Semtech (SMTC) 10-Q 28 Aug 19 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jul. 28, 2019	Aug. 23, 2019
Cover page.
Title of 12(b) Security	Common Stock par value $0.01 per share
Entity Address, Address Line One	200 Flynn Road
Entity Address, City or Town	Camarillo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	93012-8790
City Area Code	805
Local Phone Number	498-2111
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Entity Shell Company	false
Entity Small Business	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-2119684
Contained File Information, File Number	001-06395
Document Type	10-Q
Document Period End Date	Jul. 28, 2019
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Registrant Name	SEMTECH CORP
Entity Central Index Key	0000088941
Current Fiscal Year End Date	--01-26
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		66,530,435
Entity Emerging Growth Company	false
Trading Symbol	SMTC
Security Exchange Name	NASDAQ

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Income Statement [Abstract]
Net sales	$ 137,146	$ 163,211	$ 268,500	$ 293,640
Cost of sales	52,262	63,087	102,341	122,047
Gross profit	84,884	100,124	166,159	171,593
Operating costs and expenses:
Selling, general and administrative	39,875	33,529	78,252	74,935
Product development and engineering	25,553	28,079	52,652	54,278
Intangible amortization	3,908	6,480	9,051	13,441
Changes in the fair value of contingent earn-out obligations	0	(900)	(2,161)	(900)
Total operating costs and expenses	69,336	67,188	137,794	141,754
Operating income	15,548	32,936	28,365	29,839
Interest expense	(2,597)	(2,200)	(5,064)	(4,390)
Non-operating income, net	1,213	542	2,256	732
Income before taxes and equity in net gains (losses) of equity method investments	14,164	31,278	25,557	26,181
Provision (benefit) for income taxes	8,966	6,082	6,654	(11,428)
Net income before equity in net gains (losses) of equity method investments	5,198	25,196	18,903	37,609
Equity in net gains (losses) of equity method investments	168	(27)	(243)	(58)
Net income	$ 5,366	$ 25,169	$ 18,660	$ 37,551
Earnings per share:
Basic (in dollars per share)	$ 0.08	$ 0.38	$ 0.28	$ 0.57
Diluted (in dollars per share)	$ 0.08	$ 0.37	$ 0.28	$ 0.55
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,519	66,063	66,312	66,194
Diluted (in shares)	67,746	68,880	67,814	68,428

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Net income	$ 5,366	$ 25,169	$ 18,660	$ 37,551
Other comprehensive loss, net:
Change in employee benefit plans	69	(16)	137	(32)
Other comprehensive loss, net	(122)	(155)	(134)	(124)
Comprehensive income	5,244	25,014	18,526	37,427
Foreign Exchange Contract [Member]
Other comprehensive loss, net:
Unrealized loss on foreign currency cash flow hedges	(229)	(164)	(280)	(117)
Realized loss on foreign currency cash flow hedges	$ 38	$ 25	$ 9	$ 25

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Current assets:
Cash and cash equivalents	$ 287,839	$ 312,120
Accounts receivable, less allowances of $618 and $774, respectively	58,643	79,223
Inventories	75,060	63,679
Prepaid taxes	15,540	8,406
Other current assets	16,175	21,876
Total current assets	453,257	485,304
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $203,320 and $196,033, respectively	125,764	118,488
Deferred tax assets	17,896	14,362
Goodwill	351,141	351,141
Other intangible assets, net	27,506	36,558
Other assets	80,750	57,028
TOTAL ASSETS	1,056,314	1,062,881
Current liabilities:
Accounts payable	38,903	43,183
Accrued liabilities	49,925	65,023
Deferred revenue	3,455	3,439
Current portion - long-term debt	18,294	18,269
Total current liabilities	110,577	129,914
Non-current liabilities:
Deferred tax liabilities	3,620	3,363
Long term debt, less current portion	183,692	192,845
Other long-term liabilities	68,885	54,078
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.01 par value, 250,000,000 shares authorized, 78,136,144 issued and 66,314,933 outstanding and 78,136,144 issued and 65,238,255 outstanding, respectively	785	785
Treasury stock, at cost, 11,821,211 shares and 12,897,889 shares, respectively	(345,810)	(346,218)
Additional paid-in capital	444,716	456,791
Retained earnings	593,590	574,930
Accumulated other comprehensive loss	(3,741)	(3,607)
Total stockholders’ equity	689,540	682,681
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,056,314	$ 1,062,881

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, receivables	$ 618	$ 774
Accumulated depreciation	$ 203,320	$ 196,033
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	66,314,933	65,238,255
Treasury stock, shares	11,821,211	12,897,889

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment to beginning balance | ASU 2014-09	$ 11,104			$ 11,104
Cumulative-effect adjustment to beginning balance | ASU 2016-16	(1,597)			(1,597)
Beginning balance (in shares) at Jan. 28, 2018		66,280,129
Beginning balance at Jan. 28, 2018	665,013	$ 785	$ 415,056	502,346	$ (251,974)	$ (1,200)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	37,551			37,551
Other comprehensive loss	(124)					(124)
Stock-based compensation	43,649		43,649
Repurchase of outstanding common stock (in shares)		(1,140,753)
Repurchase of outstanding common stock	(49,739)				(49,739)
Treasury stock reissued (in shares)		792,033
Treasury stock reissued	(2,569)		(15,741)		13,172
Ending balance (in shares) at Jul. 29, 2018		65,931,409
Ending balance at Jul. 29, 2018	703,288	$ 785	442,964	549,404	(288,541)	(1,324)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment to beginning balance				(3)
Cumulative-effect adjustment to beginning balance | ASU 2016-16	(3)
Beginning balance (in shares) at Apr. 29, 2018		66,140,592
Beginning balance at Apr. 29, 2018	693,354	$ 785	438,364	524,238	(268,864)	(1,169)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,169			25,169
Other comprehensive loss	(155)					(155)
Stock-based compensation	10,175		10,175
Repurchase of outstanding common stock (in shares)		(495,609)
Repurchase of outstanding common stock	(24,414)				(24,414)
Treasury stock reissued (in shares)		286,426
Treasury stock reissued	(838)		(5,575)		4,737
Ending balance (in shares) at Jul. 29, 2018		65,931,409
Ending balance at Jul. 29, 2018	$ 703,288	$ 785	442,964	549,404	(288,541)	(1,324)
Beginning balance (in shares) at Jan. 27, 2019	65,238,255	65,238,255
Beginning balance at Jan. 27, 2019	$ 682,681	$ 785	456,791	574,930	(346,218)	(3,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,660			18,660
Other comprehensive loss	(134)					(134)
Stock-based compensation	18,890		18,890
Repurchase of outstanding common stock (in shares)		(448,481)
Repurchase of outstanding common stock	(20,110)				(20,110)
Treasury stock reissued (in shares)		1,525,159
Treasury stock reissued	$ (10,447)		(30,965)		20,518
Ending balance (in shares) at Jul. 28, 2019	66,314,933	66,314,933
Ending balance at Jul. 28, 2019	$ 689,540	$ 785	444,716	593,590	(345,810)	(3,741)
Beginning balance (in shares) at Apr. 28, 2019		66,644,921
Beginning balance at Apr. 28, 2019	695,226	$ 785	437,278	588,224	(327,442)	(3,619)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,366			5,366
Other comprehensive loss	(122)					(122)
Stock-based compensation	8,526		8,526
Repurchase of outstanding common stock (in shares)		(446,270)
Repurchase of outstanding common stock	(20,000)				(20,000)
Treasury stock reissued (in shares)		116,282
Treasury stock reissued	$ 544		(1,088)		1,632
Ending balance (in shares) at Jul. 28, 2019	66,314,933	66,314,933
Ending balance at Jul. 28, 2019	$ 689,540	$ 785	$ 444,716	$ 593,590	$ (345,810)	$ (3,741)

Condensed Consolidated Statem_4

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018
Cash flows from operating activities:
Net income	$ 18,660	$ 37,551
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,543	24,540
Accretion of deferred financing costs and debt discount	247	269
Deferred income taxes	3,253	(14,870)
Share-based compensation and warrant costs	19,974	49,481
Loss on disposition of assets	426	11
Earn-out liabilities	(2,161)	(900)
Equity in net losses of equity method investments	243	58
Corporate owned life insurance, net	756	645
Changes in assets and liabilities:
Accounts receivable, net	20,580	(20,653)
Inventories	(11,381)	13,020
Other assets	(6,950)	4,190
Accounts payable	(2,256)	2,626
Accrued liabilities	(18,057)	(6,414)
Deferred revenue	16	(53)
Income taxes payable	(2,105)	(1,697)
Other liabilities	(1,695)	(3,437)
Net cash provided by operating activities	40,093	84,367
Cash flows from investing activities:
Proceeds from sales of property, plant and equipment	143	10
Purchase of property, plant and equipment	(16,893)	(9,821)
Purchase of investments	(7,692)	(5,595)
Acquisition, net of cash acquired	0	(7,321)
Proceeds from sale of investments	0	1,601
Net cash used in investing activities	(24,442)	(21,126)
Cash flows from financing activities:
Payments of term loans	(9,375)	(7,500)
Payment for employee share-based compensation payroll taxes	(13,401)	(10,640)
Proceeds from exercise of stock options	2,954	8,048
Repurchase of outstanding common stock	(20,110)	(49,738)
Net cash used in financing activities	(39,932)	(59,830)
Net (decrease) increase in cash and cash equivalents	(24,281)	3,411
Cash and cash equivalents at beginning of period	312,120	307,923
Cash and cash equivalents at end of period	287,839	311,334
Supplemental disclosure of cash flow information
Income taxes paid	7,580	2,939
Interest paid	4,348	3,900
Non-cash items
Capital expenditures in accounts payable	$ 2,024	$ 2,314

