Littelfuse (LFUS) 10-Q 27 Oct 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 25, 2021	Oct. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 25, 2021
Document Transition Report	false
Entity File Number	0-20388
Entity Registrant Name	LITTELFUSE INC /DE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3795742
Entity Address, Address Line One	8755 West Higgins Road
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60631
City Area Code	773
Local Phone Number	628-1000
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	LFUS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,632,027
Entity Central Index Key	0000889331
Current Fiscal Year End Date	--01-01
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Current assets:
Cash and cash equivalents	$ 690,682	$ 687,525
Short-term investments	28	54
Trade receivables, less allowances of $53,006 and $45,237 at September 25, 2021 and December 26, 2020, respectively	325,739	232,760
Inventories	357,024	258,002
Prepaid income taxes and income taxes receivable	2,695	3,029
Prepaid expenses and other current assets	59,768	35,939
Total current assets	1,435,936	1,217,309
Net property, plant, and equipment	364,329	344,178
Intangible assets, net of amortization	295,766	291,887
Goodwill	847,205	816,812
Investments	39,885	30,547
Deferred income taxes	9,575	11,224
Right of use lease assets, net	24,375	17,615
Other assets	21,447	18,021
Total assets	3,038,518	2,747,593
Current liabilities:
Accounts payable	221,889	145,984
Accrued liabilities	139,670	110,478
Accrued income taxes	32,462	19,186
Current portion of long-term debt	27,619	0
Total current liabilities	421,640	275,648
Long-term debt, less current portion	620,112	687,034
Deferred income taxes	50,365	50,134
Accrued post-retirement benefits	42,026	45,802
Non-current operating lease liabilities	17,440	12,950
Other long-term liabilities	65,537	67,252
Shareholders’ equity:
Common stock, par value $0.01 per share: 34,000,000 shares authorized; shares issued, September 25, 2021–26,292,015; December 26, 2020–26,131,544	260	259
Additional paid-in capital	935,351	907,858
Treasury stock, at cost: 1,664,571 and 1,644,283 shares, respectively	(248,078)	(242,366)
Accumulated other comprehensive loss	(95,528)	(91,157)
Retained earnings	1,229,262	1,034,048
Littelfuse, Inc. shareholders’ equity	1,821,267	1,608,642
Non-controlling interest	131	131
Total equity	1,821,398	1,608,773
Total liabilities and equity	$ 3,038,518	$ 2,747,593

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Statement of Financial Position [Abstract]
Allowance for trade receivables	$ 53,006	$ 45,237
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	34,000,000	34,000,000
Common stock issued (in shares)	26,292,015	26,131,544
Treasury stock (in shares)	1,664,571	1,644,283

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Income Statement [Abstract]
Net sales	$ 539,581	$ 391,566	$ 1,526,863	$ 1,044,999
Cost of sales	325,009	252,735	954,429	681,910
Gross profit	214,572	138,831	572,434	363,089
Selling, general, and administrative expenses	67,468	49,929	199,071	154,328
Research and development expenses	15,779	12,963	46,912	40,587
Amortization of intangibles	10,446	10,104	31,608	29,912
Restructuring, impairment, and other charges	772	1,277	1,998	40,904
Total operating expenses	94,465	74,273	279,589	265,731
Operating income	120,107	64,558	292,845	97,358
Interest expense	4,602	4,988	13,901	16,261
Foreign exchange loss (gain)	3,154	(6,174)	8,315	(9,600)
Other income, net	(1,240)	(1,682)	(10,867)	(1,643)
Income before income taxes	113,591	67,426	281,496	92,340
Income taxes	21,537	12,070	49,634	21,331
Net income	$ 92,054	$ 55,356	$ 231,862	$ 71,009
Earnings per share:
Basic (in dollars per share)	$ 3.74	$ 2.27	$ 9.43	$ 2.92
Diluted (in dollars per share)	$ 3.69	$ 2.25	$ 9.31	$ 2.89
Weighted-average shares and equivalent shares outstanding:
Basic (in shares)	24,622	24,357	24,582	24,354
Diluted (in shares)	24,926	24,573	24,904	24,535

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 92,054	$ 55,356	$ 231,862	$ 71,009
Other comprehensive income (loss):
Pension and postemployment adjustment, net of tax	487	563	1,270	(9,715)
Foreign currency translation adjustments	(5,441)	16,418	(5,641)	9,300
Comprehensive income	$ 87,100	$ 72,337	$ 227,491	$ 70,594

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 26, 2020USD ($)	Sep. 25, 2021USD ($)	Sep. 26, 2020USD ($)
OPERATING ACTIVITIES
Net income	$ 55,356	$ 231,862	$ 71,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	14,200	41,441	41,953
Amortization of intangibles	10,104	31,608	29,912
Deferred revenue		(2,154)	(438)
Non-cash inventory charges		6,807	0
Impairment charges	0	0	36,078
Stock-based compensation		16,010	14,544
Gain on investments and other assets		(9,739)	(1,200)
Deferred income taxes		1,116	1,567
Other		11,735	(8,549)
Changes in operating assets and liabilities:
Trade receivables		(83,793)	(29,362)
Inventories		(71,232)	(1,611)
Accounts payable		53,945	6,661
Accrued liabilities and income taxes		23,294	(2,095)
Prepaid expenses and other assets		(10,236)	5,787
Net cash provided by operating activities		240,664	164,256
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired		(110,646)	0
Purchases of property, plant, and equipment		(57,526)	(41,536)
Net proceeds from sale of property, plant and equipment, and other		2,561	148
Net cash used in investing activities		(165,611)	(41,388)
FINANCING ACTIVITIES
Proceeds of revolving credit facility		0	240,000
Payments of revolving credit facility		(30,000)	(60,000)
Payments of term loan		0	(145,000)
Net proceeds related to stock-based award activities		5,771	6,437
Purchases of common stock		0	(22,927)
Debt issuance costs		0	(1,786)
Cash dividends paid		(36,648)	(35,100)
Net cash used in financing activities		(60,877)	(18,376)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		(5,832)	6,259
Increase in cash, cash equivalents, and restricted cash		8,344	110,751
Cash, cash equivalents, and restricted cash at beginning of period		687,525	531,139
Cash, cash equivalents, and restricted cash at end of period	641,890	695,869	641,890
Supplementary Cash Flow Information
Cash and cash equivalents	641,890	690,682	641,890
Restricted cash included in prepaid expenses and other current assets	0	3,483	0
Restricted cash included in other assets	0	1,704	0
Cash paid interest during the period	$ 6,400	14,830	17,228
Capital expenditures, not yet paid		$ 9,234	$ 6,267

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Addl. Paid in Capital	Treasury Stock	Accum. Other Comp. (Loss)	Retained Earnings	Non-controlling Interest
Balance at Dec. 28, 2019	$ 1,496,014	$ 256	$ 867,996	$ (216,447)	$ (106,823)	$ 950,901	$ 131
Increase (Decrease) in Stockholders' Equity
Net income	24,644					24,644
Other comprehensive loss, net of tax	(14,979)				(14,979)
Stock-based compensation	2,965		2,965
Withheld shares on restricted share units for withholding taxes	(443)			(443)
Stock options exercised	3,399		3,399
Repurchases of common stock	(22,927)			(22,927)
Cash dividends paid	(11,725)					(11,725)
Balance at Mar. 28, 2020	1,476,948	256	874,360	(239,817)	(121,802)	963,820	131
Balance at Dec. 28, 2019	1,496,014	256	867,996	(216,447)	(106,823)	950,901	131
Increase (Decrease) in Stockholders' Equity
Net income	71,009
Other comprehensive loss, net of tax	(415)
Repurchases of common stock	(22,900)
Balance at Sep. 26, 2020	1,529,562	258	891,924	(242,323)	(107,238)	986,810	131
Balance at Mar. 28, 2020	1,476,948	256	874,360	(239,817)	(121,802)	963,820	131
Increase (Decrease) in Stockholders' Equity
Net income	(8,991)					(8,991)
Other comprehensive loss, net of tax	(2,417)				(2,417)
Stock-based compensation	7,887		7,887
Withheld shares on restricted share units for withholding taxes	(2,375)			(2,375)
Stock options exercised	3,060	1	3,059
Cash dividends paid	(11,678)					(11,678)
Balance at Jun. 27, 2020	1,462,434	257	885,306	(242,192)	(124,219)	943,151	131
Increase (Decrease) in Stockholders' Equity
Net income	55,356					55,356
Other comprehensive loss, net of tax	16,981				16,981
Stock-based compensation	3,692		3,692
Withheld shares on restricted share units for withholding taxes	(131)			(131)
Stock options exercised	2,927	1	2,926
Cash dividends paid	(11,697)					(11,697)
Balance at Sep. 26, 2020	1,529,562	258	891,924	(242,323)	(107,238)	986,810	131
Balance at Dec. 26, 2020	1,608,773	259	907,858	(242,366)	(91,157)	1,034,048	131
Increase (Decrease) in Stockholders' Equity
Net income	57,713					57,713
Other comprehensive loss, net of tax	(4,871)				(4,871)
Stock-based compensation	3,395		3,395
Stock options exercised	7,509		7,509
Cash dividends paid	(11,782)					(11,782)
Balance at Mar. 27, 2021	1,660,737	259	918,762	(242,366)	(96,028)	1,079,979	131
Balance at Dec. 26, 2020	1,608,773	259	907,858	(242,366)	(91,157)	1,034,048	131
Increase (Decrease) in Stockholders' Equity
Net income	231,862
Other comprehensive loss, net of tax	(4,371)
Balance at Sep. 25, 2021	1,821,398	260	935,351	(248,078)	(95,528)	1,229,262	131
Balance at Mar. 27, 2021	1,660,737	259	918,762	(242,366)	(96,028)	1,079,979	131
Increase (Decrease) in Stockholders' Equity
Net income	82,095					82,095
Other comprehensive loss, net of tax	5,454				5,454
Stock-based compensation	8,843		8,843
Withheld shares on restricted share units for withholding taxes	(5,597)			(5,597)
Stock options exercised	2,502	1	2,501
Cash dividends paid	(11,814)					(11,814)
Balance at Jun. 26, 2021	1,742,220	260	930,106	(247,963)	(90,574)	1,150,260	131
Increase (Decrease) in Stockholders' Equity
Net income	92,054					92,054
Other comprehensive loss, net of tax	(4,954)				(4,954)
Stock-based compensation	3,772		3,772
Withheld shares on restricted share units for withholding taxes	(115)			(115)
Stock options exercised	1,473		1,473
Cash dividends paid	(13,052)					(13,052)
Balance at Sep. 25, 2021	$ 1,821,398	$ 260	$ 935,351	$ (248,078)	$ (95,528)	$ 1,229,262	$ 131

