1,110 1,161 Selling, general and administrative 8,478 6,589 31,318 22,200 Product development and engineering 2,511 2,202 7,018 6,079 Share-based compensation $ 11,466 $ 15,356 $ 60,947 $ 44,166 Net change in share-based compensation capitalized into inventory $ — $ — $ — $ (414 )

Investments (Tables)

Investments (Tables)	9 Months Ended
	Oct. 28, 2018
Investments [Abstract]
Summary Of Investments	The following table summarizes the Company’s available-for-sale securities: October 28, 2018 January 28, 2018 (in thousands) Market Value Adjusted Cost Gross Unrealized Gain Market Value Adjusted Cost Gross Unrealized Gain Convertible debt $ 3,105 $ 3,105 $ — $ 1,960 $ 1,960 $ — Total other assets $ 3,105 $ 3,105 $ — $ 1,960 $ 1,960 $ —
Schedule Of Investments, Classified By Maturity Period	The following table summarizes the maturities of the Company’s available-for-sale securities: October 28, 2018 January 28, 2018 (in thousands) Market Value Adjusted Cost Market Value Adjusted Cost Within 1 year $ 2,000 $ 2,000 $ 1,960 $ 1,960 After 1 year through 5 years 1,105 1,105 — — Total investments $ 3,105 $ 3,105 $ 1,960 $ 1,960

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Oct. 28, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	Financial assets and liabilities measured and recorded at fair value on a recurring basis were presented in the Company's Balance Sheets as follows: Fair Value as of October 28, 2018 Fair Value as of January 28, 2018 (in thousands) Total (Level 1) (Level 2) (Level 3) Total (Level 1) (Level 2) (Level 3) Financial assets: Convertible debt $ 3,105 $ — $ — $ 3,105 $ 1,960 $ — $ — $ 1,960 Total financial assets $ 3,105 $ — $ — $ 3,105 $ 1,960 $ — $ — $ 1,960 Financial liabilities: AptoVision Earn-out $ 2,161 $ — $ — $ 2,161 $ 21,000 $ — $ — $ 21,000 Cycleo Earn-out 462 — — 462 668 — — 668 Derivative financial instruments 120 — 120 — — — — — Total financial liabilities $ 2,743 $ — $ 120 $ 2,623 $ 21,668 $ — $ — $ 21,668
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	A reconciliation of the change in the earn-out liability during the nine months ended October 28, 2018 is as follows: (in thousands) AptoVision Cycleo Total Balance at January 28, 2018 $ 21,000 $ 668 $ 21,668 Changes in the fair value of contingent earn-out obligations (9,419 ) — (9,419 ) Payments (9,420 ) (206 ) (9,626 ) Balance as of October 28, 2018 $ 2,161 $ 462 $ 2,623

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Oct. 28, 2018
Inventory Disclosure [Abstract]
Summary Of Inventories	Inventories, consisting of material, material overhead, labor, and manufacturing overhead, are stated at the lower of cost (first-in, first-out) or market and consist of the following: (in thousands) October 28, 2018 January 28, 2018 Raw materials $ 2,145 $ 1,651 Work in progress 41,820 46,884 Finished goods 17,194 22,532 Inventories $ 61,159 $ 71,067

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Oct. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amounts of Goodwill	Changes in the carrying amount of goodwill by applicable reporting unit were as follows: (in thousands) Signal Integrity Wireless and Sensing Protection Total Balance at January 28, 2018 $ 274,085 $ 67,812 $ — $ 341,897 Additions — 8,500 4,778 13,278 Balance at October 28, 2018 $ 274,085 $ 76,312 $ 4,778 $ 355,175
Schedule of Finite-lived Intangible Assets Acquired	The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which continue to be amortized: October 28, 2018 January 28, 2018 (in thousands) Estimated Useful Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Core technologies 5-8 years $ 164,930 $ (131,250 ) $ 33,680 $ 164,930 $ (115,628 ) $ 49,302 Customer relationships 3-10 years 34,031 (29,725 ) 4,306 34,031 (25,426 ) 8,605 Total finite-lived intangible assets $ 198,961 $ (160,975 ) $ 37,986 $ 198,961 $ (141,054 ) $ 57,907 Amortization expenses recorded in the Statements of Income for each period were as follows: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Core technologies $ 5,047 $ 6,020 $ 15,622 $ 16,669 Customer relationships 1,433 1,433 4,299 3,745 Total amortization expense $ 6,480 $ 7,453 $ 19,921 $ 20,414
Schedule of Indefinite-Lived Intangible Assets	The following table sets forth the Company’s indefinite-lived intangible assets resulting from additions to in-process research and development: (in thousands) Net Carrying Value Value at January 28, 2018 $ 2,300 In-process research and development through acquisitions — Value at October 28, 2018 $ 2,300