Organization and Basis of Prese

Organization and Basis of Presentation	6 Months Ended
	Jul. 28, 2019
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 local area network ("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 second quarters of fiscal years 2020 and 2019 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 27, 2019 ("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." 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 May 2, 2018, the Company acquired substantially all the assets of IC Interconnect, Inc. (“ICI”) for an aggregate purchase price of approximately $7.4 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 TM platform. $4.9 million was attributed to goodwill (see Note 7 ) 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. 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 was paid approximately $9.0 million to cover damages for claims, costs and attorneys' fees. The Company recorded gains of $6.7 million and $1.3 million in the second and third quarters of fiscal year 2019, respectively, and $1.0 million in the first quarter of fiscal year 2020 for recoveries related to this settlement. All recoveries were presented in "Selling, general and administrative" ("SG&A") in the Statements of Income in the respective periods in which the cash was received. Recent Accounting Standards Adopted In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, Leases (Topic 842), to increase transparency and comparability among organizations by requiring the recognition of right-of-use ("ROU") assets and lease liabilities in the balance sheet. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In July 2018, the FASB issued additional guidance on the accounting for leases. The guidance provides companies with another transition method by allowing entities to recognize a cumulative-effect adjustment to the opening balance of retained earnings as of the date of adoption. Under this method, financial information related to periods prior to adoption will be as originally reported under Accounting Standards Codification ("ASC") 840, Leases. Upon adoption as of January 28, 2019, the Company recorded ROU assets of $13.0 million and lease liabilities of $13.8 million . There was no other impact from the adoption. The difference between the ROU assets and lease liabilities primarily represents the existing deferred rent liabilities balance, resulting from historical straight-lining of operating leases, which was reclassified upon adoption to reduce the measurement of the ROU assets. The adoption of the standard did not have an impact on the Company’s shareholder's equity and did not have a material impact on the Company’s results from operations and cash flows. The new standard provides several optional practical expedients in transition. The Company elected a transition package of three practical expedients permitted within the standard, which eliminates the requirements to reassess prior conclusions about lease identification, lease classification, and initial direct costs. The Company elected the hindsight practical expedient, which permits the use of hindsight when determining lease term and impairment of ROU assets. The Company also made accounting policy elections, including a short-term lease exception policy, permitting it to not apply the recognition requirements of this standard to short-term leases (i.e. leases with terms of 12 months or less), and an accounting policy to account for lease and non-lease components as a single component for equipment leases. In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (AOCI), which gives entities the option to reclassify to retained earnings the tax effects resulting from the Tax Cuts and Jobs Act (“Tax Act”) related to items in AOCI that the FASB refers to as having been stranded in AOCI. The new guidance may be applied retrospectively to each period in which the effect of the Tax Act is recognized in the period of adoption. The Company must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period the Tax Act was enacted. The guidance, when adopted, requires new disclosures regarding a company’s accounting policy for releasing the tax effects in AOCI and provides the Company the option to reclassify to retained earnings the tax effects resulting from the Tax Act that are stranded in AOCI. The Company adopted this guidance in the first quarter of fiscal year 2020. Adoption of this guidance did not have a material impact on the Company's consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815). The new standard is designed to refine and expand hedge accounting for both financial (e.g., interest rate) and commodity risks. Its provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also makes certain targeted improvements to simplify the application of hedge accounting guidance. The new standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption, including adoption in an interim period, is permitted. The Company adopted this guidance in the first quarter of fiscal year 2020. Adoption of this guidance did not have a material impact on the Company's consolidated financial statements.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jul. 28, 2019
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 Six Months Ended (in thousands, except per share amounts) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Net income $ 5,366 $ 25,169 $ 18,660 $ 37,551 Weighted average common shares outstanding - basic 66,519 66,063 66,312 66,194 Dilutive effect of share-based compensation 1,227 2,817 1,502 2,234 Weighted average common shares outstanding - diluted 67,746 68,880 67,814 68,428 Basic earnings per common share $ 0.08 $ 0.38 $ 0.28 $ 0.57 Diluted earnings per common share $ 0.08 $ 0.37 $ 0.28 $ 0.55 Anti-dilutive shares not included in the above calculations 525 202 443 364 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 and the vesting of restricted stock units and performance unit awards if certain conditions have been met, but excludes such incremental shares that would have an anti-dilutive effect.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jul. 28, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share-Based Compensation	Share-Based Compensation Financial Statement Effects and Presentation Pre-tax share-based compensation was included in the Statements of Income as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Revenue offset $ — $ — $ — $ 21,501 Cost of sales 402 306 829 633 Selling, general and administrative 6,082 11,378 14,426 22,840 Product development and engineering 2,162 2,282 4,719 4,507 Total share-based compensation $ 8,646 $ 13,966 $ 19,974 $ 49,481 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 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 ("Acceleration Event"), resulting in the full recognition of the remaining costs to be recognized for the Warrant. For the six-month period ended July 29, 2018, the revenue offset reflects the cost associated with the Warrant of $21.5 million , including $15.9 million related to the Acceleration Event. As of January 27, 2019, the Warrant was fully-vested and exercisable for a total of 869,565 shares, with no additional costs to be recognized in future periods. The Warrant was fully exercised and no longer outstanding as of March 15, 2019. Performance-Based Restricted Stock Units The Company grants performance-based restricted stock units to select employees. These awards have a performance condition in addition to a service condition. 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 2020 , the Company granted 106,000 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 2020 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 2020 for each one, two and three year performance periods was $55.82 , $59.36 and $61.45 , respectively. In the first quarter of fiscal year 2020, the Company granted to the CEO, 160,000 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 TSR benchmarked against the TSR of the S&P SPDR Semiconductor ETF (NYSE:XSD) over a one , two , three and four year period ( one-fourth of the awards vesting each performance period ). The CEO 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 2020 for each one, two, three and four year performance periods was $55.82 , $59.36 , $61.45 and $62.98 , respectively. Market Performance Restricted Stock Units On March 5, 2019, the Company granted its CEO 320,000 restricted stock units with a market performance condition. The award is eligible to vest during the period commencing March 5, 2019, and ending March 5, 2024 (the "Performance Period") as follows: 30% of the restricted stock units covered by the award will vest if, during any consecutive 30 trading day period that commences and ends during the Performance Period, the average per-share closing price of the Company’s common stock equals or exceeds $71.00 ("Tranche 1") and the remaining 70% of the restricted stock units covered by the award will vest if, during any consecutive 30 trading day period that commences and ends during the Performance Period, the average per-share closing price of the Company’s common stock equals or exceeds $95.00 ("Tranche 2"). The award will also vest if a majority change in control of the Company occurs during the Performance Period and, in connection with such event, the Company’s stockholders become entitled to receive per-share consideration equal to or in excess of the per-share performance targets. Specifically, if stockholders become entitled to receive per-share consideration equal to or in excess of $71.00 , then 30% of the award will vest and become nonforfeitable. If the per share consideration is greater than $71.00 , but less than $95.00 , then 30% of the award and a pro-rata percentage of the remaining 70% of the award will vest and become nonforfeitable. If the per share consideration is equal to or greater than $95.00 , the entire award will vest and become nonforfeitable. The grant-date fair value per unit of the awards was determined to be $44.32 and $33.19 for Tranche 1 and Tranche 2, respectively, by application of the Monte Carlo simulation model. The following tables summarize the assumptions used in the Monte Carlo simulation model to determine the fair value of restricted stock units granted in fiscal year 2020 for both Tranche 1 and Tranche 2. Tranche 1 Tranche 2 Expected life, in years 1.0 2.1 Estimated volatility 34.3 % 34.3 % Dividend yield — % — % Risk-free interest rate 2.5 % 2.5 % Weighted-average fair value on grant date $ 44.32 $ 33.19 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	6 Months Ended
	Jul. 28, 2019
Investments [Abstract]
Investments	Investments The following table summarizes the values of the Company’s available-for-sale securities: July 28, 2019 January 27, 2019 (in thousands) Market Value Adjusted Cost Gross Unrealized Gain Market Value Adjusted Cost Gross Unrealized Gain Convertible debt $ 7,922 $ 7,922 $ — $ 3,105 $ 3,105 $ — Total available-for-sale securities $ 7,922 $ 7,922 $ — $ 3,105 $ 3,105 $ — The following table summarizes the maturities of the Company’s available-for-sale securities: July 28, 2019 January 27, 2019 (in thousands) Market Value Adjusted Cost Market Value Adjusted Cost Within 1 year $ 1,013 $ 1,013 $ 3,105 $ 3,105 After 1 year through 5 years 6,909 6,909 — — Total available-for-sale securities $ 7,922 $ 7,922 $ 3,105 $ 3,105 The Company's available-for-sale securities consisted of investments in convertible debt instruments issued by privately-held companies. The available-for-sale securities with maturities within one year were included in "Other current assets" and with maturities greater than one year were included in "Other assets" in the Balance Sheets. The Company's available-for-sale securities during the second quarter of fiscal year 2020 included a $3.2 million convertible note that has a maturity date of December 15, 2020 and an interest rate of 12%

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jul. 28, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following fair value hierarchy is applied for disclosure of the inputs used to measure fair value and prioritizes the inputs into three levels as follows: Level 1 —Quoted prices in active markets for identical assets or liabilities; Level 2 —Observable inputs other than Level 1 prices, such as quoted prices for similar assets and liabilities in active markets or other inputs that are observable for the assets or liabilities, either directly or indirectly; Level 3 —Unobservable inputs based on the Company’s own assumptions, requiring significant management judgment or estimation. 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 Balance Sheets as follows: Fair Value as of July 28, 2019 Fair Value as of January 27, 2019 (in thousands) Total (Level 1) (Level 2) (Level 3) Total (Level 1) (Level 2) (Level 3) Financial assets: Convertible debt $ 7,922 $ — $ — $ 7,922 $ 3,105 $ — $ — $ 3,105 Derivative financial instruments — — — — 69 — 69 — Total financial assets $ 7,922 $ — $ — $ 7,922 $ 3,174 $ — $ 69 $ 3,105 Financial liabilities: AptoVision Earn-out $ — $ — $ — $ — $ 2,161 $ — $ — $ 2,161 Cycleo Earn-out 462 — — 462 462 — — 462 Derivative financial instruments 225 — 225 — — — — — Total financial liabilities $ 687 $ — $ 225 $ 462 $ 2,623 $ — $ — $ 2,623 During the six months ended July 28, 2019 , the Company had no transfers of financial assets or liabilities between Level 1, Level 2 or Level 3. As of July 28, 2019 and January 27, 2019 , 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 currency 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 "Other current assets" in the Balance Sheets and the value of contracts in a loss position are recorded in "Accrued liabilities" in the Balance Sheets. See Note 15 for further discussion of the Company’s derivative instruments. The convertible debt investments are valued utilizing a combination of estimates of the discounted cash flows associated with the debt and the fair value of the equity into which the debt may be converted (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 is 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 is 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 six months ended July 28, 2019 is as follows: (in thousands) AptoVision Cycleo Total Balance at January 27, 2019 $ 2,161 $ 462 $ 2,623 Changes in the fair value of contingent earn-out obligations (2,161 ) — (2,161 ) Balance at July 28, 2019 $ — $ 462 $ 462 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 8 ) was $105.9 million and $115.3 million as of July 28, 2019 and January 27, 2019 , respectively. The fair value of the Company's Revolving Loans (as defined in Note 8 ) was $97.0 million as of both July 28, 2019 and January 27, 2019 . These fair values are based on Level 2 inputs as they were derived from quoted rates from banks for transactions with similar amounts, maturities, credit ratings and payment terms, which determined that the carrying amounts of the Company's Term Loans and Revolving Loans approximate fair value. 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 the Company's investments in non-marketable equity interests, the Company has not identified events or changes in circumstances that may have a significant adverse effect on the fair value of its equity investments during the first six months of fiscal year 2020