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - $ / shares	3 Months Ended
	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends paid, per share (in dollars per share)	$ 0.53	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48

Summary of Significant Accounti

Summary of Significant Accounting Policies and Other Information	9 Months Ended
	Sep. 25, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Other Information	Summary of Significant Accounting Policies and Other Information Nature of Operations Founded in 1927, Littelfuse is an industrial technology manufacturing company empowering a sustainable, connected, and safer world. Across more than 15 countries, and with 12,000 global associates, we partner with customers to design and deliver innovative, reliable solutions. Serving over 100,000 end customers, our products are found in a variety of industrial, transportation and electronics end markets – everywhere, every day. Basis of Presentation The Company’s accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheets, statements of net income and comprehensive income, statements of cash flows, and statement of stockholders' equity prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. They have been prepared in accordance with accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 26, 2020 which should be read in conjunction with the disclosures therein. In the opinion of management, all adjustments considered necessary for a fair presentation have been included and are of a normal, recurring nature. Operating results for interim periods are not necessarily indicative of annual operating results. Revenue Recognition Revenue Disaggregation The following tables disaggregate the Company’s revenue by primary business units for the three and nine months ended September 25, 2021 and September 26, 2020: Three Months Ended September 25, 2021 Nine Months Ended September 25, 2021 (in thousands) Electronics Automotive Industrial Electronics Automotive Industrial Electronics – Passive Products and Sensors $ 171,299 $ — $ — $ 171,299 $ 459,012 $ — $ — $ 459,012 Electronics – Semiconductor 175,941 — — 175,941 500,110 — — 500,110 Passenger Car Products — 64,630 — 64,630 — 200,579 — 200,579 Automotive Sensors — 24,112 — 24,112 — 79,081 — 79,081 Commercial Vehicle Products — 35,673 — 35,673 — 106,602 — 106,602 Industrial Products — — 67,926 67,926 — — 181,479 181,479 Total $ 347,240 $ 124,415 $ 67,926 $ 539,581 $ 959,122 $ 386,262 $ 181,479 $ 1,526,863 Three Months Ended September 26, 2020 Nine Months Ended September 26, 2020 (in thousands) Electronics Automotive Industrial Total Electronics Automotive Industrial Total Electronics – Passive Products and Sensors $ 108,253 $ — $ — $ 108,253 $ 285,697 $ — $ — $ 285,697 Electronics – Semiconductor 147,096 — — 147,096 407,112 — — 407,112 Passenger Car Products — 52,691 — 52,691 — 135,645 — 135,645 Automotive Sensors — 26,093 — 26,093 — 64,166 — 64,166 Commercial Vehicle Products — 25,940 — 25,940 — 71,682 — 71,682 Industrial Products — — 31,493 31,493 — — 80,697 80,697 Total $ 255,349 $ 104,724 $ 31,493 $ 391,566 $ 692,809 $ 271,493 $ 80,697 $ 1,044,999 See Note 15, Segment Information for net sales by segment and countries. Revenue Recognition The Company recognizes revenue on product sales in the period in which the Company satisfies its performance obligation and control of the product is transferred to the customer. The Company’s sales arrangements with customers are predominately short term in nature and generally provide for transfer of control at the time of shipment as this is the point at which title and risk of loss of the product transfers to the customer. At the end of each period, for those shipments where title to the products and the risk of loss and rewards of ownership do not transfer until the product has been received by the customer, the Company adjusts revenues and cost of sales for the delay between the time that the products are shipped and when they are received by the customer. The amount of revenue recorded reflects the consideration to which the Company expects to be entitled in exchange for goods and may include adjustments for customer allowance, rebates and price adjustments. The Company’s distribution channels are primarily through direct sales and independent third-party distributors. The Company elected the practical expedient under Accounting Standards Codification ("ASC") 340-40-25-4 to expense commissions when incurred as the amortization period of the commission asset the Company would have otherwise recognized is less than one year. Revenue and Billing The Company generally accepts orders from customers through receipt of purchase orders or electronic data interchange based on written sales agreements and purchasing contracts. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing is often negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is invoiced when the Company’s products are shipped to them in accordance with the terms of the sales agreement. As the Company’s standard payment terms are less than one year, the Company elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company also elected the practical expedient provided in ASC 606-10-25-18B to treat all product shipping and handling activities as fulfillment activities, and therefore recognize the gross revenue associated with the contract, inclusive of any shipping and handling revenue. Ship and Debit Program Some of the terms of the Company’s sales agreements and normal business conditions provide customers (distributors) the ability to receive price adjustments on products previously shipped and invoiced. This practice is common in the industry and is referred to as a “ship and debit” program. This program allows the distributor to debit the Company for the difference between the distributors’ contracted price and a lower price for specific transactions. Under certain circumstances (usually in a competitive situation or large volume opportunity), a distributor will request authorization for pricing allowances to reduce its price. When the Company approves such a reduction, the distributor is authorized to “debit” its account for the difference between the contracted price and the lower approved price. The Company establishes reserves for this program based on historic activity, electronic distributor inventory levels and actual authorizations for the debit and recognizes these debits as a reduction of revenue. Return to Stock The Company has a return to stock policy whereby certain customers, with prior authorization from Littelfuse management, can return previously purchased goods for full or partial credit. The Company establishes an estimated allowance for these returns based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated returns. Volume Rebates The Company offers volume based sales incentives to certain customers to encourage greater product sales. If customers achieve their specific quarterly or annual sales targets, they are entitled to rebates. The Company estimates the projected amount of rebates that will be achieved by the customer and recognizes this estimated cost as a reduction to revenue as products are sold. Cash, Cash Equivalents and Restricted Cash The following table provides a reconciliation of cash, cash equivalents and restricted cash at September 25, 2021 and December 26, 2020 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statement of Cash Flows. (in thousands) September 25, December 26, Cash and cash equivalents $ 690,682 $ 687,525 Restricted cash included in prepaid expenses and other current assets 3,483 — Restricted cash included in other assets 1,704 $ — Total cash, cash equivalents and restricted cash $ 695,869 $ 687,525 Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update ("ASU") No. 2019-12, "Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes" as part of its initiative to reduce complexity in the accounting standards. The guidance is effective for fiscal years beginning after December 15, 2020 with early adoption permitted. The adoption of ASU 2019-12 did not have a material impact on our Condensed Consolidated Financial Statements.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 25, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions The Company accounts for acquisitions using the acquisition method in accordance with ASC 805, “Business Combinations,” in which assets acquired and liabilities assumed are recorded at fair value as of the date of acquisition. The operating results of the acquired business are included in the Company’s Consolidated Financial Statements from the date of the acquisition. Hartland Controls On January 28, 2021, the Company acquired Hartland Controls ("Hartland"), a manufacturer and leading supplier of electrical components used primarily in heating, ventilation, air conditioning (HVAC) and other industrial and control systems applications with annualized sales of approximately $70 million. The purchase price for Hartland was $112.3 million and the operations of Hartland are included in the Industrial segment. The total purchase consideration of $109.9 million, net of cash, cash equivalents, and restricted cash has been allocated, on a preliminary basis, to assets acquired and liabilities assumed, as of the completion of the acquisition, based on preliminary estimated fair values. The purchase consideration is subject to change for the final working capital adjustments. As of September 25, 2021, the Company had restricted cash of $1.7 million in an escrow account for general indemnification purposes. The following table summarizes the final purchase price allocation of the fair value of assets acquired and liabilities assumed in the Hartland acquisition: (in thousands) Purchase Price Total purchase consideration: Cash, net of cash acquired, and restricted cash $ 109,852 Allocation of consideration to assets acquired and liabilities assumed: Trade receivables, net 13,027 Inventories 35,808 Other current assets 2,224 Property, plant, and equipment 6,296 Intangible assets 39,660 Goodwill 40,442 Other non-current assets 3,787 Current liabilities (24,846) Other non-current liabilities (6,546) $ 109,852 All Hartland goodwill, other assets and liabilities were recorded in the Industrial segment and are primarily reflected in the Americas and Asia-Pacific geographic areas. The goodwill resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining Hartland’s products and technology with the Company’s existing industrial products portfolio. Goodwill resulting from the Hartland acquisition is not expected to be deductible for tax purposes. Included in the Company’s Condensed Consolidated Statements of Net Income for the three and nine months ended September 25, 2021 are net sales of $29.3 million and $72.3 million respectively, and an income (loss) before income taxes of $1.2 million and $(1.3) million, respectively since the January 28, 2021 acquisition of Hartland. The Company recorded a $6.8 million step-up of inventory to its fair value as of the acquisition date based on the preliminary valuation. The step-up was amortized as a non-cash charge to cost of goods sold during the first and second quarters of 2021, as the acquired inventory was sold, and is reflected as other non-segment costs. During the nine months ended September 25, 2021, the Company recognized a charge of $6.8 million for the amortization of this fair value inventory step-up. During the nine months ended September 25, 2021, the Company incurred approximately $0.8 million of legal and professional fees related to this acquisition recognized as Selling, general, and administrative expenses . These costs were reflected as other non-segment costs. Pro Forma Results The following table summarizes, on an unaudited pro forma basis, the combined results of operations of the Company and Hartland as though the acquisition had occurred as of December 29, 2019. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the Hartland acquisition occurred as of December 29, 2019 or of future consolidated operating results. For the Three Months Ended For the Nine Months Ended (in thousands, except per share amounts) September 25, September 26, 2020 September 25, September 26, 2020 Net sales $ 539,581 $ 414,100 $ 1,533,901 $ 1,101,430 Income before income taxes 113,591 69,478 289,530 90,516 Net income 92,054 56,961 238,197 69,526 Net income per share — basic 3.74 2.34 9.69 2.85 Net income per share — diluted 3.69 2.32 9.56 2.83 Pro forma results presented above primarily reflect the following adjustments: For the Three Months Ended For the Nine Months Ended (in thousands) September 25, September 26, 2020 September 25, 2021 September 26, 2020 Amortization (a) $ — $ (838) $ (280) $ (2,514) Depreciation — 44 7 139 Transaction costs (b) — — 835 (835) Amortization of inventory step-up (c) — — 6,808 (6,796) Income tax (expense) benefit of above items — 167 (1,555) 2,107 (a) The amortization adjustment for the three and nine months ended September 26, 2020 primarily reflects incremental amortization resulting from the measurement of intangibles at their fair values. (b) The transaction cost adjustments reflect the reversal of certain legal and professional fees from the nine months ended September 25, 2021 and recognition of those fees during the nine months ended September 26, 2020. (c) The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the nine months ended September 25, 2021 and the recognition of the amortization during the nine months ended September 26, 2020. The inventory step-up was amortized over four months as the inventory was sold.