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Oct. 28, 2018
Debt Instruments [Abstract]
Schedule of Long-term Debt	Long-term debt and the current period interest rates were as follows: Balance as of (in thousands) October 28, 2018 January 28, 2018 Term loans $ 120,000 $ 131,250 Revolving loans 97,000 97,000 Total debt 217,000 228,250 Current portion (18,256 ) (15,410 ) Total long-term debt 198,744 212,840 Debt issuance costs (1,327 ) (1,726 ) Total long-term debt, net of debt issuance costs $ 197,417 $ 211,114 Weighted-average interest rate 3.87 % 3.19 %
Schedule Maturities of Current and Long-term Term Loans	Scheduled maturities of current and long-term Term Loans are as follows: (in thousands) Fiscal Year Ending: 2019 $ 4,688 2020 18,750 2021 19,687 2022 76,875 Total Term Loans $ 120,000

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Oct. 28, 2018
Income Tax Disclosure [Abstract]
Summary of Income Tax Contingencies	A reconciliation of the beginning and ending amount of gross unrecognized tax benefits (before the federal impact of state items) is as follows: (in thousands) Balance at January 28, 2018 $ 16,059 Additions based on tax positions related to the current year 2,145 Balance as of October 28, 2018 $ 18,204
Liability For Uncertain Tax Positions	The liability for UTP is reflected in the Balance Sheets as follows: (in thousands) October 28, 2018 January 28, 2018 Deferred tax assets - non-current $ 12,468 $ 12,135 Other long-term liabilities 5,736 3,924 Total accrued taxes $ 18,204 $ 16,059
Regional Income (Loss) From Continuing Operations Before Income Taxes	The Company’s regional income from continuing operations before taxes and equity in net losses of equity method investments is as follows: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Domestic $ (1,647 ) $ (2,366 ) $ (12,871 ) $ (11,396 ) Foreign 12,341 19,180 49,746 60,447 Total $ 10,694 $ 16,814 $ 36,875 $ 49,051

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Oct. 28, 2018
Commitments and Contingencies Disclosure [Abstract]
Summary of Earn-out Liabilities by Classification	A summary of earn-out liabilities, included in "Accrued liabilities" and "Other long-term liabilities" on the Balance Sheets, by classification follows: Balance at October 28, 2018 Balance at January 28, 2018 (in thousands) Cycleo AptoVision Total Cycleo AptoVision Total Compensation expense $ 3,801 $ — $ 3,801 $ 4,408 $ — $ 4,408 Not conditional upon continued employment 462 2,161 2,623 668 21,000 21,668 Interest expense — — — 444 — 444 Total liability $ 4,263 $ 2,161 $ 6,424 $ 5,520 $ 21,000 $ 26,520 Amount expected to be settled within twelve months $ 2,334 $ 1,298 $ 3,632

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Oct. 28, 2018
Segment Reporting Information [Line Items]
Net Sales by Segment	Net sales by segment are as follows: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Semiconductor Products Group $ 173,550 $ 150,304 $ 467,190 $ 447,233 Total $ 173,550 $ 150,304 $ 467,190 $ 447,233
Income by Segment and Reconciliation to Consolidated Operating Income	Income by segment and reconciliation to consolidated operating income: Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Semiconductor Products Group $ 52,738 $ 42,828 $ 140,660 $ 124,906 Operating income by segment 52,738 42,828 140,660 124,906 Items to reconcile segment operating income to consolidated income before taxes Share-based compensation 11,466 15,356 60,947 44,166 Intangible amortization 6,480 7,453 19,921 20,414 Investment impairments, net of offsets 30,000 4,000 30,000 4,000 Changes in the fair value of contingent earn-out obligations (8,519 ) 188 (9,419 ) 188 Litigation cost net of recoveries (264 ) — (5,476 ) — Other non-segment related expenses 1,708 2,252 2,981 5,221 Amortization of fair value adjustments related to acquired property, plant and equipment — — — 190 Interest expense, net 2,355 2,032 6,745 6,107 Non-operating expense, net (1,182 ) (5,267 ) (1,914 ) (4,431 ) Income before taxes $ 10,694 $ 16,814 $ 36,875 $ 49,051
Net Sales Activity By Product Line	The table below provides net sales activity by product line on a comparative basis: Three Months Ended Nine Months Ended (in thousands, except percentages) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Signal Integrity $ 69,981 40 % $ 63,921 42 % $ 204,381 44 % $ 198,645 43 % Protection 53,085 31 % 49,366 33 % 139,875 30 % 136,673 31 % Wireless and Sensing 50,484 29 % 43,266 29 % 144,435 31 % 126,641 29 % Other: Warrant Shares (1) — — % (6,249 ) (4 )% (21,501 ) (5 )% (14,726 ) (3 )% Total net sales $ 173,550 100 % $ 150,304 100 % $ 467,190 100 % $ 447,233 100 %
Schedule of Revenue from External Customers by Sales Channel	Three Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Distributor $ 120,009 $ 103,463 $ 332,304 $ 298,089 Direct 53,541 53,090 156,387 163,870 Other: Warrant Shares — (6,249 ) (21,501 ) (14,726 ) Total net sales $ 173,550 $ 150,304 $ 467,190 $ 447,233
Net Sales Activity By Geographic Region	Net sales activity by geographic region is as follows: Three Months Ended Nine Months Ended October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Asia-Pacific 77 % 75 % 74 % 74 % North America 16 % 21 % 26 % 21 % Europe 7 % 8 % 7 % 8 % Other: Warrant Shares — % (4 )% (7 )% (3 )% 100 % 100 % 100 % 100 %
Summary Of Sales Activity To Countries That Represented Greater Than 10% Of Total Net Sales	The table below summarizes sales activity to countries that represented greater than 10% of total net sales for at least one of the periods presented: Three Months Ended Nine Months Ended (percentage of total sales) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 China (including Hong Kong) 55 % 50 % 54 % 50 % United States 10 % 9 % 11 % 9 %