Inventories

Inventories	6 Months Ended
	Jul. 28, 2019
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 consisted of the following: (in thousands) July 28, 2019 January 27, 2019 Raw materials $ 2,271 $ 2,057 Work in progress 52,863 44,530 Finished goods 19,926 17,092 Inventories $ 75,060 $ 63,679

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jul. 28, 2019
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 27, 2019 $ 274,085 $ 72,128 $ 4,928 $ 351,141 Additions — — — — Balance at July 28, 2019 $ 274,085 $ 72,128 $ 4,928 $ 351,141 (in thousands) Signal Integrity Wireless and Sensing Protection Total Balance at January 28, 2018 $ 274,085 $ 67,812 $ — $ 341,897 Additions — — 4,834 4,834 Balance at July 29, 2018 $ 274,085 $ 67,812 $ 4,834 $ 346,731 The reporting units are the same as the operating segments, which are part of a single reportable segment (see Note 13 ). Goodwill is tested for impairment at the reporting unit level during the fourth quarter of each fiscal year. In addition to its annual review, the Company performs a test of impairment when indicators of impairment are present. As of July 28, 2019 , there was no indication of impairment of the Company's goodwill balances. Purchased Intangibles The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which continue to be amortized: July 28, 2019 January 27, 2019 (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 $ 88,088 $ (64,337 ) $ 23,751 $ 167,930 $ (136,544 ) $ 31,386 Customer relationships 3-10 years 6,001 (4,546 ) 1,455 34,031 (31,159 ) 2,872 Total finite-lived intangible assets $ 94,089 $ (68,883 ) $ 25,206 $ 201,961 $ (167,703 ) $ 34,258 Amortization expense of finite-lived intangible assets recorded in the Statements of Income for each period was as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Core technologies $ 3,475 $ 5,047 $ 7,634 $ 10,575 Customer relationships 433 1,433 1,417 2,866 Total amortization expense $ 3,908 $ 6,480 $ 9,051 $ 13,441 Future amortization expense of finite-lived intangible assets is expected as follows: (in thousands) Fiscal Year Ending: Core Technologies Customer Relationships Total 2020 (remaining six months) $ 6,604 $ 866 $ 7,470 2021 7,389 589 7,978 2022 4,655 — 4,655 2023 3,714 — 3,714 2024 1,389 — 1,389 Thereafter — — — Total expected amortization expense $ 23,751 $ 1,455 $ 25,206 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 27, 2019 $ 2,300 In-process research and development through acquisitions — Value at July 28, 2019 $ 2,300 Indefinite-lived intangible assets are tested for impairment annually on the first day of the fourth quarter or more frequently if events or changes in circumstances (each, a “triggering event”) would more likely than not reduce the carrying value of the asset below its fair value, calculated as the future discounted cash flows that asset is expected to generate. Management did not identify any triggering events during the six months ended July 28, 2019 , that would require an interim impairment analysis.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jul. 28, 2019
Debt Instruments [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt and the current period interest rates were as follows: Balance as of (in thousands) July 28, 2019 January 27, 2019 Term loans $ 105,938 $ 115,312 Revolving loans 97,000 97,000 Total debt 202,938 212,312 Current portion, net (18,294 ) (18,269 ) Total long-term debt 184,644 194,043 Debt issuance costs (952 ) (1,198 ) Total long-term debt, net of debt issuance costs $ 183,692 $ 192,845 Weighted-average interest rate 3.90 % 4.14 % 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 July 28, 2019 , the Company was 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: 2020 (remaining six months) $ 9,375 2021 19,688 2022 76,875 Total Term Loans $ 105,938 There are no scheduled principal payments for the Revolving Loans, which had outstanding borrowings of $97.0 million at July 28, 2019 , and are due on or before November 12, 2021. As of July 28, 2019 , the Company had $153.0 million of unused borrowing capacity under the Revolving Loans. Interest expense was comprised of the following components for the periods presented: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Contractual interest $ 2,475 $ 2,067 $ 4,817 $ 4,121 Amortization of debt discount 86 94 174 190 Amortization of debt issuance costs 36 39 73 79 Total interest expense $ 2,597 $ 2,200 $ 5,064 $ 4,390 As of July 28, 2019 , there were no amounts outstanding under the letters of credit, swing line loans and alternative currency sub-facilities.

Income Taxes

Income Taxes	6 Months Ended
	Jul. 28, 2019
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 the regional mix of income and the impact of finalized regulations on the U.S. transition tax. 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 27, 2019 $ 18,293 Additions/(decreases) based on tax positions related to the current fiscal year 6,614 Balance at July 28, 2019 $ 24,907 Included in the balance of gross unrecognized tax benefits at July 28, 2019 and January 27, 2019 are $11.0 million and $4.5 million , respectively, of net tax benefits (after the 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) July 28, 2019 January 27, 2019 Deferred tax assets - non-current $ 12,569 $ 12,492 Other long-term liabilities 11,010 4,479 Total accrued taxes $ 23,579 $ 16,971 The Company’s policy is to include net interest and penalties related to unrecognized tax benefits in 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 2018. 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 (loss) from continuing operations before taxes and equity in net losses of equity method investments was as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Domestic $ (6,426 ) $ (3,524 ) $ (14,894 ) $ (11,224 ) Foreign 20,590 34,802 40,451 37,405 Total $ 14,164 $ 31,278 $ 25,557 $ 26,181

Leases (Notes)

Leases (Notes)	6 Months Ended
	Jul. 28, 2019
Leases [Abstract]
Leases	Leases The Company has operating leases for real estate, vehicles, and office equipment. Real estate leases are used to secure office space for the Company's administrative, engineering, production support and manufacturing activities. The Company's leases have remaining lease terms of 1 to 7 years, some of which include options to extend the leases for up to 5 years, and some of which include options to terminate the leases within 1 year. The components of lease expense for the three and six months ended July 28, 2019 were as follows: (in thousands) Three Months Ended Six Months Ended Operating lease cost $ 1,214 2,428 Short-term lease cost 83 161 Sublease income (32 ) (65 ) Total lease cost $ 1,265 $ 2,524 Supplemental cash flow information for the six months ended July 28, 2019 related to leases was as follows: (in thousands) Cash paid for amounts included in the measurement of lease liabilities $ 2,560 Right-of-use assets obtained in exchange for new operating lease liabilities $ 25 Weighted-average remaining lease term - operating leases 4 years Weighted-average discount rate - operating leases 6.7 % Supplemental balance sheet information as of July 28, 2019 related to leases was as follows: (in thousands) Operating lease right-of-use assets (1) (2) $ 10,919 Other current liabilities (1) $ 4,011 Operating lease liabilities (1) 7,672 Total operating lease liabilities $ 11,683 (1) Operating lease right-of-use assets are included in "Other assets", other current liabilities are included in "Accrued liabilities" and operating lease liabilities are included in "Other long-term liabilities" in the Balance Sheets. (2) The difference between the ROU assets and lease liabilities primarily represents the existing deferred rent liabilities balance, resulting from historical straight-lining of operating leases, which was effectively reclassified upon adoption to reduce the measurement of the ROU assets. Maturities of lease liabilities as of July 28, 2019 are as follows: (in thousands) Fiscal Year Ending: 2020 (remaining six months) $ 2,531 2021 3,864 2022 2,492 2023 1,461 2024 1,191 2025 1,022 Thereafter 874 Total lease payments 13,435 Less: imputed interest (1,752 ) Total $ 11,683 As of July 28, 2019 , the Company has an additional operating lease, primarily for office space, that it has yet to occupy for a value of approximately $3.2 million . The operating lease will commence at the end of fiscal year 2020 with a lease term of 7 years .