Inventories

Inventories	9 Months Ended
	Sep. 25, 2021
Inventory Disclosure [Abstract]
Inventories	Inventories The components of inventories at September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, 2021 December 26, 2020 Raw materials $ 121,282 $ 85,394 Work in process 109,347 92,783 Finished goods 161,567 114,641 Inventory Reserves (35,172) (34,816) Total $ 357,024 $ 258,002

Property, Plant, and Equipment

Property, Plant, and Equipment	9 Months Ended
	Sep. 25, 2021
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment	Property, Plant, and Equipment The components of net property, plant, and equipment at September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, 2021 December 26, 2020 Land $ 22,887 $ 22,851 Building 129,135 123,497 Equipment 725,971 678,220 Accumulated depreciation and amortization (513,664) (480,390) Total $ 364,329 $ 344,178 The Company recorded depreciation expense of $14.2 million for both the three months ended September 25, 2021 and September 26, 2020, and $41.4 million and $42.0 million for the nine months ended September 25, 2021 and September 26, 2020, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 25, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The amounts for goodwill and changes in the carrying value by segment for the nine months ended September 25, 2021 are as follows: (in thousands) Electronics Automotive Industrial Total Net book value of goodwill as of December 26, 2020 Gross goodwill as of December 26, 2020 $ 676,325 $ 138,354 $ 47,551 $ 862,230 Accumulated impairment losses as of December 26, 2020 — (36,423) (8,995) (45,418) Total 676,325 101,931 38,556 816,812 Changes during 2021: Additions (a) — 1,614 40,442 42,056 Currency translation (9,530) (2,165) 32 (11,663) Net book value of goodwill as of September 25, 2021 Gross goodwill as of September 25, 2021 666,795 137,783 88,133 892,711 Accumulated impairment losses as of September 25, 2021 — (36,403) (9,103) (45,506) Total $ 666,795 $ 101,380 $ 79,030 $ 847,205 (a) The additions primarily resulted from the acquisition of Hartland. The Company tests its goodwill annually for impairment on the first day of its fiscal fourth quarter, or more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. During the second quarter of 2020, the Company recorded a non-cash charge of $33.8 million to recognize the impairment of goodwill in the automotive sensors reporting unit within the Automotive segment. The goodwill impairment charge was determined using Level 3 inputs, including discounted cash flow analysis and comparable marketplace fair value data. As of September 25, 2021, the automotive sensors reporting unit h ad $9.5 million of remaining goodwill. The components of other intangible assets as of September 25, 2021 and December 26, 2020 are as follows: As of September 25, 2021 (in thousands) Gross Accumulated Amortization Net Book Value Land use rights $ 10,354 $ 2,230 $ 8,124 Patents, licenses and software 142,606 99,834 42,772 Distribution network 43,601 40,306 3,295 Customer relationships, trademarks, and tradenames 399,655 158,080 241,575 Total $ 596,216 $ 300,450 $ 295,766 As of December 26, 2020 (in thousands) Gross Accumulated Amortization Net Book Value Land use rights $ 10,280 $ 2,007 $ 8,273 Patents, licenses and software 137,210 92,868 44,342 Distribution network 43,910 38,980 4,930 Customer relationships, trademarks, and tradenames 372,064 137,722 234,342 Total $ 563,464 $ 271,577 $ 291,887 During the three months ended September 25, 2021 and September 26, 2020, the Company recorded amortization expense of $10.4 million and $10.1 million, respectively. During the nine months ended September 25, 2021 and September 26, 2020, the Company recorded amortization expense of $31.6 million and $29.9 million, respectively. The Company recognized a $0.3 million non-cash impairment charge in the first quarter of 2020 on a certain patent triggered by the Company’s announcement to consolidate a manufacturing facility within the Industrial segment. During the nine months ended September 25, 2021, the Company recorded additions to intangible assets of $39.7 million, related to the Hartland acquisition, the components of which were as follows: (in thousands) Weighted Average Useful Life Amount Patents, licenses and software 9.2 $ 7,559 Customer relationships, trademarks, and tradenames 13.7 32,101 Total $ 39,660 Estimated annual amortization expense related to intangible assets with definite lives as of September 25, 2021 is as follows: (in thousands) Amount 2021 $ 41,922 2022 40,761 2023 36,461 2024 33,038 2025 33,019 2026 and thereafter 142,173 Total $ 327,374

Accrued Liabilities

Accrued Liabilities	9 Months Ended
	Sep. 25, 2021
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities The components of accrued liabilities as of September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, 2021 December 26, 2020 Employee-related liabilities $ 80,034 $ 50,689 Operating lease liability 8,649 6,811 Other non-income taxes 5,352 2,126 Professional services 3,375 3,321 Restructuring liability 3,075 4,195 Interest 2,598 4,517 Deferred revenue 867 2,959 Customer liability 740 3,858 Other 34,980 32,002 Total $ 139,670 $ 110,478 Employee-related liabilities consist primarily of payroll, sales commissions, bonus, employee benefit accruals and workers’ compensation. Bonus accruals include amounts earned pursuant to the Company’s primary employee incentive compensation plans. Other accrued liabilities include miscellaneous operating accruals and other client-related liabilities.