Stock Repurchase Program (Table

Stock Repurchase Program (Tables)	9 Months Ended
	Oct. 28, 2018
Equity [Abstract]
Class of Treasury Stock	The following table summarizes activity under the program for the presented periods: Three Months Ended Nine Months Ended October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 (in thousands, except number of shares) Shares Value Shares Value Shares Value Shares Value Shares repurchased under the stock repurchase program 536,680 $ 30,000 — $ — 1,677,433 $ 79,738 312,304 $ 10,389 Total treasury shares required 536,680 $ 30,000 — $ — 1,677,433 $ 79,738 312,304 $ 10,389

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Oct. 28, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	Activity under the restructuring plans is summarized in the following table: (in thousands) One-time employee termination benefits Contract commitments Total Balance at January 28, 2018 $ 4,063 $ 686 $ 4,749 Charges 443 — 443 Cash payments and adjustments (3,914 ) (443 ) (4,357 ) Balance at October 28, 2018 $ 592 $ 243 $ 835

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Oct. 28, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Open Foreign Currency Contracts	At October 28, 2018 , the Company had the following outstanding foreign exchange contracts: (in thousands) Foreign Exchange Contracts Number of Instruments Sell Notional Value Buy Notional Value Sell USD/Buy CAD Forward Contract 3 $ 4,284 C$ 5,500 Sell USD/Buy GBP Forward Contract 11 $ 7,792 £ 6,000 Total 14
Summary of the Carrying Values of Derivative Instruments	The table below summarizes the carrying values of derivative instruments as of October 28, 2018 : Carrying Values of Derivative Instruments as of October 28, 2018 (in thousands) Fair Value - Assets (2) Fair Value - (Liabilities) (2) Derivative Net Carrying Value Derivatives designated as hedging instruments Foreign exchange contracts (1) $ — $ (120 ) $ (120 ) Total derivatives $ — $ (120 ) $ (120 ) (1) Assets are included in "Other current assets" and liabilities are included in "Accrued liabilities" in the Balance Sheets. (2) The fair values of the foreign exchange forward contracts are valued using Level 2 inputs. Please refer to Note 6 .
Summary of Gain (Loss) Recognized From Derivative Instruments	The following table summarizes the amount of income recognized from derivative instruments for the nine months ended October 28, 2018 and October 29, 2017 as well as the line items in the accompanying Statements of Income where the results are recorded for cash flow hedges: Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain or Loss into Income (Effective Portion) Amount of Gain Reclassified from AOCI into Income (Effective Portion) Location of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Nine Months Ended Nine Months Ended Nine Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Sell USD/Buy CAD Forward Contract $ (149 ) $ 819 SG&A $ 73 $ (532 ) SG&A $ 1 $ (4 ) Sell USD/Buy GBP Forward Contract 1 296 SG&A (21 ) (428 ) SG&A — — $ (148 ) $ 1,115 $ 52 $ (960 ) $ 1 $ (4 ) The following table summarizes the amount of income recognized from derivative instruments for the three months ended October 28, 2018 and October 29, 2017 as well as the line items in the accompanying Statements of Income where the results are recorded for cash flow hedges: Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain or Loss into Income (Effective Portion) Amount of Gain Reclassified from AOCI into Income (Effective Portion) Location of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Amount of Gain or Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Three Months Ended Three Months Ended Three Months Ended (in thousands) October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 October 28, 2018 October 29, 2017 Sell USD/Buy CAD Forward Contract $ 9 $ (184 ) SG&A $ 41 $ (442 ) SG&A $ 1 $ (1 ) Sell USD/Buy GBP Forward Contract 1 (9 ) SG&A (21 ) (208 ) SG&A — — $ 10 $ (193 ) $ 20 $ (650 ) $ 1 $ (1 )

Organization and Basis of Pre_3

Organization and Basis of Presentation (Fiscal Year) (Details)	3 Months Ended		9 Months Ended
	Oct. 28, 2018weeks	Oct. 29, 2017weeks	Oct. 28, 2018weeksweek
52 Week Fiscal Year [Member]
Organization And Basis Of Presentation [Line Items]
Number of weeks in the fiscal year reporting period			52
Number of weeks in a quarter for 52 week fiscal period	13	13	13
53 Week Fiscal Year [Member]
Organization And Basis Of Presentation [Line Items]
Number of weeks in the fiscal year reporting period			53
Number of weeks in the 4th quarter for 53 week fiscal period | week			14

Organization and Basis of Pre_4

Organization and Basis of Presentation (Segment Information) (Details)	9 Months Ended	12 Months Ended
	Oct. 28, 2018reportable_segmentoperating_segment	Jan. 28, 2018operating_segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | operating_segment	3	4
Number of reportable segments | reportable_segment	1