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 28, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Commitments and Contingencies In accordance with ASC 450-20, 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 has been complying with RWQCB orders and direction, and has implemented an approved remedial action plan addressing the 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 estimates the range of probable loss between $5.9 million and $7.5 million . To date, the Company has made $3.7 million in payments towards the remedial action plan and, as of July 28, 2019 , has a remaining accrual of $2.2 million related to this matter. 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 and the related accrual has been immaterial to the Company’s consolidated financial statements. Deferred Compensation The Company maintains a deferred compensation plan for certain officers and key executives that allow participants to defer a portion of their compensation for future distribution at various times permitted by the plan. This plan provides for a discretionary Company match up to a defined portion of the employee's deferral, with any match subject to a vesting period. The Company's liability for the deferred compensation plan is presented below: (in thousands) July 28, 2019 January 27, 2019 Accrued liabilities $ 1,403 $ 2,203 Other long-term liabilities 30,953 27,251 Total deferred compensation liabilities under this plan $ 32,356 $ 29,454 The Company has purchased whole life insurance on the lives of certain current deferred compensation plan participants. This Company-owned life insurance is held in a grantor trust and is intended to cover a majority of the Company's costs of the deferred compensation plan. The cash surrender value of the Company-owned life insurance was $22.7 million and $20.4 million as of July 28, 2019 and January 27, 2019 , respectively, and is included in "Other assets" in the Balance Sheets. 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 July 28, 2019 , the Company potentially may make payments totaling up to approximately $11.3 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 $4.8 million and $4.5 million as of July 28, 2019 and January 27, 2019 , 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 July 28, 2019 , the Company potentially may make payments totaling up to approximately $35.3 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. The Company fully released its liability for the AptoVision Earn-out during the six months ended July 28, 2019 based on the Company's assessment of performance. A summary of earn-out liabilities, included in "Accrued liabilities" and "Other long-term liabilities" in the Balance Sheets, by classification follows: Balance at July 28, 2019 Balance at January 27, 2019 (in thousands) Cycleo AptoVision Total Cycleo AptoVision Total Compensation expense $ 4,367 $ — $ 4,367 $ 4,052 $ — $ 4,052 Not conditional upon continued employment 462 — 462 462 2,161 2,623 Total liability $ 4,829 $ — $ 4,829 $ 4,514 $ 2,161 $ 6,675 Amount expected to be settled within twelve months $ 4,829 $ — $ 4,829 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 re-aligned resources and infrastructure predominantly related to its wireless charging business, which resulted in restructuring expense of $2.0 million and $2.1 million in the three and six months ended July 28, 2019 , respectively, which was included in "Selling, general and administrative" within the Statements of Income. The Company does not expect a material amount of expenses related to this restructuring in future periods.

Concentration of Risk

Concentration of Risk	6 Months Ended
	Jul. 28, 2019
Risks and Uncertainties [Abstract]
Concentration of Risk	Concentration of Risk The following significant customers accounted for at least 10% of net sales in one or more of the periods indicated: Three Months Ended Six Months Ended (percentage of net sales) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Trend-tek Technology Ltd (and affiliates) 14 % 13 % 13 % 13 % Frontek Technology Corporation (and affiliates) 10 % 13 % 10 % 10 % Arrow Electronics (and affiliates) 9 % 10 % 9 % 11 % Huawei Technologies Co., Ltd. (and affiliates) 5 % 9 % 10 % 7 % Samsung Electronics (and affiliates) 3 % 7 % 6 % 7 % Premier Technical Sales Korea, Inc. (and affiliates) (1) 8 % 4 % 7 % 5 % (1) Premier is a distributor with a concentration of sales to Samsung. The above percentages represent the Company's estimate of the sales activity related to Samsung that is passing through this distributor. The following table shows the customers that have an outstanding receivable balance that represents at least 10% of total net receivables as of the dates indicated: Balance as of (percentage of net sales) July 28, 2019 January 27, 2019 Frontek Technology Corporation (and affiliates) 12 % 10 % Trend-tek Technology Ltd (and affiliates) 12 % 11 % Outside Subcontractors and Suppliers The Company relies on a limited number of third-party subcontractors and suppliers for the production of silicon wafers, packaging and certain other tasks. Disruption or termination of supply sources or subcontractors, including due to natural disasters such as an earthquake or other causes, could delay shipments and could have a material adverse effect on the Company. Although there are generally alternate sources for these materials and services, qualification of the alternate sources could cause delays sufficient to have a material adverse effect on the Company. Several of the Company’s third-party subcontractors and suppliers, including third-party foundries that supply silicon wafers, are located in foreign countries, including China, Israel and Taiwan. A significant amount of the Company’s assembly and test operations are conducted by third-party contractors in China, Malaysia, Taiwan, Thailand, South Korea and the Philippines. During the three and six months ended July 28, 2019 , approximately 23% and 20% , respectively, of the Company’s silicon in terms of cost of wafers was supplied by a third-party foundry in China, and approximately 14% and 13% , respectively, of the Company’s silicon in terms of cost of wafers was supplied by a third-party foundry in Israel. During the three and six months ended July 29, 2018 , approximately 15% and 15% , respectively, of the Company’s silicon in terms of cost of wafers was supplied by a third-party foundry in China, and approximately 16% and 12% , respectively, of the Company’s silicon in terms of cost of wafers was supplied by a third-party foundry in Israel. These percentages could be higher in future periods. For the three and six months ended July 28, 2019 , authorized distributors accounted for approximately 72% and 67% , respectively, of the Company’s net sales, compared to approximately 67% for both the three and six months ended July 29, 2018 . Generally, the Company does not have long-term contracts with its distributors and most can terminate th eir agreement with little or no notice. For the second quarter of fiscal year 2020

Segment Information

Segment Information	6 Months Ended
	Jul. 28, 2019
Segment Reporting [Abstract]
Segment Information	Segment Information The Company’s CEO functions as the chief operating decision maker ("CODM"). The CODM makes operating decisions and assesses performance based on the Company's major product lines, which represent its operating segments. The Company has three operating segments—Protection, Signal Integrity, and Wireless and Sensing—that have similar economic characteristics and have been aggregated into one reportable segment identified as the "Semiconductor Products Group." The Company’s assets are commingled among the various operating segments and the CODM does not use asset information in making operating decisions or assessing performance. Therefore, the Company has not included asset information by segment in the segment disclosures below. Net sales by segment were as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Semiconductor Products Group $ 137,146 $ 163,211 $ 268,500 $ 293,640 Total $ 137,146 $ 163,211 $ 268,500 $ 293,640 The following table presents a reconciliation of operating income by segment to consolidated income before taxes. Historical amounts have been adjusted to conform to the current presentation: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Semiconductor Products Group $ 31,505 $ 47,110 $ 60,133 $ 87,922 Operating income by segment 31,505 47,110 60,133 87,922 Items to reconcile segment operating income to consolidated income before taxes: Share-based compensation 8,646 13,966 19,974 49,481 Intangible amortization 3,908 6,480 9,051 13,441 Changes in the fair value of contingent earn-out obligations — (900 ) (2,161 ) (900 ) Restructuring and other reserves 2,571 85 2,711 431 Litigation cost, net of recoveries 799 (5,857 ) 725 (5,297 ) Transaction and integration related 33 400 1,468 927 Interest expense 2,597 2,200 5,064 4,390 Non-operating expense, net (1,213 ) (542 ) (2,256 ) (732 ) Income before taxes $ 14,164 $ 31,278 $ 25,557 $ 26,181 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 Six Months Ended (in thousands, except percentages) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Signal Integrity $ 55,094 40 % $ 68,802 42 % $ 105,350 39 % $ 134,401 45 % Wireless and Sensing 41,696 30 % 48,410 30 % 83,903 31 % 93,949 32 % Protection 40,356 30 % 45,999 28 % 79,247 30 % 86,791 30 % Other: Warrant Shares (1) — — % — — % — — % (21,501 ) (7 )% Total net sales $ 137,146 100 % $ 163,211 100 % $ 268,500 100 % $ 293,640 100 % (1) For the six-month period ended July 29, 2018, the revenue offset reflects the cost associated with the Warrant of $21.5 million , including $15.9 million related to the Acceleration Event (see Note 3 for discussion regarding Share-Based Compensation). Information by Sales Channel Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Distributor $ 99,138 $ 109,844 $ 180,280 $ 212,317 Direct 38,008 53,367 88,220 102,824 Other: Warrant Shares — — — (21,501 ) Total net sales $ 137,146 $ 163,211 $ 268,500 $ 293,640 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 was as follows: Three Months Ended Six Months Ended July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Asia-Pacific 74 % 75 % 76 % 72 % North America 16 % 19 % 14 % 28 % Europe 10 % 6 % 10 % 7 % Other: Warrant Shares — % — % — % (7 )% 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 Six Months Ended (percentage of total sales) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 China (including Hong Kong) 52 % 56 % 52 % 53 % United States 9 % 10 % 10 % 12 %

Stock Repurchase Program

Stock Repurchase Program	6 Months Ended
	Jul. 28, 2019
Equity [Abstract]
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 Six Months Ended July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 (in thousands, except number of shares) Shares Price Paid Shares Price Paid Shares Price Paid Shares Price Paid Shares repurchased under the stock repurchase program 446,270 $ 20,000 495,609 $ 24,413 448,481 $ 20,110 1,140,753 $ 49,738 On May 24, 2018, the Company's Board of Directors authorized the expansion of the stock repurchase program by $250.0 million . As of July 28, 2019 , the Company had repurchased $287.7 million in shares of its common stock under the program since inception and the remaining authorization under the program was $160.7 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.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	6 Months Ended
	Jul. 28, 2019
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 occasionally uses derivative financial instruments, in the form of forward contracts, to mitigate a portion of the risk associated with adverse movements in these foreign currency exchange rates during a twelve month window. 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 July 28, 2019 , the Company did not have a material amount of outstanding foreign exchange contracts. For the first six months of fiscal years 2020 and 2019 , the impact of the foreign exchange contracts was not material.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policy)	6 Months Ended
	Jul. 28, 2019
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 second quarters of fiscal years 2020 and 2019 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 27, 2019 ("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."
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 February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, Leases (Topic 842), to increase transparency and comparability among organizations by requiring the recognition of right-of-use ("ROU") assets and lease liabilities in the balance sheet. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In July 2018, the FASB issued additional guidance on the accounting for leases. The guidance provides companies with another transition method by allowing entities to recognize a cumulative-effect adjustment to the opening balance of retained earnings as of the date of adoption. Under this method, financial information related to periods prior to adoption will be as originally reported under Accounting Standards Codification ("ASC") 840, Leases. Upon adoption as of January 28, 2019, the Company recorded ROU assets of $13.0 million and lease liabilities of $13.8 million . There was no other impact from the adoption. The difference between the ROU assets and lease liabilities primarily represents the existing deferred rent liabilities balance, resulting from historical straight-lining of operating leases, which was reclassified upon adoption to reduce the measurement of the ROU assets. The adoption of the standard did not have an impact on the Company’s shareholder's equity and did not have a material impact on the Company’s results from operations and cash flows. The new standard provides several optional practical expedients in transition. The Company elected a transition package of three practical expedients permitted within the standard, which eliminates the requirements to reassess prior conclusions about lease identification, lease classification, and initial direct costs. The Company elected the hindsight practical expedient, which permits the use of hindsight when determining lease term and impairment of ROU assets. The Company also made accounting policy elections, including a short-term lease exception policy, permitting it to not apply the recognition requirements of this standard to short-term leases (i.e. leases with terms of 12 months or less), and an accounting policy to account for lease and non-lease components as a single component for equipment leases. In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (AOCI), which gives entities the option to reclassify to retained earnings the tax effects resulting from the Tax Cuts and Jobs Act (“Tax Act”) related to items in AOCI that the FASB refers to as having been stranded in AOCI. The new guidance may be applied retrospectively to each period in which the effect of the Tax Act is recognized in the period of adoption. The Company must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period the Tax Act was enacted. The guidance, when adopted, requires new disclosures regarding a company’s accounting policy for releasing the tax effects in AOCI and provides the Company the option to reclassify to retained earnings the tax effects resulting from the Tax Act that are stranded in AOCI. The Company adopted this guidance in the first quarter of fiscal year 2020. Adoption of this guidance did not have a material impact on the Company's consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815). The new standard is designed to refine and expand hedge accounting for both financial (e.g., interest rate) and commodity risks. Its provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also makes certain targeted improvements to simplify the application of hedge accounting guidance. The new standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption, including adoption in an interim period, is permitted. The Company adopted this guidance in the first quarter of fiscal year 2020. Adoption of this guidance did not have a material impact on the Company's consolidated financial statements.
Earnings Per Share	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 and the vesting of restricted stock units and performance unit awards if certain conditions have been met, but
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 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. These awards have a performance condition in addition to a service condition. 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.
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 in the "Provision for taxes" in the Statements of Income.
Commitments and Contingencies	In accordance with ASC 450-20, 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 and the related accrual 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.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jul. 28, 2019
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 Six Months Ended (in thousands, except per share amounts) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Net income $ 5,366 $ 25,169 $ 18,660 $ 37,551 Weighted average common shares outstanding - basic 66,519 66,063 66,312 66,194 Dilutive effect of share-based compensation 1,227 2,817 1,502 2,234 Weighted average common shares outstanding - diluted 67,746 68,880 67,814 68,428 Basic earnings per common share $ 0.08 $ 0.38 $ 0.28 $ 0.57 Diluted earnings per common share $ 0.08 $ 0.37 $ 0.28 $ 0.55 Anti-dilutive shares not included in the above calculations 525 202 443 364