Restructuring, Impairment and O

Restructuring, Impairment and Other Charges	9 Months Ended
	Sep. 25, 2021
Restructuring and Related Activities [Abstract]
Restructuring, Impairment and Other Charges	Restructuring, Impairment, and Other Charges The Company recorded restructuring, impairment and other charges for the three and nine months ended September 25, 2021 and September 26, 2020 as follows: Three months ended September 25, 2021 Nine months ended September 25, 2021 (in thousands) Electronics Automotive Industrial Total Electronics Automotive Industrial Total Employee terminations $ 542 $ — $ 133 $ 675 $ 1,094 $ 416 $ 302 $ 1,812 Other restructuring charges — 97 — 97 — 186 — 186 Total restructuring charges 542 97 133 772 1,094 602 302 1,998 Total $ 542 $ 97 $ 133 $ 772 $ 1,094 $ 602 $ 302 $ 1,998 Three months ended September 26, 2020 Nine months ended September 26, 2020 (in thousands) Electronics Automotive Industrial Total Electronics Automotive Industrial Total Employee terminations $ 388 $ 162 $ 648 $ 1,198 $ 2,125 $ 770 $ 1,719 $ 4,614 Other restructuring charges — — 79 79 — 108 104 212 Total restructuring charges 388 162 727 1,277 2,125 878 1,823 4,826 Impairment — — — — — 33,841 2,237 36,078 Total $ 388 $ 162 $ 727 $ 1,277 $ 2,125 $ 34,719 $ 4,060 $ 40,904 2021 For the three and nine months ended September 25, 2021, the Company recorded total restructuring charges of $0.8 million and $2.0 million, primarily for employee termination costs. These charges are primarily related to the reorganization of certain manufacturing, selling and administrative functions within the Electronics and Automotive segments. 2020 For the three and nine months ended September 26, 2020, the Company recorded total restructuring charges of $1.3 million and $4.8 million, respectively, for employee termination costs and other restructuring charges. These charges are primarily related to the reorganization of certain manufacturing, selling and administrative functions across all segments and the announced consolidation of a manufacturing facility within the Industrial segment. The Company also recognized $36.1 million of impairment charges for the nine months ended September 26, 2020, respectively, which included a $33.8 million goodwill impairment charge associated with the automotive sensors reporting unit within the Automotive segment in the second quarter of 2020 and $2.2 million related to the land and building associated with the Company’s previously announced consolidation of a manufacturing facility within the Industrial segment in the first quarter of 2020. The impairment charges of the land and building were included in selling, general, and administrative expenses. See Note 5, Goodwill and Other Intangible Assets for further discussion regarding the goodwill impairment charge. The restructuring liability as of September 25, 2021 and December 26, 2020 i s $3.1 million and $4.2 million, respectively. The restructuring liability is included within accrued liabilities in the Condensed Conso lidated Balance Sheets. The Company anticipates the remaining payments associated with employee terminations will primarily be completed by the third quarter of 2022.

Debt

Debt	9 Months Ended
	Sep. 25, 2021
Debt Disclosure [Abstract]
Debt	Debt The carrying amounts of debt at September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, December 26, Revolving Credit Facility $ 100,000 $ 130,000 Euro Senior Notes, Series A due 2023 137,173 142,679 Euro Senior Notes, Series B due 2028 111,380 115,850 U.S. Senior Notes, Series A due 2022 25,000 25,000 U.S. Senior Notes, Series B due 2027 100,000 100,000 U.S. Senior Notes, Series A due 2025 50,000 50,000 U.S. Senior Notes, Series B due 2030 125,000 125,000 Other 2,619 2,619 Unamortized debt issuance costs (3,441) (4,114) Total debt 647,731 687,034 Less: Current maturities (27,619) — Total long-term debt $ 620,112 $ 687,034 Revolving Credit Facility On April 3, 2020, the Company amended its Credit Agreement to effect certain changes, including, among others: (i) eliminating the $200.0 million unsecured term loan credit facility, the remaining outstanding balance ($140.0 million) of which was repaid in full on April 3, 2020 through the revolving credit facility; (ii) making certain financial and non-financial covenants less restrictive on the Company; (iii) modifying performance-based interest rate margins and undrawn fees; and (iv) extending the maturity date to April 3, 2025. The amended Credit Agreement also allows the Company to increase the size of the revolving credit facility or enter into one or more tranches of term loans if there is no event of default and the Company is in compliance with certain financial covenants. The Company made payments of $30.0 million on the amended revolving credit facility during the nine months ended September 25, 2021. The balance under the facility was $100.0 million as of September 25, 2021. Outstanding borrowings under the amended Credit Agreement bears interest, at the Company’s option, at either LIBOR, fixed for interest periods of one, two, three or six-month periods, plus 1.25% to 2.00%, or at the bank’s Base Rate, as defined, plus 0.25% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company is also required to pay commitment fees on unused portions of the credit agreement ranging from 0.125% to 0.20%, based on the Consolidated Leverage Ratio, as defined in the agreement. The amended Credit Agreement includes representations, covenants and events of default that are customary for financing transactions of this nature . The effective interest rate on outstanding borrowings under the credit facility was 1.33% on September 25, 2021. As of September 25, 2021, the Company had no amount outstanding in letters of credit and had available $600.0 million of borrowing capacity under the Revolving Credit Facility. As of of September 25, 2021, the Company was in compliance with all covenants under the Credit Agreement. Senior Notes On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 8, 2023 (“Euro Senior Notes, Series A due 2023”), and €95 million in aggregate amount of 1.83% Senior Notes, Series B due December 8, 2028 (“Euro Senior Notes, Series B due 2028”) (together, the “Euro Senior Notes”). Interest on the Euro Senior Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017. On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate principal amount of 3.03% Senior Notes, Series A, due February 15, 2022 (“U.S. Senior Notes, Series A due 2022”), and $100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (“U.S. Senior Notes, Series B due 2027”) (together, the “U.S. Senior Notes due 2022 and 2027”) were funded. Interest on the U.S. Senior Notes due 2022 and 2027 is payable semiannually on February 15 and August 15, commencing August 15, 2017. On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and $125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, Series B due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior Notes due 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 is payable semiannually on February 15 and August 15, commencing on August 15, 2018. The Senior Notes have not been registered under the Securities Act, or applicable state securities laws. The Senior Notes are general unsecured senior obligations and rank equal in right of payment with all existing and future unsecured unsubordinated indebtedness of the Company. The Senior Notes are subject to certain customary covenants, including limitations on the Company’s ability, with certain exceptions, to engage in mergers, consolidations, asset sales and transactions with affiliates, to engage in any business that would substantially change the general business of the Company, and to incur liens. In addition, the Company is required to satisfy certain financial covenants and tests relating to, among other matters, interest coverage and leverage. At September 25, 2021, the Company was in compliance with all covenants under the Senior Notes. The Company may redeem the Senior Notes upon the satisfaction of certain conditions and the payment of a make-whole amount to noteholders and are required to offer to repurchase the Senior Notes at par following certain events, including a change of control. Interest paid on all Company debt was $6.1 million and $6.4 million for the three months ended September 25, 2021 and September 26, 2020, respectively, and $14.8 million and $17.2 million for the nine months ended September 25, 2021 and September 26, 2020, respectively.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 25, 2021
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three-level hierarchy of measurements based upon observable and unobservable inputs is used to arrive at fair value. Observable inputs are developed based on market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about valuation based on the best information available in the circumstances. Depending on the inputs, the Company classifies each fair value measurement as follows: Level 1 —Valuations based on unadjusted quoted prices for identical assets or liabilities in active markets; Level 2 —Valuations based upon quoted prices for similar instruments, prices for identical or similar instruments in markets that are not active, or model-derived valuations, all of whose significant inputs are observable, and Level 3 —Valuations based upon one or more significant unobservable inputs. Following is a description of the valuation methodologies used for instruments measured at fair value and their classification in the valuation hierarchy. Cash Equivalents Cash equivalents primarily consist of money market funds, which are held with an institution with sound credit rating and are highly liquid. The Company classified cash equivalents as Level 1 and are valued at cost which approximates fair value. Investments in Equity Securities Investments in equity securities listed on a national market or exchange are valued at the last sales price and classified within Level 1 of the valuation hierarchy and recorded in investments and other assets. Other Investments The Company has certain convertible debt and convertible preferred stock investments that are accounted for under the cost method reflected in other assets in the Condensed Consolidated Balance Sheets. During the nine months ended September 25, 2021, the Company impaired the remaining book value of these investments and recorded an impairment charge of $0.5 million and during the three and nine months ended September 26, 2020, the Company recorded impairment charges of $0.1 million in Other income, net in the Condensed Consolidated Statements of Net Income. As of December 26, 2020, the balance of these investments was $0.5 million. The fair value of these investments is measured on a nonrecurring basis using Level 3 inputs under the fair value hierarchy. Mutual Funds The Company has a non-qualified Supplemental Retirement and Savings Plan which provides additional retirement benefits for certain management employees and named executive officers by allowing participants to defer a portion of their annual compensation. The Company maintains accounts for participants through which participants make investment elections. The marketable securities are classified as Level 1 under the fair value hierarchy as they are maintained in mutual funds with readily determinable fair value and recorded in other assets. There wer e no changes during the quarter ended September 25, 2021 to the Company’s valuation techniques used to measure asset and liability fair values o n a recurring basis. As of September 25, 2021 and December 26, 2020, the Company did not hold any non-financial assets or liabilities that are required to be measured at fair value on a recurring basis. The following table presents assets measured at fair value by classification within the fair value hierarchy as of September 25, 2021: Fair Value Measurements Using (in thousands) Quoted Prices in Significant Significant Total Cash equivalents $ 15,970 $ — $ — $ 15,970 Investments in equity securities 27,358 — — 27,358 Mutual funds 14,711 — — 14,711 Total $ 58,039 $ — $ — $ 58,039 The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 26, 2020: Fair Value Measurements Using (in thousands) Quoted Prices in Significant Significant Total Cash equivalents $ 73,461 $ — $ — $ 73,461 Investments in equity securities 19,186 — — 19,186 Mutual funds 13,249 — — 13,249 Total $ 105,896 $ — $ — $ 105,896 In addition to the methods and assumptions used for the financial instruments recorded at fair value as discussed above, the following methods and assumptions are used to estimate the fair value of other financial instruments that are not marked to market on a recurring basis. The Company’s other financial instruments include cash and cash equivalents, short-term investments, accounts receivable and its long-term debt. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, short-term investments and accounts receivable approximate their fair values. The Company’s revolving credit facilities’ fair values approximate book value at September 25, 2021 and December 26, 2020, as the rates on these borrowings are variable in nature. The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and USD Senior Notes, Series A and Series B, as of September 25, 2021 and December 26, 2020 were as follows: September 25, 2021 December 26, 2020 (in thousands) Carrying Estimated Carrying Estimated Euro Senior Notes, Series A due 2023 $ 137,173 $ 138,825 $ 142,679 $ 144,323 Euro Senior Notes, Series B due 2028 111,380 116,425 115,850 123,588 USD Senior Notes, Series A due 2022 25,000 25,167 25,000 25,437 USD Senior Notes, Series B due 2027 100,000 106,585 100,000 109,552 USD Senior Notes, Series A due 2025 50,000 52,567 50,000 53,474 USD Senior Notes, Series B due 2030 125,000 133,376 125,000 138,036 The Company recognized impairment charges of $1.9 million for the land and building and $0.3 million for a certain patent as a result of the Company’s announcement to consolidate a manufacturing facility within the Industrial segment during the first quarter of 2020. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. The fair value of the land and building was valued using a real estate appraisal and classified as a Level 3 input under the fair value hierarchy.