Organization and Basis of Pre_5

Organization and Basis of Presentation (Acquisitions) (Details) - USD ($) $ in Thousands	Aug. 17, 2018	May 02, 2018	Oct. 28, 2018	Jan. 28, 2018
Business Acquisition [Line Items]
Goodwill			$ 355,175	$ 341,897
Trackio International AG [Member]
Business Acquisition [Line Items]
Purchase price	$ 8,500
Goodwill	$ 8,500
IC Interconnect, Inc. [Member]
Business Acquisition [Line Items]
Cash paid to to acquire business		$ 7,300
Goodwill		4,800
Intangibles acquired		$ 2,500

Organization and Basis of Pre_6

Organization and Basis of Presentation (Legal Settlement) (Details) - USD ($) $ in Millions	Aug. 01, 2018	Jul. 29, 2018
Loss Contingencies [Line Items]
Litigation settlement	$ 9
Selling, General and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Litigation settlement		$ 6.6

Organization and Basis of Pre_7

Organization and Basis of Presentation (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2018	Apr. 29, 2018	Jan. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Document Fiscal Year Focus	2,019
Retained earnings	$ 561,589		$ 502,346
Prepaid taxes	$ 11,093		$ 11,809
Accounting Standards Update 2014-09 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 11,100
Accounting Standards Update 2016-16 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		1,800
Deferred tax assets		3,700
Prepaid taxes		$ 5,500

Revenue (Effect of Adoption on

Revenue (Effect of Adoption on Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017	Jan. 28, 2018
Statements of Income
Net sales	$ 173,550	$ 150,304	$ 467,190	$ 447,233
Cost of sales	66,988	60,885	189,035	180,663
Provision for taxes	(1,454)	3,272	(12,882)	11,124
Net income	$ 12,165	$ 13,338	$ 49,716	$ 37,723
Basic (in dollars per share)	$ 0.18	$ 0.20	$ 0.75	$ 0.57
Diluted (in dollars per share)	$ 0.18	$ 0.20	$ 0.73	$ 0.56
Balance Sheets
Other current assets	$ 18,126		$ 18,126		$ 17,250
Accrued liabilities	60,856		60,856		60,832
Deferred revenue	965		965		$ 12,758
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Statements of Income
Net sales	3,251		9,597
Cost of sales	746		2,190
Provision for taxes	526		1,555
Net income	$ 1,979		$ 5,851
Basic (in dollars per share)	$ 0.03		$ 0.09
Diluted (in dollars per share)	$ 0.03		$ 0.09
Balance Sheets
Deferred revenue	$ (19,889)		$ (19,889)

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Earnings Per Share [Abstract]
Net income	$ 12,165	$ 13,338	$ 49,716	$ 37,723
Weighted average common shares outstanding - basic	66,014	66,194	66,134	65,932
Dilutive effect of options and restricted stock units	2,717	1,623	2,415	1,623
Weighted average common shares outstanding - diluted	68,731	67,817	68,549	67,555
Basic earnings per common share (in dollars per share)	$ 0.18	$ 0.20	$ 0.75	$ 0.57
Diluted earnings per common share (in dollars per share)	$ 0.18	$ 0.20	$ 0.73	$ 0.56
Anti-dilutive shares not included in the above calculations	289	362	496	447

Share-Based Compensation - Narr

Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	Apr. 27, 2018shares	Oct. 05, 2016shares	Apr. 29, 2018USD ($)employee$ / sharesshares	Oct. 28, 2018USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares subject to purchase under warrants		1,086,957
Warrants vested (in shares)	586,956
Warrant vesting costs | $				$ 21.5
Warrant vesting costs due to acceleration | $				$ 15.9
Number of securities called by warrants (in shares)				869,565
Document Fiscal Year Focus				2,019
Number of shares affected (in shares)			159,000
Number of employees affected | employee			8
Additional compensation cost | $			$ 2.8
Market Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards granted			200,442
Description of award vesting rights			one-third of the awards vesting each performance period
Performance Period One | Market Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			1 year
Grant date fair value per unit | $ / shares			$ 33.02
Performance Period Two | Market Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			2 years
Grant date fair value per unit | $ / shares			$ 34.85
Performance Period Three | Market Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years
Grant date fair value per unit | $ / shares			$ 36.52

Share-Based Compensation - Allo

Share-Based Compensation - Allocation of Share-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 11,466	$ 15,356	$ 60,947	$ 44,166
Inventories [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Net change in share-based compensation capitalized into inventory	0	0	0	(414)
Revenue Offset [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	0	6,249	21,501	14,726
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	477	316	1,110	1,161
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	8,478	6,589	31,318	22,200
Product Development And Engineering [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 2,511	$ 2,202	$ 7,018	$ 6,079

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Investment [Line Items]
Investment impairments	$ 30,000	$ 4,250	$ 30,000	$ 4,250