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jul. 28, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Allocation Of Stock-Based Compensation	Pre-tax share-based compensation was included in the Statements of Income as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Revenue offset $ — $ — $ — $ 21,501 Cost of sales 402 306 829 633 Selling, general and administrative 6,082 11,378 14,426 22,840 Product development and engineering 2,162 2,282 4,719 4,507 Total share-based compensation $ 8,646 $ 13,966 $ 19,974 $ 49,481
Schedule of Share-based Compensation, Restricted Stock Units	The following tables summarize the assumptions used in the Monte Carlo simulation model to determine the fair value of restricted stock units granted in fiscal year 2020 for both Tranche 1 and Tranche 2. Tranche 1 Tranche 2 Expected life, in years 1.0 2.1 Estimated volatility 34.3 % 34.3 % Dividend yield — % — % Risk-free interest rate 2.5 % 2.5 % Weighted-average fair value on grant date $ 44.32 $ 33.19

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jul. 28, 2019
Investments [Abstract]
Summary Of Investments	The following table summarizes the values of the Company’s available-for-sale securities: July 28, 2019 January 27, 2019 (in thousands) Market Value Adjusted Cost Gross Unrealized Gain Market Value Adjusted Cost Gross Unrealized Gain Convertible debt $ 7,922 $ 7,922 $ — $ 3,105 $ 3,105 $ — Total available-for-sale securities $ 7,922 $ 7,922 $ — $ 3,105 $ 3,105 $ —
Schedule Of Investments, Classified By Maturity Period	The following table summarizes the maturities of the Company’s available-for-sale securities: July 28, 2019 January 27, 2019 (in thousands) Market Value Adjusted Cost Market Value Adjusted Cost Within 1 year $ 1,013 $ 1,013 $ 3,105 $ 3,105 After 1 year through 5 years 6,909 6,909 — — Total available-for-sale securities $ 7,922 $ 7,922 $ 3,105 $ 3,105

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 28, 2019
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 Balance Sheets as follows: Fair Value as of July 28, 2019 Fair Value as of January 27, 2019 (in thousands) Total (Level 1) (Level 2) (Level 3) Total (Level 1) (Level 2) (Level 3) Financial assets: Convertible debt $ 7,922 $ — $ — $ 7,922 $ 3,105 $ — $ — $ 3,105 Derivative financial instruments — — — — 69 — 69 — Total financial assets $ 7,922 $ — $ — $ 7,922 $ 3,174 $ — $ 69 $ 3,105 Financial liabilities: AptoVision Earn-out $ — $ — $ — $ — $ 2,161 $ — $ — $ 2,161 Cycleo Earn-out 462 — — 462 462 — — 462 Derivative financial instruments 225 — 225 — — — — — Total financial liabilities $ 687 $ — $ 225 $ 462 $ 2,623 $ — $ — $ 2,623
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	A reconciliation of the change in the earn-out liability during the six months ended July 28, 2019 is as follows: (in thousands) AptoVision Cycleo Total Balance at January 27, 2019 $ 2,161 $ 462 $ 2,623 Changes in the fair value of contingent earn-out obligations (2,161 ) — (2,161 ) Balance at July 28, 2019 $ — $ 462 $ 462

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jul. 28, 2019
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 consisted of the following: (in thousands) July 28, 2019 January 27, 2019 Raw materials $ 2,271 $ 2,057 Work in progress 52,863 44,530 Finished goods 19,926 17,092 Inventories $ 75,060 $ 63,679

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jul. 28, 2019
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 27, 2019 $ 274,085 $ 72,128 $ 4,928 $ 351,141 Additions — — — — Balance at July 28, 2019 $ 274,085 $ 72,128 $ 4,928 $ 351,141 (in thousands) Signal Integrity Wireless and Sensing Protection Total Balance at January 28, 2018 $ 274,085 $ 67,812 $ — $ 341,897 Additions — — 4,834 4,834 Balance at July 29, 2018 $ 274,085 $ 67,812 $ 4,834 $ 346,731
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: July 28, 2019 January 27, 2019 (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 $ 88,088 $ (64,337 ) $ 23,751 $ 167,930 $ (136,544 ) $ 31,386 Customer relationships 3-10 years 6,001 (4,546 ) 1,455 34,031 (31,159 ) 2,872 Total finite-lived intangible assets $ 94,089 $ (68,883 ) $ 25,206 $ 201,961 $ (167,703 ) $ 34,258 Amortization expense of finite-lived intangible assets recorded in the Statements of Income for each period was as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Core technologies $ 3,475 $ 5,047 $ 7,634 $ 10,575 Customer relationships 433 1,433 1,417 2,866 Total amortization expense $ 3,908 $ 6,480 $ 9,051 $ 13,441
Schedule of Future Amortization of Intangible Asset	Future amortization expense of finite-lived intangible assets is expected as follows: (in thousands) Fiscal Year Ending: Core Technologies Customer Relationships Total 2020 (remaining six months) $ 6,604 $ 866 $ 7,470 2021 7,389 589 7,978 2022 4,655 — 4,655 2023 3,714 — 3,714 2024 1,389 — 1,389 Thereafter — — — Total expected amortization expense $ 23,751 $ 1,455 $ 25,206
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 27, 2019 $ 2,300 In-process research and development through acquisitions — Value at July 28, 2019 $ 2,300

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jul. 28, 2019
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) July 28, 2019 January 27, 2019 Term loans $ 105,938 $ 115,312 Revolving loans 97,000 97,000 Total debt 202,938 212,312 Current portion, net (18,294 ) (18,269 ) Total long-term debt 184,644 194,043 Debt issuance costs (952 ) (1,198 ) Total long-term debt, net of debt issuance costs $ 183,692 $ 192,845 Weighted-average interest rate 3.90 % 4.14 %
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: 2020 (remaining six months) $ 9,375 2021 19,688 2022 76,875 Total Term Loans $ 105,938
Schedule Of Interest Expense	Interest expense was comprised of the following components for the periods presented: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Contractual interest $ 2,475 $ 2,067 $ 4,817 $ 4,121 Amortization of debt discount 86 94 174 190 Amortization of debt issuance costs 36 39 73 79 Total interest expense $ 2,597 $ 2,200 $ 5,064 $ 4,390

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jul. 28, 2019
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 27, 2019 $ 18,293 Additions/(decreases) based on tax positions related to the current fiscal year 6,614 Balance at July 28, 2019 $ 24,907
Liability For Uncertain Tax Positions	The liability for UTP is reflected in the Balance Sheets as follows: (in thousands) July 28, 2019 January 27, 2019 Deferred tax assets - non-current $ 12,569 $ 12,492 Other long-term liabilities 11,010 4,479 Total accrued taxes $ 23,579 $ 16,971
Regional Income (Loss) From Continuing Operations Before Income Taxes	The Company’s regional income (loss) from continuing operations before taxes and equity in net losses of equity method investments was as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Domestic $ (6,426 ) $ (3,524 ) $ (14,894 ) $ (11,224 ) Foreign 20,590 34,802 40,451 37,405 Total $ 14,164 $ 31,278 $ 25,557 $ 26,181