Benefit Plans

Benefit Plans	9 Months Ended
	Sep. 25, 2021
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans The Company has company-sponsored defined benefit pension plans covering employees in the U.K., Germany, the Philippines, China, Japan, Mexico, Italy and France. The amount of the retirement benefits provided under the plans is based on years of service and final average pay. The Company recognizes interest cost, expected return on plan assets, and amortization of prior service, net within Other income, net in the Condensed Consolidated Statements of Net Income. The components of net periodic benefit cost for the three and nine months ended September 25, 2021 and September 26, 2020 were as follows: For the Three Months Ended For the Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Components of net periodic benefit cost: Service cost $ 684 $ 615 $ 2,086 $ 1,825 Interest cost 434 511 1,317 1,655 Expected return on plan assets (361) (422) (1,099) (1,551) Amortization of prior service and net actuarial loss 327 279 992 688 Net periodic benefit cost $ 1,084 $ 983 $ 3,296 $ 2,617 The Company expects to make approximately $2.2 million of contributions to the plans and pay $3.8 million of benefits directly in 2021. The Company also sponsors certain post-employment plans in foreign countries and other statutory benefit plans. The Company recorded expense of $0.6 million and $0.5 million for the three months ended September 25, 2021 and September 26, 2020 , respectively, and $1.6 million a nd $1.5 million expense for the nine months ended September 25, 2021 and September 26, 2020, respectively, in Cost of Sales and Other income, net within the Condensed Consolidated Statements of Net Income. For the three and nine months ended September 25, 2021 , the pre-tax amounts recognized in other comprehensive income (loss) as components of net periodic benefit costs for these plans were $0.2 million and $0.5 million, respectively . For the three and nine months ended September 26, 2020, the pre-tax amounts recognized in other comprehensive income (loss) as components of net periodic benefit costs for these plans were $0.2 million and $0.5 million, respectively.

Other Comprehensive (Loss) Inco

Other Comprehensive (Loss) Income	9 Months Ended
	Sep. 25, 2021
Equity [Abstract]
Other Comprehensive (Loss) Income	Other Comprehensive (Loss) Income Changes in other comprehensive income (loss) by component were as follows: (in thousands) Three Months Ended Three Months Ended Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Defined benefit pension plan and other adjustments $ 601 $ 114 $ 487 $ 273 $ (290) $ 563 Foreign currency translation adjustments (5,441) — (5,441) 16,418 — 16,418 Total change in other comprehensive (loss) income $ (4,840) $ 114 $ (4,954) $ 16,691 $ (290) $ 16,981 (in thousands) Nine Months Ended Nine Months Ended Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Defined benefit pension plan adjustments $ 1,479 $ 209 $ 1,270 (12,270) (2,555) $ (9,715) Foreign currency translation adjustments (5,641) — (5,641) $ 9,300 $ — $ 9,300 Total change in other comprehensive (loss) income $ (4,162) $ 209 $ (4,371) $ (2,970) $ (2,555) $ (415) Due to the signing of the group annuity contract being a significant change in the U.K. pension plan, the liabilities of the plan were remeasured as of April 6, 2020 resulting in an increase of $13.4 million to unamortized actuarial loss within other comprehensive income (loss). See Note 10, Benefit Plans for further discussion. The following tables set forth the changes in accumulated other comprehensive (loss) by component for the nine months ended September 25, 2021 and September 26, 2020: (in thousands) Defined benefit pension plan and other adjustments Foreign currency Accumulated other Balance at December 26, 2020 $ (34,141) $ (57,016) $ (91,157) Activity in the period 1,270 (5,641) (4,371) Balance at September 25, 2021 $ (32,871) $ (62,657) $ (95,528) (in thousands) Defined benefit pension plan and other adjustments Foreign currency translation adjustment Accumulated other comprehensive (loss) Balance at December 28, 2019 $ (18,046) $ (88,777) $ (106,823) Activity in the period (9,715) 9,300 (415) Balance at September 26, 2020 $ (27,761) $ (79,477) $ (107,238) Amounts reclassified from accumulated other comprehensive (loss) to earnings for the three and nine months ended September 25, 2021 and September 26, 2020 were as follows: Three Months Ended Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Pension and Postemployment plans: Amortization of prior service and net actuarial loss $ 501 $ 452 $ 1,514 $ 1,226 The Company recognizes the amortization of prior service costs in Other income, net within the Condensed Consolidated Statements of Net Income.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 25, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three and nine months ended September 25, 2021 was 19.0% and 17.6%, respectively, compared to the effective tax rate for the three and nine months ended September 26, 2020 of 17.9% and 23.1%, respectively. The effective tax rate for the third quarter of 2021 is higher than the effective tax rate for the comparable 2020 period, primarily due to a reduction during the third quarter of 2020 in the estimated 2020 annual effective tax rate, the impact of which was recorded during the third quarter of 2020. The effective tax rate for the first nine months of 2021 is lower than the effective tax rate for the comparable 2020 period, primarily due to an increase in the forecasted income earned in lower tax jurisdictions in 2021 as compared to 2020, as well as the impact of the goodwill impairment charge of $33.8 million recorded in the second quarter of 2020, the substantial majority of which did not result in a tax benefit in the annual estimated effective tax rate. The effective tax rate for the 2021 period is lower than the applicable U.S. statutory tax rate primarily due to income earned in lower tax jurisdictions.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 25, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended Nine Months Ended (in thousands, except per share amounts) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Numerator: Net income as reported $ 92,054 $ 55,356 $ 231,862 $ 71,009 Denominator: Weighted average shares outstanding Basic 24,622 24,357 24,582 24,354 Effect of dilutive securities 304 216 322 181 Diluted 24,926 24,573 24,904 24,535 Earnings Per Share: Basic earnings per share $ 3.74 $ 2.27 $ 9.43 $ 2.92 Diluted earnings per share $ 3.69 $ 2.25 $ 9.31 $ 2.89 Potential shares of common stock relating to stock options and restricted share units excluded from the earnings per share calculation because their effect would be anti-dilutive were 57,936 and 290,262 for the three months ended September 25, 2021 and September 26, 2020, respectively, and 32,773 and 194,857 for the nine months ended September 25, 2021 and September 26, 2020, respectively. Share Repurchase Program On April 26, 2019, the Company's Board of Directors authorized a program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2019 to April 30, 2020 ("2019 program"). On April 29, 2020, the Company announced that the Board of Directors authorized a new program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2020 to April 30, 2021 (the "2020 program") to replace its previous expired 2019 program. On April 28, 2021, the Company announced that the Board of Directors authorized a new three year program to repurchase up to $300.0 million in the aggregate of shares of the Company’s common stock for the period May 1, 2021 to April 30, 2024 to replace its previous 2020 program.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 25, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has equity ownership in various investments that are accounted for under the equity method. The following is a description of the investments and related party transactions. Powersem GmbH: The Company owns 45% of the outstanding equity of Powersem GmbH (“Powersem”), a module manufacturer based in Germany. EB-Tech Co., Ltd.: The Company owns approximately 19% of the outstanding equity of EB Tech Co., Ltd. (“EB Tech”), a company with expertise in radiation technology based in South Korea. Automated Technology (Phil), Inc. : The Company owns approximately 24% of the outstanding common shares of Automated Technology (Phil), Inc. (“ATEC”), a supplier located in the Philippines that provides assembly and test services. One member of the Company's Board of Directors serves on the Board of Directors of ATEC. For the Three Months Ended September 25, 2021 For the Three Months Ended September 26, 2020 (in millions) Powersem EB Tech ATEC Powersem EB Tech ATEC Sales to related party $ — $ — $ — $ 0.4 $ — $ — Purchase material/service from related party 0.8 0.1 3.1 0.8 — 2.4 For the Nine Months Ended September 25, 2021 For the Nine Months Ended September 26, 2020 (in millions) Powersem EB Tech ATEC Powersem EB Tech ATEC Sales to related party $ 0.2 $ — $ — $ 1.1 $ — $ — Purchase material/service from related party 2.6 0.3 8.9 1.8 — 5.8 September 25, 2021 December 26, 2020 (in millions) Powersem EB Tech ATEC Powersem EB Tech ATEC Accounts receivable balance $ — $ — $ — $ 0.1 $ — $ — Accounts payable balance 0.1 — 2.1 0.1 — 0.2