Investments - Summary Of Invest

Investments - Summary Of Investments (Details) - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Investment [Line Items]
Available-for-sale securities, market value	$ 3,105	$ 1,960
Available-for-sale securities, adjusted cost	3,105	1,960
Available-for-sale securities, gross unrealized gain	0	0
Convertible debt
Investment [Line Items]
Available-for-sale securities, market value	3,105	1,960
Available-for-sale securities, adjusted cost	3,105	1,960
Available-for-sale securities, gross unrealized gain	$ 0	$ 0

Investments - Summary of Maturi

Investments - Summary of Maturities of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Investment [Line Items]
Available-for-sale securities, market value	$ 3,105	$ 1,960
Available-for-sale securities, adjusted cost	3,105	1,960
Within 1 Year [Member]
Investment [Line Items]
Available-for-sale securities, market value	2,000	1,960
Available-for-sale securities, adjusted cost	2,000	1,960
After 1 Year Through 5 Years [Member]
Investment [Line Items]
Available-for-sale securities, market value	1,105	0
Available-for-sale securities, adjusted cost	$ 1,105	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017	Jan. 28, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment impairments, net of offsets	$ 30,000	$ 4,250	$ 30,000	$ 4,250
Term Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt	120,000		120,000
Level 2 [Member] | Term Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt					$ 131,300
Level 2 [Member] | Revolving Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	$ 97,000		$ 97,000		$ 97,000
Discounted Cash Flow Valuation Technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average cost of capital assumption (in percentage)	38.80%

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total financial assets	$ 3,105	$ 1,960
Derivative financial instruments	120	0
Total financial liabilities	2,743	21,668
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total financial assets	0	0
Derivative financial instruments	0	0
Total financial liabilities	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total financial assets	0	0
Derivative financial instruments	120	0
Total financial liabilities	120	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total financial assets	3,105	1,960
Derivative financial instruments	0	0
Total financial liabilities	2,623	21,668
Convertible debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	3,105	1,960
Convertible debt | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	0	0
Convertible debt | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	0	0
Convertible debt | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	3,105	1,960
AptoVision Technologies Inc.
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	2,161	21,000
AptoVision Technologies Inc. | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
AptoVision Technologies Inc. | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
AptoVision Technologies Inc. | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	2,161	21,000
Cycleo
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	462	668
Cycleo | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
Cycleo | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
Cycleo | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	$ 462	$ 668

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Reconciliation of the Earn-out Liability (Details) $ in Thousands	9 Months Ended
	Oct. 28, 2018USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 21,668
Changes in the fair value of contingent earn-out obligations	(9,419)
Payments	(9,626)
Ending balance	2,623
AptoVision Technologies Inc.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	21,000
Changes in the fair value of contingent earn-out obligations	(9,419)
Payments	(9,420)
Ending balance	2,161
Cycleo
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	668
Changes in the fair value of contingent earn-out obligations	0
Payments	(206)
Ending balance	$ 462

Inventories - Summary of Invent

Inventories - Summary of Inventories (Details) - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 2,145	$ 1,651
Work in progress	41,820	46,884
Finished goods	17,194	22,532
Inventories	$ 61,159	$ 71,067

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Narrative (Details) $ in Millions	9 Months Ended
	Oct. 28, 2018USD ($)
Wireless and Sensing [Member]
Goodwill [Line Items]
Goodwill, Transferred from Other Product Group	$ 49.4

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) $ in Thousands	9 Months Ended
	Oct. 28, 2018USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 341,897
Additions	13,278
Ending balance	355,175
Signal Integrity [Member]
Goodwill [Roll Forward]
Beginning balance	274,085
Additions	0
Ending balance	274,085
Wireless and Sensing [Member]
Goodwill [Roll Forward]
Beginning balance	67,812
Additions	8,500
Ending balance	76,312
Protection [Member]
Goodwill [Roll Forward]
Beginning balance	0
Additions	4,778
Ending balance	$ 4,778

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2018	Jan. 28, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 198,961	$ 198,961
Accumulated amortization	(160,975)	(141,054)
Net carrying amount	37,986	57,907
Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	164,930	164,930
Accumulated amortization	(131,250)	(115,628)
Net carrying amount	$ 33,680	49,302
Core Technologies [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years
Core Technologies [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	8 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 34,031	34,031
Accumulated amortization	(29,725)	(25,426)
Net carrying amount	$ 4,306	$ 8,605
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Goodwill [Line Items]
Intangible amortization	$ 6,480	$ 7,453	$ 19,921	$ 20,414
Core Technologies [Member]
Goodwill [Line Items]
Intangible amortization	5,047	6,020	15,622	16,669
Customer Relationships [Member]
Goodwill [Line Items]
Intangible amortization	$ 1,433	$ 1,433	$ 4,299	$ 3,745

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets - Schedule of Indefinite-lived Intangible Assets Resulting From Additions to IPR&D (Details) $ in Thousands	9 Months Ended
	Oct. 28, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance, net carrying amount	$ 2,300
In-process research and development through acquisitions	0
Ending balance, net carrying amount	$ 2,300