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jul. 28, 2019
Leases [Abstract]
Lease, Cost	The components of lease expense for the three and six months ended July 28, 2019 were as follows: (in thousands) Three Months Ended Six Months Ended Operating lease cost $ 1,214 2,428 Short-term lease cost 83 161 Sublease income (32 ) (65 ) Total lease cost $ 1,265 $ 2,524 Supplemental cash flow information for the six months ended July 28, 2019 related to leases was as follows: (in thousands) Cash paid for amounts included in the measurement of lease liabilities $ 2,560 Right-of-use assets obtained in exchange for new operating lease liabilities $ 25 Weighted-average remaining lease term - operating leases 4 years Weighted-average discount rate - operating leases 6.7 %
Assets And Liabilities, Lessee	Supplemental balance sheet information as of July 28, 2019 related to leases was as follows: (in thousands) Operating lease right-of-use assets (1) (2) $ 10,919 Other current liabilities (1) $ 4,011 Operating lease liabilities (1) 7,672 Total operating lease liabilities $ 11,683 (1) Operating lease right-of-use assets are included in "Other assets", other current liabilities are included in "Accrued liabilities" and operating lease liabilities are included in "Other long-term liabilities" in the Balance Sheets. (2) The difference between the ROU assets and lease liabilities primarily represents the existing deferred rent liabilities balance, resulting from historical straight-lining of operating leases, which was effectively reclassified upon adoption to reduce the measurement of the ROU assets.
Lessee, Operating Lease, Liability, Maturity	Maturities of lease liabilities as of July 28, 2019 are as follows: (in thousands) Fiscal Year Ending: 2020 (remaining six months) $ 2,531 2021 3,864 2022 2,492 2023 1,461 2024 1,191 2025 1,022 Thereafter 874 Total lease payments 13,435 Less: imputed interest (1,752 ) Total $ 11,683

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 28, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Liability for Deferred Compensation	The Company's liability for the deferred compensation plan is presented below: (in thousands) July 28, 2019 January 27, 2019 Accrued liabilities $ 1,403 $ 2,203 Other long-term liabilities 30,953 27,251 Total deferred compensation liabilities under this plan $ 32,356 $ 29,454
Summary of Earn-out Liabilities by Classification	A summary of earn-out liabilities, included in "Accrued liabilities" and "Other long-term liabilities" in the Balance Sheets, by classification follows: Balance at July 28, 2019 Balance at January 27, 2019 (in thousands) Cycleo AptoVision Total Cycleo AptoVision Total Compensation expense $ 4,367 $ — $ 4,367 $ 4,052 $ — $ 4,052 Not conditional upon continued employment 462 — 462 462 2,161 2,623 Total liability $ 4,829 $ — $ 4,829 $ 4,514 $ 2,161 $ 6,675 Amount expected to be settled within twelve months $ 4,829 $ — $ 4,829

Concentration of Risk (Tables)

Concentration of Risk (Tables)	6 Months Ended
	Jul. 28, 2019
Risks and Uncertainties [Abstract]
Schedule Of Significant Customers Accounting For At Least 10% Of Net Sales	The following significant customers accounted for at least 10% of net sales in one or more of the periods indicated: Three Months Ended Six Months Ended (percentage of net sales) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Trend-tek Technology Ltd (and affiliates) 14 % 13 % 13 % 13 % Frontek Technology Corporation (and affiliates) 10 % 13 % 10 % 10 % Arrow Electronics (and affiliates) 9 % 10 % 9 % 11 % Huawei Technologies Co., Ltd. (and affiliates) 5 % 9 % 10 % 7 % Samsung Electronics (and affiliates) 3 % 7 % 6 % 7 % Premier Technical Sales Korea, Inc. (and affiliates) (1) 8 % 4 % 7 % 5 % (1) Premier is a distributor with a concentration of sales to Samsung. The above percentages represent the Company's estimate of the sales activity related to Samsung that is passing through this distributor. The following table shows the customers that have an outstanding receivable balance that represents at least 10% of total net receivables as of the dates indicated: Balance as of (percentage of net sales) July 28, 2019 January 27, 2019 Frontek Technology Corporation (and affiliates) 12 % 10 % Trend-tek Technology Ltd (and affiliates) 12 % 11 %

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jul. 28, 2019
Segment Reporting [Abstract]
Net Sales by Segment	Net sales by segment were as follows: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Semiconductor Products Group $ 137,146 $ 163,211 $ 268,500 $ 293,640 Total $ 137,146 $ 163,211 $ 268,500 $ 293,640
Income by Segment and Reconciliation to Consolidated Operating Income	The following table presents a reconciliation of operating income by segment to consolidated income before taxes. Historical amounts have been adjusted to conform to the current presentation: Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Semiconductor Products Group $ 31,505 $ 47,110 $ 60,133 $ 87,922 Operating income by segment 31,505 47,110 60,133 87,922 Items to reconcile segment operating income to consolidated income before taxes: Share-based compensation 8,646 13,966 19,974 49,481 Intangible amortization 3,908 6,480 9,051 13,441 Changes in the fair value of contingent earn-out obligations — (900 ) (2,161 ) (900 ) Restructuring and other reserves 2,571 85 2,711 431 Litigation cost, net of recoveries 799 (5,857 ) 725 (5,297 ) Transaction and integration related 33 400 1,468 927 Interest expense 2,597 2,200 5,064 4,390 Non-operating expense, net (1,213 ) (542 ) (2,256 ) (732 ) Income before taxes $ 14,164 $ 31,278 $ 25,557 $ 26,181
Net Sales Activity By Product Line	The table below provides net sales activity by product line on a comparative basis: Three Months Ended Six Months Ended (in thousands, except percentages) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Signal Integrity $ 55,094 40 % $ 68,802 42 % $ 105,350 39 % $ 134,401 45 % Wireless and Sensing 41,696 30 % 48,410 30 % 83,903 31 % 93,949 32 % Protection 40,356 30 % 45,999 28 % 79,247 30 % 86,791 30 % Other: Warrant Shares (1) — — % — — % — — % (21,501 ) (7 )% Total net sales $ 137,146 100 % $ 163,211 100 % $ 268,500 100 % $ 293,640 100 %
Schedule of Revenue from External Customers by Sales Channel	Three Months Ended Six Months Ended (in thousands) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Distributor $ 99,138 $ 109,844 $ 180,280 $ 212,317 Direct 38,008 53,367 88,220 102,824 Other: Warrant Shares — — — (21,501 ) Total net sales $ 137,146 $ 163,211 $ 268,500 $ 293,640
Net Sales Activity By Geographic Region	Net sales activity by geographic region was as follows: Three Months Ended Six Months Ended July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 Asia-Pacific 74 % 75 % 76 % 72 % North America 16 % 19 % 14 % 28 % Europe 10 % 6 % 10 % 7 % Other: Warrant Shares — % — % — % (7 )% 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 Six Months Ended (percentage of total sales) July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 China (including Hong Kong) 52 % 56 % 52 % 53 % United States 9 % 10 % 10 % 12 %

Stock Repurchase Program (Table

Stock Repurchase Program (Tables)	6 Months Ended
	Jul. 28, 2019
Equity [Abstract]
Class of Treasury Stock	The following table summarizes activity under the program for the presented periods: Three Months Ended Six Months Ended July 28, 2019 July 29, 2018 July 28, 2019 July 29, 2018 (in thousands, except number of shares) Shares Price Paid Shares Price Paid Shares Price Paid Shares Price Paid Shares repurchased under the stock repurchase program 446,270 $ 20,000 495,609 $ 24,413 448,481 $ 20,110 1,140,753 $ 49,738

Organization and Basis of Pre_3

Organization and Basis of Presentation (Fiscal Year) (Details)	3 Months Ended		6 Months Ended
	Jul. 28, 2019weeks	Jul. 29, 2018weeks	Jul. 28, 2019weeksweek
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 (Acquisitions) (Details) - USD ($) $ in Thousands	May 02, 2018	Jul. 28, 2019	Jan. 27, 2019	Jul. 29, 2018	Jan. 28, 2018
Business Acquisition [Line Items]
Goodwill		$ 351,141	$ 351,141	$ 346,731	$ 341,897
IC Interconnect, Inc. [Member]
Business Acquisition [Line Items]
Goodwill	$ 4,900
Cash paid to to acquire business	7,400
Tangible net assets acquired	$ 2,500

Organization and Basis of Pre_5

Organization and Basis of Presentation (Legal Settlement) (Details) - USD ($) $ in Millions	Aug. 01, 2018	Apr. 28, 2019	Oct. 28, 2018	Jul. 29, 2018
Loss Contingencies [Line Items]
Legal recoveries	$ 9
Selling, General and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Legal recoveries		$ 1	$ 1.3	$ 6.7

Organization and Basis of Pre_6

Organization and Basis of Presentation (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 28, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 10,919
Total operating lease liabilities	$ 11,683
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 13,000
Total operating lease liabilities		$ 13,800

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		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Earnings Per Share [Abstract]
Net income	$ 5,366	$ 25,169	$ 18,660	$ 37,551
Weighted average common shares outstanding - basic	66,519	66,063	66,312	66,194
Dilutive effect of share-based compensation	1,227	2,817	1,502	2,234
Weighted average common shares outstanding - diluted	67,746	68,880	67,814	68,428
Basic earnings per common share (in dollars per share)	$ 0.08	$ 0.38	$ 0.28	$ 0.57
Diluted earnings per common share (in dollars per share)	$ 0.08	$ 0.37	$ 0.28	$ 0.55
Anti-dilutive shares not included in the above calculations	525	202	443	364

Share-Based Compensation - Narr

Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	Mar. 05, 2019$ / sharesshares	Jul. 29, 2018USD ($)	Apr. 27, 2018shares	Oct. 05, 2016shares	Apr. 28, 2019$ / sharesshares	Apr. 29, 2018USD ($)employeeshares	Jul. 29, 2018USD ($)	Jan. 27, 2019shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares subject to purchase under warrants | shares				1,086,957
Warrants vested (in shares) | shares			586,956
Warrant vesting costs | $		$ 21.5					$ 21.5
Warrant vesting costs due to acceleration | $		$ 15.9					$ 15.9
Number of securities called by warrants (in shares) | shares								869,565
Number of shares affected (in shares) | 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 | shares					106,000
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					$ 55.82
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					$ 59.36
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					$ 61.45
CEO | Market Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards granted | shares					160,000
CEO | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards granted | shares	320,000
Vesting percentage, prorated	70.00%
CEO | 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					$ 55.82
CEO | Performance Period One | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent					25.00%
Grant date fair value per unit	$ 44.32
CEO | 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					$ 59.36
CEO | Performance Period Two | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent					25.00%
Grant date fair value per unit	$ 33.19
CEO | 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					$ 61.45
CEO | Performance Period Three | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent					25.00%
CEO | Performance Period Four | Market Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period					4 years
Grant date fair value per unit					$ 62.98
CEO | Performance Period Four | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent					25.00%
CEO | Average Share Price Equals To Or Exceeds $71.00 | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	30.00%
CEO | Average Share Price Equals Or Exceeds $95.00 | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	70.00%
CEO | Average Share Price Between $71.00 and $95.00 | Market Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	30.00%