Segment Information

Segment Information	9 Months Ended
	Sep. 25, 2021
Segment Reporting [Abstract]
Segment Information	Segment Information The Company and its subsidiaries design, manufacture and sell components and modules empowering a sustainable, connected, and safer world. The Company reports its operations by the following segments: Electronics, Automotive, and Industrial. An operating segment is defined as a component of an enterprise that engages in business activities from which it may earn revenues and incur expenses, and about which separate financial information is regularly evaluated by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources. The CODM is the Company’s President and Chief Executive Officer (“CEO”). The CODM allocates resources to and assesses the performance of each operating segment using information about its revenue and operating income before interest and taxes, but does not evaluate the operating segments using discrete balance sheet information. Sales, marketing, and research and development expenses are charged directly into each operating segment. Purchasing, logistics, customer service, finance, information technology, and human resources are shared functions that are allocated back to the three operating segments. The Company does not report inter-segment revenue because the operating segments do not record it. Certain expenses, determined by the CODM to be strategic in nature and not directly related to segments' current results, are not allocated but identified as “Other”. Additionally, the Company does not allocate interest and other income, interest expense, or taxes to operating segments. These costs are not allocated to the segments, as management excludes such costs when assessing the performance of the segments. Although the CODM uses operating income to evaluate the segments, operating costs included in one segment may benefit other segments. Except as discussed above, the accounting policies for segment reporting are the same as for the Company as a whole. • Electronics Segment : Consists of one of the broadest product offerings in the industry, including fuses and fuse accessories, positive temperature coefficient (“PTC”) resettable fuses, polymer electrostatic discharge (“ESD”) suppressors, varistors, reed switch based magnetic sensing, gas discharge tubes; semiconductor products such as discrete transient voltage suppressor (“TVS”) diodes, TVS diode arrays, protection and switching thyristors, metal-oxide-semiconductor field effect transistors (“MOSFETs”) and silicon carbide diodes; and insulated gate bipolar transistors (“IGBT”) technologies. The segment covers a broad range of end markets, including industrial motor drives and power conversion, automotive electronics, electric vehicle and related infrastructure, power supplies, data centers and telecommunications, medical devices, alternative energy, building and home automation, appliances, and mobile electronics. • Automotive Segment: Consists of a wide range of circuit protection, power control and sensing technologies for global original equipment manufacturers (“OEMs”), Tier-I suppliers and parts distributors in passenger car, heavy duty truck, off-road vehicles, material handling, agricultural, construction and other commercial vehicle end markets. Passenger car fuse products for internal combustion engine, hybrid and electric vehicles including blade fuses, battery cable protectors, resettable fuses, high-current fuses, and high-voltage fuses. Commercial vehicle products include fuses, switches, relays, and power distribution modules used in applications serving a number of end markets, including heavy truck, construction, agriculture and material handling. Automotive sensor products include a wide range of automotive and commercial vehicle products designed to monitor the passenger compartment occupant's safety and environment as well as the vehicle’s powertrain. • Industrial Segment: Consists of industrial circuit protection products (i.e. fuses, power distribution modules, switches) and industrial control products (i.e. relays, transformers, contactors, sensors). These products are used in a variety of applications and end-markets including: renewable energy, energy storage, HVAC, electric vehicle infrastructure, industrial equipment, industrial automation, construction, mining, and oil & gas. Segment information is summarized as follows: Three Months Ended Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Net sales Electronics $ 347,240 $ 255,349 $ 959,122 $ 692,809 Automotive 124,415 104,724 386,262 271,493 Industrial 67,926 31,493 181,479 80,697 Total net sales $ 539,581 $ 391,566 $ 1,526,863 $ 1,044,999 Depreciation and amortization Electronics $ 15,503 $ 15,819 $ 45,998 46,967 Automotive 7,075 7,370 21,094 21,628 Industrial 2,058 1,140 5,957 3,270 Total depreciation and amortization $ 24,636 $ 24,329 $ 73,049 $ 71,865 Operating income Electronics $ 100,524 $ 45,860 $ 230,283 $ 110,783 Automotive 15,806 15,383 55,380 20,642 Industrial 6,571 4,898 18,452 8,409 Other (a) (2,794) (1,583) (11,270) (42,476) Total operating income 120,107 64,558 292,845 97,358 Interest expense 4,602 4,988 13,901 16,261 Foreign exchange loss (gain) 3,154 (6,174) 8,315 (9,600) Other income, net (1,240) (1,682) (10,867) (1,643) Income before income taxes $ 113,591 $ 67,426 $ 281,496 $ 92,340 (a) Included in “Other” Operating income for the third quarter of 2021 was $6.8 million year-to-date of purchase accounting inventory step-up charges, $2.0 million ($3.4 million year-to-date) of legal and professional fees and other integration expenses related to Hartland and other contemplated acquisitions, and $0.8 million ($2.0 million year-to-date) of restructuring, impairment and other charges, primarily related to employee termination costs. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. In addition, there was a year-to-date gain of $0.9 million recorded for the sale of a building within the Electronics segment. Included in “Other” Operating income for the 2020 third quarter was $0.3 million ($1.6 million year-to-date) of acquisition-related and integration charges related to the IXYS acquisition and other contemplated acquisitions. In addition, there was $1.3 million ($40.9 million year-to-date) of restructuring, impairment and other charges, primarily related to employee termination costs of $1.2 million ($4.6 million year-to-date), and other restructuring charges of $0.1 million ($0.2 million year-to-date), the goodwill impairment charge of $33.8 million recorded in the second quarter associated with the automotive sensors reporting unit within the Automotive segment, impairment charges of $2.2 million recorded in the first quarter associated with the announced consolidation of a manufacturing facility within the Industrial segment. See Note 5, Goodwill and Other Intangible Assets and Note 7, Restructuring, Impairment, and Other Charges, for further discussion. The Company’s net sales by country were as follows: Three Months Ended Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Net sales United States $ 172,995 $ 106,121 $ 458,723 $ 285,901 China 160,628 126,506 455,872 314,547 Other countries (a) 205,958 158,939 612,268 444,551 Total net sales $ 539,581 $ 391,566 $ 1,526,863 $ 1,044,999 The Company’s long-lived assets by country were as follows: (in thousands) September 25, December 26, Long-lived assets United States $ 47,533 $ 46,132 China 90,984 85,876 Mexico 82,882 70,125 Germany 40,115 37,976 Philippines 68,594 66,994 Other countries (a) 34,221 37,075 Total long-lived assets $ 364,329 $ 344,178 The Company’s additions to long-lived assets by country were as follows: Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 Additions to long-lived assets United States $ 3,696 $ 2,712 China 13,790 6,414 Mexico 22,518 7,291 Germany 6,994 3,793 Philippines 10,109 15,331 Other countries (a) 3,527 1,152 Total additions to long-lived assets $ 60,634 $ 36,693 (a) Each country included in other countries is less than 10% of net sales.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 25, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent eventOn October 20, 2021, the Company announced that it had entered into a definitive agreement to acquire Carling Technologies, Inc. (“Carling”) for $315 million in cash, subject to a working capital adjustment. Founded in 1920, Carling has a leading position in switching and circuit protection technologies with a strong global presence in commercial vehicle, marine and datacom/telecom infrastructure markets. The business is headquartered in Plainville, Connecticut, with offices and facilities located around the world and will be reported as part of the commercial vehicle business within our Automotive segment. The transaction is subject to customary closing conditions and regulatory approvals, and is expected to close in the fourth quarter of 2021.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Other Information (Policies)	9 Months Ended
	Sep. 25, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Company’s accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheets, statements of net income and comprehensive income, statements of cash flows, and statement of stockholders' equity prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. They have been prepared in accordance with accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 26, 2020 which should be read in conjunction with the disclosures therein. In the opinion of management, all adjustments considered necessary for a fair presentation have been included and are of a normal, recurring nature. Operating results for interim periods are not necessarily indicative of annual operating results.
Revenue Recognition	Revenue Recognition The Company recognizes revenue on product sales in the period in which the Company satisfies its performance obligation and control of the product is transferred to the customer. The Company’s sales arrangements with customers are predominately short term in nature and generally provide for transfer of control at the time of shipment as this is the point at which title and risk of loss of the product transfers to the customer. At the end of each period, for those shipments where title to the products and the risk of loss and rewards of ownership do not transfer until the product has been received by the customer, the Company adjusts revenues and cost of sales for the delay between the time that the products are shipped and when they are received by the customer. The amount of revenue recorded reflects the consideration to which the Company expects to be entitled in exchange for goods and may include adjustments for customer allowance, rebates and price adjustments. The Company’s distribution channels are primarily through direct sales and independent third-party distributors. The Company elected the practical expedient under Accounting Standards Codification ("ASC") 340-40-25-4 to expense commissions when incurred as the amortization period of the commission asset the Company would have otherwise recognized is less than one year. Revenue and Billing The Company generally accepts orders from customers through receipt of purchase orders or electronic data interchange based on written sales agreements and purchasing contracts. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing is often negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is invoiced when the Company’s products are shipped to them in accordance with the terms of the sales agreement. As the Company’s standard payment terms are less than one year, the Company elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company also elected the practical expedient provided in ASC 606-10-25-18B to treat all product shipping and handling activities as fulfillment activities, and therefore recognize the gross revenue associated with the contract, inclusive of any shipping and handling revenue. Ship and Debit Program Some of the terms of the Company’s sales agreements and normal business conditions provide customers (distributors) the ability to receive price adjustments on products previously shipped and invoiced. This practice is common in the industry and is referred to as a “ship and debit” program. This program allows the distributor to debit the Company for the difference between the distributors’ contracted price and a lower price for specific transactions. Under certain circumstances (usually in a competitive situation or large volume opportunity), a distributor will request authorization for pricing allowances to reduce its price. When the Company approves such a reduction, the distributor is authorized to “debit” its account for the difference between the contracted price and the lower approved price. The Company establishes reserves for this program based on historic activity, electronic distributor inventory levels and actual authorizations for the debit and recognizes these debits as a reduction of revenue. Return to Stock The Company has a return to stock policy whereby certain customers, with prior authorization from Littelfuse management, can return previously purchased goods for full or partial credit. The Company establishes an estimated allowance for these returns based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated returns. Volume Rebates The Company offers volume based sales incentives to certain customers to encourage greater product sales. If customers achieve their specific quarterly or annual sales targets, they are entitled to rebates. The Company estimates the projected amount of rebates that will be achieved by the customer and recognizes this estimated cost as a reduction to revenue as products are sold.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update ("ASU") No. 2019-12, "Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes" as part of its initiative to reduce complexity in the accounting standards. The guidance is effective for fiscal years beginning after December 15, 2020 with early adoption permitted. The adoption of ASU 2019-12 did not have a material impact on our Condensed Consolidated Financial Statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies and Other Information (Tables)	9 Months Ended
	Sep. 25, 2021
Accounting Policies [Abstract]
Schedule of revenue disaggregation	The following tables disaggregate the Company’s revenue by primary business units for the three and nine months ended September 25, 2021 and September 26, 2020: Three Months Ended September 25, 2021 Nine Months Ended September 25, 2021 (in thousands) Electronics Automotive Industrial Electronics Automotive Industrial Electronics – Passive Products and Sensors $ 171,299 $ — $ — $ 171,299 $ 459,012 $ — $ — $ 459,012 Electronics – Semiconductor 175,941 — — 175,941 500,110 — — 500,110 Passenger Car Products — 64,630 — 64,630 — 200,579 — 200,579 Automotive Sensors — 24,112 — 24,112 — 79,081 — 79,081 Commercial Vehicle Products — 35,673 — 35,673 — 106,602 — 106,602 Industrial Products — — 67,926 67,926 — — 181,479 181,479 Total $ 347,240 $ 124,415 $ 67,926 $ 539,581 $ 959,122 $ 386,262 $ 181,479 $ 1,526,863 Three Months Ended September 26, 2020 Nine Months Ended September 26, 2020 (in thousands) Electronics Automotive Industrial Total Electronics Automotive Industrial Total Electronics – Passive Products and Sensors $ 108,253 $ — $ — $ 108,253 $ 285,697 $ — $ — $ 285,697 Electronics – Semiconductor 147,096 — — 147,096 407,112 — — 407,112 Passenger Car Products — 52,691 — 52,691 — 135,645 — 135,645 Automotive Sensors — 26,093 — 26,093 — 64,166 — 64,166 Commercial Vehicle Products — 25,940 — 25,940 — 71,682 — 71,682 Industrial Products — — 31,493 31,493 — — 80,697 80,697 Total $ 255,349 $ 104,724 $ 31,493 $ 391,566 $ 692,809 $ 271,493 $ 80,697 $ 1,044,999
Schedule of cash and cash equivalents	The following table provides a reconciliation of cash, cash equivalents and restricted cash at September 25, 2021 and December 26, 2020 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statement of Cash Flows. (in thousands) September 25, December 26, Cash and cash equivalents $ 690,682 $ 687,525 Restricted cash included in prepaid expenses and other current assets 3,483 — Restricted cash included in other assets 1,704 $ — Total cash, cash equivalents and restricted cash $ 695,869 $ 687,525
Schedule of restricted cash and cash equivalents	The following table provides a reconciliation of cash, cash equivalents and restricted cash at September 25, 2021 and December 26, 2020 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statement of Cash Flows. (in thousands) September 25, December 26, Cash and cash equivalents $ 690,682 $ 687,525 Restricted cash included in prepaid expenses and other current assets 3,483 — Restricted cash included in other assets 1,704 $ — Total cash, cash equivalents and restricted cash $ 695,869 $ 687,525