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Debt Instrument [Line Items]
Total debt	$ 217,000	$ 228,250
Current portion	(18,256)	(15,410)
Total long-term debt	198,744	212,840
Debt issuance costs	(1,327)	(1,726)
Total long-term debt, net of debt issuance costs	$ 197,417	$ 211,114
Weighted-average interest rate	3.87%	3.19%
Term Loans [Member]
Debt Instrument [Line Items]
Total debt	$ 120,000	$ 131,250
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 97,000	$ 97,000

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details) - USD ($)	Oct. 28, 2018	Nov. 15, 2016
Term Loans [Member]
Facilities, maximum borrowing capacity		$ 150,000,000
Revolving Credit Facility [Member]
Facilities, maximum borrowing capacity		$ 250,000,000
Undrawn revolving commitments	$ 153,000,000
Swingline Loans [Member]
Amounts outstanding	0
Foreign Line of Credit [Member]
Amounts outstanding	$ 0

Long-Term Debt - Scheduled Matu

Long-Term Debt - Scheduled Maturities of Term Loans (Details) - Term Loans [Member] $ in Thousands	Oct. 28, 2018USD ($)
Debt Instrument [Line Items]
2,019	$ 4,688
2,020	18,750
2,021	19,687
2,022	76,875
Total debt	$ 120,000

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 28, 2018	Oct. 28, 2018	Jan. 28, 2018
Income Tax Disclosure [Abstract]
Statutory federal income tax rate		21.00%
Reduction to the provisional tax expense for the Transition Tax	$ 4.7
Increase (decrease) In global tax rate, percent		10.50%
Income tax benefit		$ 15.8
Percentage of uncertain tax positions evaluating criteria		50.00%
Net tax benefits, if recognized, would impact the effective tax rate	$ 5.7	$ 5.7	$ 3.9

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Contingencies (Details) $ in Thousands	9 Months Ended
	Oct. 28, 2018USD ($)
Income Tax Contingency [Line Items]
Beginning balance	$ 16,059
Additions based on tax positions related to the current year	2,145
Ending balance	$ 18,204

Income Taxes - Liability For Un

Income Taxes - Liability For Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Income Tax Contingency [Line Items]
Liability for UTP	$ 18,204	$ 16,059
Non-current deferred tax asset [Member]
Income Tax Contingency [Line Items]
Liability for UTP	12,468	12,135
Other long-term liabilities [Member]
Income Tax Contingency [Line Items]
Liability for UTP	$ 5,736	$ 3,924

Income Taxes - Regional Income

Income Taxes - Regional Income (Loss) From Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Income Tax Disclosure [Abstract]
Domestic	$ (1,647)	$ (2,366)	$ (12,871)	$ (11,396)
Foreign	12,341	19,180	49,746	60,447
Income before taxes and equity in net losses of equity method investments	$ 10,694	$ 16,814	$ 36,875	$ 49,051

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2018	Jan. 28, 2018	Jul. 01, 2017
Commitments and Contingencies [Line Items]
Earn-out liability booked	$ 6,424	$ 26,520
Amount expected to be settled within twelve months	3,632
Cycleo
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate	12,500
Earn-out liability booked	4,263	5,520
Amount expected to be settled within twelve months	2,334
AptoVision Technologies Inc.
Commitments and Contingencies [Line Items]
Earn-out liability booked	2,161	$ 21,000
Amount expected to be settled within twelve months	1,298
Environmental Issue
Commitments and Contingencies [Line Items]
Payment towards remediation plan	2,600
Minimum [Member] | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	5,300
Maximum [Member] | AptoVision Technologies Inc.
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate			$ 47,000
Maximum [Member] | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 7,200

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Earn-out Liability (Details) - USD ($) $ in Thousands	Oct. 28, 2018	Jan. 28, 2018
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	$ 6,424	$ 26,520
Amount expected to be settled within twelve months	3,632
Compensation Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	3,801	4,408
Not Conditional Upon Continued Employment [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	2,623	21,668
Interest Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	0	444
Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	4,263	5,520
Amount expected to be settled within twelve months	2,334
Cycleo | Compensation Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	3,801	4,408
Cycleo | Not Conditional Upon Continued Employment [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	462	668
Cycleo | Interest Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	0	444
AptoVision Technologies Inc.
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	2,161	21,000
Amount expected to be settled within twelve months	1,298
AptoVision Technologies Inc. | Compensation Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	0	0
AptoVision Technologies Inc. | Not Conditional Upon Continued Employment [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	2,161	21,000
AptoVision Technologies Inc. | Interest Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability booked	$ 0	$ 0

Segment Information - Narrative

Segment Information - Narrative (Details)	9 Months Ended	12 Months Ended
	Oct. 28, 2018reportable_segmentoperating_segment	Jan. 28, 2018operating_segment
Segment Reporting Information [Line Items]
Number of operating segments | operating_segment	3	4
Number of reportable segments | reportable_segment	1
Net sales [Member]
Segment Reporting Information [Line Items]
Minimum concentration risk threshold	10.00%

Segment Information - Net Sales

Segment Information - Net Sales Activity by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Revenue from External Customer [Line Items]
Net sales	$ 173,550	$ 150,304	$ 467,190	$ 447,233
Semiconductor Products Group [Member]
Revenue from External Customer [Line Items]
Net sales	$ 173,550	$ 150,304	$ 467,190	$ 447,233