Share-Based Compensation - Allo

Share-Based Compensation - Allocation of Share-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 8,646	$ 13,966	$ 19,974	$ 49,481
Revenue Offset
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	0	0	0	21,501
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	402	306	829	633
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	6,082	11,378	14,426	22,840
Product Development And Engineering [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 2,162	$ 2,282	$ 4,719	$ 4,507

Share-Based Compensation - The

Share-Based Compensation - The Schedule of the Assumptions Used (Details) - Market Performance Restricted Stock Units	Mar. 05, 2019$ / shares
Average Share Price Equals To Or Exceeds $71.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life, in years	1 year
Estimated volatility	34.30%
Dividend yield	0.00%
Risk-free interest rate	2.50%
Weighted-average fair value on grant date	$ 44.32
Average Share Price Equals Or Exceeds $95.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life, in years	2 years 1 month 6 days
Estimated volatility	34.30%
Dividend yield	0.00%
Risk-free interest rate	2.50%
Weighted-average fair value on grant date	$ 33.19

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Investment [Line Items]
Debt securities available for sale	$ 7,922	$ 3,105
Convertible debt
Investment [Line Items]
Debt securities available for sale	$ 7,922	$ 3,105
Convertible Debt
Investment [Line Items]
Interest rate	12.00%
Privately Held Company (The Investee) | Convertible debt
Investment [Line Items]
Debt securities available for sale	$ 3,200

Investments - Summary Of Invest

Investments - Summary Of Investments (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Investment [Line Items]
Available-for-sale securities, market value	$ 7,922	$ 3,105
Available-for-sale securities, adjusted cost	7,922	3,105
Available-for-sale securities, gross unrealized gain	0	0
Convertible debt
Investment [Line Items]
Available-for-sale securities, market value	7,922	3,105
Available-for-sale securities, adjusted cost	7,922	3,105
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	Jul. 28, 2019	Jan. 27, 2019
Market Value
Within 1 year	$ 1,013	$ 3,105
After 1 year through 5 years	6,909	0
Total available-for-sale securities	7,922	3,105
Within 1 year	1,013	3,105
After 1 year through 5 years	6,909	0
Total available-for-sale securities	$ 7,922	$ 3,105

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Term loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt	$ 105,938
(Level 2) | Term loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt	105,900	$ 115,300
(Level 2) | Revolving loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	$ 97,000	$ 97,000

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 - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	$ 0	$ 69
Total financial assets	7,922	3,174
Derivative financial instruments	225	0
Total financial liabilities	687	2,623
(Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	0	0
Total financial assets	0	0
Derivative financial instruments	0	0
Total financial liabilities	0	0
(Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	0	69
Total financial assets	0	69
Derivative financial instruments	225	0
Total financial liabilities	225	0
(Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	0	0
Total financial assets	7,922	3,105
Derivative financial instruments	0	0
Total financial liabilities	462	2,623
Convertible debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	7,922	3,105
Convertible debt | (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	0	0
Convertible debt | (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	0	0
Convertible debt | (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	7,922	3,105
AptoVision
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	2,161
AptoVision | (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
AptoVision | (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
AptoVision | (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	2,161
Cycleo
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	462	462
Cycleo | (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
Cycleo | (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	0	0
Cycleo | (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	$ 462	$ 462

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Reconciliation of the Earn-out Liability (Details) $ in Thousands	6 Months Ended
	Jul. 28, 2019USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 2,623
Changes in the fair value of contingent earn-out obligations	(2,161)
Ending balance	462
AptoVision
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	2,161
Changes in the fair value of contingent earn-out obligations	(2,161)
Ending balance	0
Cycleo
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	462
Changes in the fair value of contingent earn-out obligations	0
Ending balance	$ 462

Inventories - Summary of Invent

Inventories - Summary of Inventories (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 2,271	$ 2,057
Work in progress	52,863	44,530
Finished goods	19,926	17,092
Inventories	$ 75,060	$ 63,679

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018
Goodwill [Roll Forward]
Beginning balance	$ 351,141	$ 341,897
Additions	0	4,834
Ending balance	351,141	346,731
Signal Integrity
Goodwill [Roll Forward]
Beginning balance	274,085	274,085
Additions	0	0
Ending balance	274,085	274,085
Wireless and Sensing
Goodwill [Roll Forward]
Beginning balance	72,128	67,812
Additions	0	0
Ending balance	72,128	67,812
Protection
Goodwill [Roll Forward]
Beginning balance	4,928	0
Additions	0	4,834
Ending balance	$ 4,928	$ 4,834

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 28, 2019	Jan. 27, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 94,089	$ 201,961
Accumulated amortization	(68,883)	(167,703)
Total expected amortization expense	25,206	34,258
Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	88,088	167,930
Accumulated amortization	(64,337)	(136,544)
Total expected amortization expense	$ 23,751	31,386
Core Technologies [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years
Core Technologies [Member] | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	8 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 6,001	34,031
Accumulated amortization	(4,546)	(31,159)
Total expected amortization expense	$ 1,455	$ 2,872
Customer Relationships [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Customer Relationships [Member] | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018	Jan. 27, 2019
Finite-Lived Intangible Assets [Line Items]
2020	$ 7,470		$ 7,470
2021	7,978		7,978
2022	4,655		4,655
2023	3,714		3,714
2024	1,389		1,389
Thereafter	0		0
Total expected amortization expense	25,206		25,206		$ 34,258
Intangible amortization	3,908	$ 6,480	9,051	$ 13,441
Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
2020	6,604		6,604
2021	7,389		7,389
2022	4,655		4,655
2023	3,714		3,714
2024	1,389		1,389
Thereafter	0		0
Total expected amortization expense	23,751		23,751		31,386
Intangible amortization	3,475	5,047	7,634	10,575
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
2020	866		866
2021	589		589
2022	0		0
2023	0		0
2024	0		0
Thereafter	0		0
Total expected amortization expense	1,455		1,455		$ 2,872
Intangible amortization	$ 433	$ 1,433	$ 1,417	$ 2,866

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Indefinite-lived Intangible Assets Resulting From Additions to IPR&D (Details) $ in Thousands	6 Months Ended
	Jul. 28, 2019USD ($)
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	Jul. 28, 2019	Jan. 27, 2019
Debt Instrument [Line Items]
Total debt	$ 202,938	$ 212,312
Current portion, net	(18,294)	(18,269)
Total long-term debt	184,644	194,043
Debt issuance costs	(952)	(1,198)
Total long-term debt, net of debt issuance costs	$ 183,692	$ 192,845
Weighted-average interest rate	3.90%	4.14%
Term loans
Debt Instrument [Line Items]
Total debt	$ 105,938	$ 115,312
Revolving loans
Debt Instrument [Line Items]
Total debt	$ 97,000	$ 97,000

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details) - USD ($)	Jul. 28, 2019	Jan. 27, 2019	Nov. 15, 2016
Amounts outstanding	$ 202,938,000	$ 212,312,000
Term loans
Facilities, maximum borrowing capacity			$ 150,000,000
Amounts outstanding	105,938,000	115,312,000
Revolving loans
Facilities, maximum borrowing capacity			$ 250,000,000
Undrawn revolving commitments	153,000,000
Amounts outstanding	97,000,000	$ 97,000,000
Swingline Loans [Member]
Long-term line of credit	0
Foreign Line of Credit [Member]
Long-term line of credit	$ 0

Long-Term Debt - Scheduled Matu

Long-Term Debt - Scheduled Maturities of Term Loans (Details) - Term loans $ in Thousands	Jul. 28, 2019USD ($)
Debt Instrument [Line Items]
2020	$ 9,375
2021	19,688
2022	76,875
Total debt	$ 105,938

Long-Term Debt - Schedule of In

Long-Term Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Debt Disclosure [Abstract]
Contractual interest	$ 2,475	$ 2,067	$ 4,817	$ 4,121
Amortization of debt discount	86	94	174	190
Amortization of debt issuance costs	36	39	73	79
Total interest expense	$ 2,597	$ 2,200	$ 5,064	$ 4,390

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 28, 2019	Jan. 27, 2019
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%
Net tax benefits, if recognized, would impact the effective tax rate	$ 11	$ 4.5

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Contingencies (Details) $ in Thousands	6 Months Ended
	Jul. 28, 2019USD ($)
Income Tax Disclosure [Abstract]
Balance at January 27, 2019	$ 18,293
Additions/(decreases) based on tax positions related to the current fiscal year	6,614
Balance at July 28, 2019	$ 24,907

Income Taxes - Liability For Un

Income Taxes - Liability For Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Income Tax Contingency [Line Items]
Total accrued taxes	$ 23,579	$ 16,971
Deferred tax assets - non-current
Income Tax Contingency [Line Items]
Total accrued taxes	12,569	12,492
Other long-term liabilities
Income Tax Contingency [Line Items]
Total accrued taxes	$ 11,010	$ 4,479

Income Taxes - Regional Income

Income Taxes - Regional Income (Loss) From Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (6,426)	$ (3,524)	$ (14,894)	$ (11,224)
Foreign	20,590	34,802	40,451	37,405
Income before taxes and equity in net gains (losses) of equity method investments	$ 14,164	$ 31,278	$ 25,557	$ 26,181

Leases (Details)

Leases (Details) $ in Millions	6 Months Ended
	Jul. 28, 2019USD ($)
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - operating leases	4 years
Maximum renewal term	5 years
Termination period	1 year
Lease not yet commenced	$ 3.2
Lease not yet commenced, term	7 years
Minimum
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - operating leases	1 year
Maximum
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - operating leases	7 years

Leases - The Components of Leas

Leases - The Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 28, 2019	Jul. 28, 2019
Leases [Abstract]
Operating lease cost	$ 1,214	$ 2,428
Short-term lease cost	83	161
Sublease income	(32)	(65)
Total lease cost	$ 1,265	$ 2,524

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) $ in Thousands	6 Months Ended
	Jul. 28, 2019USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities	$ 2,560
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 25