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 25, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of recognized identified assets acquired and liabilities assumed	The following table summarizes the final purchase price allocation of the fair value of assets acquired and liabilities assumed in the Hartland acquisition: (in thousands) Purchase Price Total purchase consideration: Cash, net of cash acquired, and restricted cash $ 109,852 Allocation of consideration to assets acquired and liabilities assumed: Trade receivables, net 13,027 Inventories 35,808 Other current assets 2,224 Property, plant, and equipment 6,296 Intangible assets 39,660 Goodwill 40,442 Other non-current assets 3,787 Current liabilities (24,846) Other non-current liabilities (6,546) $ 109,852
Summary of business acquisition, pro forma information	The following table summarizes, on an unaudited pro forma basis, the combined results of operations of the Company and Hartland as though the acquisition had occurred as of December 29, 2019. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the Hartland acquisition occurred as of December 29, 2019 or of future consolidated operating results. For the Three Months Ended For the Nine Months Ended (in thousands, except per share amounts) September 25, September 26, 2020 September 25, September 26, 2020 Net sales $ 539,581 $ 414,100 $ 1,533,901 $ 1,101,430 Income before income taxes 113,591 69,478 289,530 90,516 Net income 92,054 56,961 238,197 69,526 Net income per share — basic 3.74 2.34 9.69 2.85 Net income per share — diluted 3.69 2.32 9.56 2.83
Summary of business acquisition, pro forma information, nonrecurring adjustments	Pro forma results presented above primarily reflect the following adjustments: For the Three Months Ended For the Nine Months Ended (in thousands) September 25, September 26, 2020 September 25, 2021 September 26, 2020 Amortization (a) $ — $ (838) $ (280) $ (2,514) Depreciation — 44 7 139 Transaction costs (b) — — 835 (835) Amortization of inventory step-up (c) — — 6,808 (6,796) Income tax (expense) benefit of above items — 167 (1,555) 2,107 (a) The amortization adjustment for the three and nine months ended September 26, 2020 primarily reflects incremental amortization resulting from the measurement of intangibles at their fair values. (b) The transaction cost adjustments reflect the reversal of certain legal and professional fees from the nine months ended September 25, 2021 and recognition of those fees during the nine months ended September 26, 2020. (c) The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the nine months ended September 25, 2021 and the recognition of the amortization during the nine months ended September 26, 2020. The inventory step-up was amortized over four months as the inventory was sold.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 25, 2021
Inventory Disclosure [Abstract]
Schedule of inventory	The components of inventories at September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, 2021 December 26, 2020 Raw materials $ 121,282 $ 85,394 Work in process 109,347 92,783 Finished goods 161,567 114,641 Inventory Reserves (35,172) (34,816) Total $ 357,024 $ 258,002