Segment Information - Income by

Segment Information - Income by Segment and Reconciliation to Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Segment Reporting Information [Line Items]
Operating income	$ 41,867	$ 17,579	$ 71,706	$ 54,727
Items to reconcile segment operating income to consolidated income before taxes
Share-based compensation	11,466	15,356	60,947	44,166
Intangible amortization	6,480	7,453	19,921	20,414
Investment impairments, net of offsets	30,000	4,250	30,000	4,250
Changes in the fair value of contingent earn-out obligations	(8,519)	188	(9,419)	188
Interest expense, net	2,355	2,032	6,745	6,107
Non-operating expense, net	(1,182)	(5,517)	(1,914)	(4,681)
Income before taxes and equity in net losses of equity method investments	10,694	16,814	36,875	49,051
Corporate, Non-Segment [Member]
Items to reconcile segment operating income to consolidated income before taxes
Share-based compensation	11,466	15,356	60,947	44,166
Intangible amortization	6,480	7,453	19,921	20,414
Investment impairments, net of offsets	30,000	4,000	30,000	4,000
Changes in the fair value of contingent earn-out obligations	(8,519)	188	(9,419)	188
Litigation cost net of recoveries	(264)	0	(5,476)	0
Other non-segment related expenses	1,708	2,252	2,981	5,221
Amortization of fair value adjustments related to acquired property, plant and equipment	0	0	0	190
Interest expense, net	2,355	2,032	6,745	6,107
Non-operating expense, net	(1,182)	(5,267)	(1,914)	(4,431)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	52,738	42,828	140,660	124,906
Semiconductor Products Group [Member]
Segment Reporting Information [Line Items]
Operating income	$ 52,738	$ 42,828	$ 140,660	$ 124,906

Segment Information - Revenue b

Segment Information - Revenue by Product Line (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Revenue from External Customer [Line Items]
Net sales	$ 173,550,000	$ 150,304,000	$ 467,190,000	$ 447,233,000
Signal Integrity [Member]
Revenue from External Customer [Line Items]
Net sales	69,981,000	63,921,000	204,381,000	198,645,000
Protection [Member]
Revenue from External Customer [Line Items]
Net sales	53,085,000	49,366,000	139,875,000	136,673,000
Wireless and Sensing [Member]
Revenue from External Customer [Line Items]
Net sales	50,484,000	43,266,000	144,435,000	126,641,000
Other: Warrant Shares
Revenue from External Customer [Line Items]
Net sales offset	$ 0	$ (6,249,000)	$ (21,501,000)	$ (14,726,000)
Net sales [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Net sales [Member] | Signal Integrity [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage	40.00%	42.00%	44.00%	43.00%
Net sales [Member] | Protection [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage	31.00%	33.00%	30.00%	31.00%
Net sales [Member] | Wireless and Sensing [Member]
Revenue from External Customer [Line Items]
Concentration risk, percentage	29.00%	29.00%	31.00%	29.00%
Net sales [Member] | Other: Warrant Shares
Revenue from External Customer [Line Items]
Concentration risk, percentage	(0.00%)	(4.00%)	(5.00%)	(3.00%)

Segment Information - Revenue_2

Segment Information - Revenue by Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 173,550	$ 150,304	$ 467,190	$ 447,233
Sales Channel, Through Intermediary
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	120,009	103,463	332,304	298,089
Sales Channel, Directly to Consumer
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	53,541	53,090	156,387	163,870
Other: Warrant Shares
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue offset	$ 0	$ (6,249)	$ (21,501)	$ (14,726)

Segment Information - Net Sal_2

Segment Information - Net Sales Activity by Geographic Region (Details) - Net sales [Member]	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	77.00%	75.00%	74.00%	74.00%
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	16.00%	21.00%	26.00%	21.00%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.00%	8.00%	7.00%	8.00%
Other: Warrant Shares
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	(0.00%)	(4.00%)	(7.00%)	(3.00%)

Segment Information - Summary o

Segment Information - Summary of Sales Activity to Countries that Represented Greater than 10% of Total Net Sales (Details) - Net sales [Member]	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | China Including Hong Kong [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	55.00%	50.00%	54.00%	50.00%
Geographic Concentration Risk [Member] | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.00%	9.00%	11.00%	9.00%

Stock Repurchase Program - Narr

Stock Repurchase Program - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		127 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	May 24, 2018
Equity, Class of Treasury Stock [Line Items]
Additional stock repurchase amount authorized						$ 250,000,000
Shares repurchased under the stock repurchase program, value	$ 30,000,000	$ 0	$ 79,738,000	$ 10,389,000	$ 231,100,000
Remaining authorization under stock repurchase program	$ 217,300,000		$ 217,300,000		$ 217,300,000

Stock Repurchase Program - Summ

Stock Repurchase Program - Summary of Stock Repurchases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		127 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018
Equity, Class of Treasury Stock [Line Items]
Shares repurchased under the stock repurchase program, shares	536,680	0	1,677,433	312,304
Shares repurchased under the stock repurchase program, value	$ 30,000	$ 0	$ 79,738	$ 10,389	$ 231,100
Stock Repurchase Program WIth No Expiration Date [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased under the stock repurchase program, shares	536,680	0	1,677,433	312,304
Shares repurchased under the stock repurchase program, value	$ 30,000	$ 0	$ 79,738	$ 10,389