Leases - Other Information (Det

Leases - Other Information (Details)	Jul. 28, 2019
Leases [Abstract]
Weighted-average remaining lease term - operating leases	4 years
Weighted-average discount rate - operating leases	6.70%

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Jul. 28, 2019USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 10,919
Other current liabilities	4,011
Operating lease liabilities	7,672
Total operating lease liabilities	$ 11,683

Leases - Maturity (Details)

Leases - Maturity (Details) $ in Thousands	Jul. 28, 2019USD ($)
Leases [Abstract]
2020 (remaining six months)	$ 2,531
2021	3,864
2022	2,492
2023	1,461
2024	1,191
2025	1,022
Thereafter	874
Total lease payments	13,435
Less: imputed interest	(1,752)
Total	$ 11,683

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 28, 2019	Jul. 28, 2019	Jan. 27, 2019
Commitments and Contingencies [Line Items]
Restructuring expense	$ 2,000	$ 2,100
Earn-out liability recorded	4,829	4,829	$ 6,675
Amount expected to be settled within twelve months	4,829	4,829
Cycleo
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate	11,300	11,300
Earn-out liability recorded	4,829	4,829	4,514
Amount expected to be settled within twelve months	4,829	4,829
AptoVision
Commitments and Contingencies [Line Items]
Earn-out liability recorded	0	0	2,161
Amount expected to be settled within twelve months	0	0
Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	2,200	2,200
Payment towards remediation plan		3,700
Minimum | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	5,900	5,900
Maximum | AptoVision
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate	35,300	35,300
Maximum | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss	7,500	7,500
Other Assets
Commitments and Contingencies [Line Items]
Cash surrender value of life insurance	$ 22,700	$ 22,700	$ 20,400

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Earn-out Liability (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	$ 4,829	$ 6,675
Amount expected to be settled within twelve months	4,829
Compensation expense
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	4,367	4,052
Not conditional upon continued employment
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	462	2,623
Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	4,829	4,514
Amount expected to be settled within twelve months	4,829
Cycleo | Compensation expense
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	4,367	4,052
Cycleo | Not conditional upon continued employment
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	462	462
AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	0	2,161
Amount expected to be settled within twelve months	0
AptoVision | Compensation expense
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	0	0
AptoVision | Not conditional upon continued employment
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded	$ 0	$ 2,161

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Liability for Deferred Compensation (Details) (Details) - Deferred Compensation Plan For Officers And Executives - USD ($) $ in Thousands	Jul. 28, 2019	Jan. 27, 2019
Loss Contingencies [Line Items]
Total deferred compensation liabilities under this plan	$ 32,356	$ 29,454
Accrued liabilities
Loss Contingencies [Line Items]
Accrued liabilities	1,403	2,203
Other long-term liabilities
Loss Contingencies [Line Items]
Other long-term liabilities	$ 30,953	$ 27,251

Concentration of Risk - Narrati

Concentration of Risk - Narrative (Details)	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Net sales
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Net sales | Distributor concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	72.00%	67.00%	67.00%	67.00%
China | Cost of Silicon Wafers | Supplier concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%	15.00%	20.00%	15.00%
Israel | Cost of Silicon Wafers | Supplier concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	16.00%	13.00%	12.00%

Concentration of Risk - Schedul

Concentration of Risk - Schedule of Significant Customers Accounting for at Least 10% of Net Sales During Period (Details)	Jul. 28, 2019	Jan. 27, 2019	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Net sales
Concentration Risk [Line Items]
Concentration risk, percentage			100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk | Accounts Receivable | Trend-tek Technology Ltd (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%	11.00%
Customer Concentration Risk | Accounts Receivable | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%	10.00%
Customer Concentration Risk | Net sales | Trend-tek Technology Ltd (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			14.00%	13.00%	13.00%	13.00%
Customer Concentration Risk | Net sales | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%	13.00%	10.00%	10.00%
Customer Concentration Risk | Net sales | Arrow Electronics (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			9.00%	10.00%	9.00%	11.00%
Customer Concentration Risk | Net sales | Huawei Technologies Co., Ltd. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			5.00%	9.00%	10.00%	7.00%
Customer Concentration Risk | Net sales | Samsung Electronics (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			3.00%	7.00%	6.00%	7.00%
Customer Concentration Risk | Net sales | Premier Technical Sales Korea, Inc. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			8.00%	4.00%	7.00%	5.00%
United States | Geographic Concentration Risk [Member] | Net sales
Concentration Risk [Line Items]
Concentration risk, percentage			9.00%	10.00%	10.00%	12.00%

Segment Information - Narrative

Segment Information - Narrative (Details) $ in Millions	Jul. 29, 2018USD ($)	Jul. 28, 2019operating_segmentreportable_segment	Jul. 29, 2018USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | operating_segment		3
Number of reportable segments | reportable_segment		1
Warrant vesting costs	$ 21.5		$ 21.5
Warrant vesting costs due to acceleration	$ 15.9		$ 15.9
Net sales
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		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Revenue from External Customer [Line Items]
Net sales	$ 137,146	$ 163,211	$ 268,500	$ 293,640
Semiconductor Products Group
Revenue from External Customer [Line Items]
Net sales	$ 137,146	$ 163,211	$ 268,500	$ 293,640

Segment Information - Income by

Segment Information - Income by Segment and Reconciliation to Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,548	$ 32,936	$ 28,365	$ 29,839
Items to reconcile segment operating income to consolidated income before taxes:
Share-based compensation	8,646	13,966	19,974	49,481
Intangible amortization	3,908	6,480	9,051	13,441
Changes in the fair value of contingent earn-out obligations	0	(900)	(2,161)	(900)
Interest expense	2,597	2,200	5,064	4,390
Non-operating expense, net	(1,213)	(542)	(2,256)	(732)
Income before taxes and equity in net gains (losses) of equity method investments	14,164	31,278	25,557	26,181
Corporate, Non-Segment [Member]
Items to reconcile segment operating income to consolidated income before taxes:
Share-based compensation	8,646	13,966	19,974	49,481
Intangible amortization	3,908	6,480	9,051	13,441
Changes in the fair value of contingent earn-out obligations	0	(900)	(2,161)	(900)
Restructuring and other reserves	2,571	85	2,711	431
Litigation cost, net of recoveries	799	(5,857)	725	(5,297)
Transaction and integration related	33	400	1,468	927
Interest expense	2,597	2,200	5,064	4,390
Non-operating expense, net	(1,213)	(542)	(2,256)	(732)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	31,505	47,110	60,133	87,922
Semiconductor Products Group
Segment Reporting Information [Line Items]
Operating income (loss)	$ 31,505	$ 47,110	$ 60,133	$ 87,922

Segment Information - Revenue b

Segment Information - Revenue by Product Line (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Revenue from External Customer [Line Items]
Net sales	$ 137,146,000	$ 163,211,000	$ 268,500,000	$ 293,640,000
Signal Integrity
Revenue from External Customer [Line Items]
Net sales	55,094,000	68,802,000	105,350,000	134,401,000
Wireless and Sensing
Revenue from External Customer [Line Items]
Net sales	41,696,000	48,410,000	83,903,000	93,949,000
Protection
Revenue from External Customer [Line Items]
Net sales	40,356,000	45,999,000	79,247,000	86,791,000
Other: Warrant Shares
Revenue from External Customer [Line Items]
Net sales offset	$ 0	$ 0	$ 0	$ (21,501,000)
Net sales
Revenue from External Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Net sales | Signal Integrity
Revenue from External Customer [Line Items]
Concentration risk, percentage	40.00%	42.00%	39.00%	45.00%
Net sales | Wireless and Sensing
Revenue from External Customer [Line Items]
Concentration risk, percentage	30.00%	30.00%	31.00%	32.00%
Net sales | Protection
Revenue from External Customer [Line Items]
Concentration risk, percentage	30.00%	28.00%	30.00%	30.00%
Net sales | Other: Warrant Shares
Revenue from External Customer [Line Items]
Concentration risk, percentage	0.00%	0.00%	0.00%	(7.00%)

Segment Information - Revenue_2

Segment Information - Revenue by Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 137,146	$ 163,211	$ 268,500	$ 293,640
Distributor
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	99,138	109,844	180,280	212,317
Direct
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	38,008	53,367	88,220	102,824
Other: Warrant Shares
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue offset	$ 0	$ 0	$ 0	$ 21,501

Segment Information - Net Sal_2

Segment Information - Net Sales Activity by Geographic Region (Details)	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Other: Warrant Shares
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	0.00%	0.00%	(7.00%)
Net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Net sales | Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	74.00%	75.00%	76.00%	72.00%
Net sales | North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	16.00%	19.00%	14.00%	28.00%
Net sales | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.00%	6.00%	10.00%	7.00%

Segment Information - Summary o

Segment Information - Summary of Sales Activity to Countries that Represented Greater than 10% of Total Net Sales (Details) - Net sales	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
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)
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	52.00%	56.00%	52.00%	53.00%
Geographic Concentration Risk [Member] | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.00%	10.00%	10.00%	12.00%

Stock Repurchase Program - Narr

Stock Repurchase Program - Narrative (Details) - USD ($)	Jul. 28, 2019	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018	May 24, 2018
Equity [Abstract]
Additional stock repurchase amount authorized						$ 250,000,000
Shares repurchased under the stock repurchase program, value	$ 287,700,000	$ 20,000,000	$ 24,414,000	$ 20,110,000	$ 49,739,000
Remaining authorization under stock repurchase program	$ 160,700,000	$ 160,700,000		$ 160,700,000

Stock Repurchase Program - Summ

Stock Repurchase Program - Summary of Stock Repurchases (Details) - USD ($) $ in Thousands	Jul. 28, 2019	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Equity, Class of Treasury Stock [Line Items]
Shares repurchased under the stock repurchase program, value	$ 287,700	$ 20,000	$ 24,414	$ 20,110	$ 49,739
Shares repurchased under the stock repurchase program
Equity, Class of Treasury Stock [Line Items]
Shares repurchased under the stock repurchase program, shares		446,270	495,609	448,481	1,140,753
Shares repurchased under the stock repurchase program, value		$ 20,000	$ 24,413	$ 20,110	$ 49,738