Restructuring - Activity (Detai

Restructuring - Activity (Details) $ in Thousands	9 Months Ended
	Oct. 28, 2018USD ($)
Restructuring Reserve [Roll Forward]
Balance at January 28, 2018	$ 4,749
Charges	443
Cash payments and adjustments	(4,357)
Balance at October 28, 2018	835
One-time employee termination benefits
Restructuring Reserve [Roll Forward]
Balance at January 28, 2018	4,063
Charges	443
Cash payments and adjustments	(3,914)
Balance at October 28, 2018	592
Contract commitments
Restructuring Reserve [Roll Forward]
Balance at January 28, 2018	686
Charges	0
Cash payments and adjustments	(443)
Balance at October 28, 2018	$ 243

Restructuring - Narrative (Deta

Restructuring - Narrative (Details) $ in Thousands	9 Months Ended
	Oct. 28, 2018USD ($)
Restructuring and Related Activities [Abstract]
Restructuring expense	$ 443

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Narrative (Details) $ in Millions	9 Months Ended
	Oct. 28, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Objectives for using derivative instruments	The Company is exposed to certain risk arising from both its business operations and economic conditions and principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company, on a routine basis and in the normal course of business, experiences expenses denominated in Swiss Franc, Canadian Dollar ("CAD") and Great British Pound ("GBP"). Such expenses expose the Company to exchange rate fluctuations between these foreign currencies and the U.S. Dollar ("USD"). The Company uses derivative financial instruments in the form of forward contracts to mitigate risk associated with adverse movements in these foreign currency exchange rates on a portion of foreign denominated expenses expected to be realized during the current and following fiscal year.
Period over which any gains or losses under foreign exchange contracts are expected to be realized	12 months
Cash flow hedge losses expected to be reclassified into earnings within twelve months	$ 0.1

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Summary of Open Foreign Currency Contracts (Details) £ in Thousands, $ in Thousands, $ in Thousands	Oct. 28, 2018USD ($)	Oct. 28, 2018GBP (£)	Oct. 28, 2018CAD ($)
Derivative [Line Items]
Number of Instruments	14	14	14
Sell USD/Buy CAD Forward Contract [Member]
Derivative [Line Items]
Number of Instruments	3	3	3
Sell USD/Buy GBP Forward Contract [Member]
Derivative [Line Items]
Number of Instruments	11	11	11
Short [Member] | Sell USD/Buy CAD Forward Contract [Member]
Derivative [Line Items]
Notional Value	$ 4,284
Short [Member] | Sell USD/Buy GBP Forward Contract [Member]
Derivative [Line Items]
Notional Value	$ 7,792
Long [Member] | Sell USD/Buy CAD Forward Contract [Member]
Derivative [Line Items]
Notional Value			$ 5,500
Long [Member] | Sell USD/Buy GBP Forward Contract [Member]
Derivative [Line Items]
Notional Value | £		£ 6,000

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Summary of the Carrying Values of Derivative Instruments (Details) - USD ($)		Oct. 28, 2018	Jan. 28, 2018
Derivatives, Fair Value [Line Items]
Fair Value - Assets	[1],[2]	$ 0
Fair Value - (Liabilities)	[1],[2]	(120,000)
Derivative Net Carrying Value		(120,000)
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Net Carrying Value	[1]	(120,000)	$ 0
Level 2 [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value - Assets	[1],[2]	0
Level 2 [Member] | Foreign Exchange Contract [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value - (Liabilities)	[1],[2]	$ (120,000)
[1]	Assets are included in "Other current assets" and liabilities are included in "Accrued liabilities" in the Balance Sheets.
[2]	The fair values of the foreign exchange forward contracts are valued using Level 2 inputs. Please refer to Note 6.

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities - Summary of Gain (Loss) Recognized From Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ 10	$ (193)	$ (148)	$ 1,115
SG&A
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (gain) loss reclassified from AOCI into income (effective portion)	20	(650)	52	(960)
Amount of gain (loss) recognized into income on derivative (ineffective portion and amount excluded from effectiveness testing)	1	(1)	1	(4)
Sell USD/Buy CAD Forward Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	9	(184)	(149)	819
Sell USD/Buy CAD Forward Contract [Member] | SG&A
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (gain) loss reclassified from AOCI into income (effective portion)	41	(442)	73	(532)
Amount of gain (loss) recognized into income on derivative (ineffective portion and amount excluded from effectiveness testing)	1	(1)	1	(4)
Sell USD/Buy GBP Forward Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	1	(9)	1	296
Sell USD/Buy GBP Forward Contract [Member] | SG&A
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (gain) loss reclassified from AOCI into income (effective portion)	(21)	(208)	(21)	(428)
Amount of gain (loss) recognized into income on derivative (ineffective portion and amount excluded from effectiveness testing)	$ 0	$ 0	$ 0	$ 0