Property, Plant, and Equipment

Property, Plant, and Equipment (Tables)	9 Months Ended
	Sep. 25, 2021
Property, Plant and Equipment [Abstract]
Schedule of components of net property, plant, and equipment	The components of net property, plant, and equipment at September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, 2021 December 26, 2020 Land $ 22,887 $ 22,851 Building 129,135 123,497 Equipment 725,971 678,220 Accumulated depreciation and amortization (513,664) (480,390) Total $ 364,329 $ 344,178

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 25, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill	The amounts for goodwill and changes in the carrying value by segment for the nine months ended September 25, 2021 are as follows: (in thousands) Electronics Automotive Industrial Total Net book value of goodwill as of December 26, 2020 Gross goodwill as of December 26, 2020 $ 676,325 $ 138,354 $ 47,551 $ 862,230 Accumulated impairment losses as of December 26, 2020 — (36,423) (8,995) (45,418) Total 676,325 101,931 38,556 816,812 Changes during 2021: Additions (a) — 1,614 40,442 42,056 Currency translation (9,530) (2,165) 32 (11,663) Net book value of goodwill as of September 25, 2021 Gross goodwill as of September 25, 2021 666,795 137,783 88,133 892,711 Accumulated impairment losses as of September 25, 2021 — (36,403) (9,103) (45,506) Total $ 666,795 $ 101,380 $ 79,030 $ 847,205
Schedule of finite-lived intangible assets	The components of other intangible assets as of September 25, 2021 and December 26, 2020 are as follows: As of September 25, 2021 (in thousands) Gross Accumulated Amortization Net Book Value Land use rights $ 10,354 $ 2,230 $ 8,124 Patents, licenses and software 142,606 99,834 42,772 Distribution network 43,601 40,306 3,295 Customer relationships, trademarks, and tradenames 399,655 158,080 241,575 Total $ 596,216 $ 300,450 $ 295,766 As of December 26, 2020 (in thousands) Gross Accumulated Amortization Net Book Value Land use rights $ 10,280 $ 2,007 $ 8,273 Patents, licenses and software 137,210 92,868 44,342 Distribution network 43,910 38,980 4,930 Customer relationships, trademarks, and tradenames 372,064 137,722 234,342 Total $ 563,464 $ 271,577 $ 291,887 During the nine months ended September 25, 2021, the Company recorded additions to intangible assets of $39.7 million, related to the Hartland acquisition, the components of which were as follows: (in thousands) Weighted Average Useful Life Amount Patents, licenses and software 9.2 $ 7,559 Customer relationships, trademarks, and tradenames 13.7 32,101 Total $ 39,660
Schedule of finite-lived intangible assets, future amortization expense	Estimated annual amortization expense related to intangible assets with definite lives as of September 25, 2021 is as follows: (in thousands) Amount 2021 $ 41,922 2022 40,761 2023 36,461 2024 33,038 2025 33,019 2026 and thereafter 142,173 Total $ 327,374

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	9 Months Ended
	Sep. 25, 2021
Payables and Accruals [Abstract]
Schedule of components of accrued liabilities	The components of accrued liabilities as of September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, 2021 December 26, 2020 Employee-related liabilities $ 80,034 $ 50,689 Operating lease liability 8,649 6,811 Other non-income taxes 5,352 2,126 Professional services 3,375 3,321 Restructuring liability 3,075 4,195 Interest 2,598 4,517 Deferred revenue 867 2,959 Customer liability 740 3,858 Other 34,980 32,002 Total $ 139,670 $ 110,478

Restructuring, Impairment and_2

Restructuring, Impairment and Other Charges (Tables)	9 Months Ended
	Sep. 25, 2021
Restructuring and Related Activities [Abstract]
Schedule of restructuring, impairment and other charges	The Company recorded restructuring, impairment and other charges for the three and nine months ended September 25, 2021 and September 26, 2020 as follows: Three months ended September 25, 2021 Nine months ended September 25, 2021 (in thousands) Electronics Automotive Industrial Total Electronics Automotive Industrial Total Employee terminations $ 542 $ — $ 133 $ 675 $ 1,094 $ 416 $ 302 $ 1,812 Other restructuring charges — 97 — 97 — 186 — 186 Total restructuring charges 542 97 133 772 1,094 602 302 1,998 Total $ 542 $ 97 $ 133 $ 772 $ 1,094 $ 602 $ 302 $ 1,998 Three months ended September 26, 2020 Nine months ended September 26, 2020 (in thousands) Electronics Automotive Industrial Total Electronics Automotive Industrial Total Employee terminations $ 388 $ 162 $ 648 $ 1,198 $ 2,125 $ 770 $ 1,719 $ 4,614 Other restructuring charges — — 79 79 — 108 104 212 Total restructuring charges 388 162 727 1,277 2,125 878 1,823 4,826 Impairment — — — — — 33,841 2,237 36,078 Total $ 388 $ 162 $ 727 $ 1,277 $ 2,125 $ 34,719 $ 4,060 $ 40,904

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 25, 2021
Debt Disclosure [Abstract]
Schedule of long-term debt instruments	The carrying amounts of debt at September 25, 2021 and December 26, 2020 are as follows: (in thousands) September 25, December 26, Revolving Credit Facility $ 100,000 $ 130,000 Euro Senior Notes, Series A due 2023 137,173 142,679 Euro Senior Notes, Series B due 2028 111,380 115,850 U.S. Senior Notes, Series A due 2022 25,000 25,000 U.S. Senior Notes, Series B due 2027 100,000 100,000 U.S. Senior Notes, Series A due 2025 50,000 50,000 U.S. Senior Notes, Series B due 2030 125,000 125,000 Other 2,619 2,619 Unamortized debt issuance costs (3,441) (4,114) Total debt 647,731 687,034 Less: Current maturities (27,619) — Total long-term debt $ 620,112 $ 687,034

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 25, 2021
Fair Value Disclosures [Abstract]
Schedule of fair value, assets measured on recurring basis	The following table presents assets measured at fair value by classification within the fair value hierarchy as of September 25, 2021: Fair Value Measurements Using (in thousands) Quoted Prices in Significant Significant Total Cash equivalents $ 15,970 $ — $ — $ 15,970 Investments in equity securities 27,358 — — 27,358 Mutual funds 14,711 — — 14,711 Total $ 58,039 $ — $ — $ 58,039 The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 26, 2020: Fair Value Measurements Using (in thousands) Quoted Prices in Significant Significant Total Cash equivalents $ 73,461 $ — $ — $ 73,461 Investments in equity securities 19,186 — — 19,186 Mutual funds 13,249 — — 13,249 Total $ 105,896 $ — $ — $ 105,896
Schedule of fair value, by balance sheet grouping	The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and USD Senior Notes, Series A and Series B, as of September 25, 2021 and December 26, 2020 were as follows: September 25, 2021 December 26, 2020 (in thousands) Carrying Estimated Carrying Estimated Euro Senior Notes, Series A due 2023 $ 137,173 $ 138,825 $ 142,679 $ 144,323 Euro Senior Notes, Series B due 2028 111,380 116,425 115,850 123,588 USD Senior Notes, Series A due 2022 25,000 25,167 25,000 25,437 USD Senior Notes, Series B due 2027 100,000 106,585 100,000 109,552 USD Senior Notes, Series A due 2025 50,000 52,567 50,000 53,474 USD Senior Notes, Series B due 2030 125,000 133,376 125,000 138,036

Benefit Plans (Tables)

Benefit Plans (Tables)	9 Months Ended
	Sep. 25, 2021
Retirement Benefits [Abstract]
Schedule of net benefit costs	The components of net periodic benefit cost for the three and nine months ended September 25, 2021 and September 26, 2020 were as follows: For the Three Months Ended For the Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Components of net periodic benefit cost: Service cost $ 684 $ 615 $ 2,086 $ 1,825 Interest cost 434 511 1,317 1,655 Expected return on plan assets (361) (422) (1,099) (1,551) Amortization of prior service and net actuarial loss 327 279 992 688 Net periodic benefit cost $ 1,084 $ 983 $ 3,296 $ 2,617

Other Comprehensive (Loss) In_2

Other Comprehensive (Loss) Income (Tables)	9 Months Ended
	Sep. 25, 2021
Equity [Abstract]
Schedule of components of comprehensive income (loss)	Changes in other comprehensive income (loss) by component were as follows: (in thousands) Three Months Ended Three Months Ended Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Defined benefit pension plan and other adjustments $ 601 $ 114 $ 487 $ 273 $ (290) $ 563 Foreign currency translation adjustments (5,441) — (5,441) 16,418 — 16,418 Total change in other comprehensive (loss) income $ (4,840) $ 114 $ (4,954) $ 16,691 $ (290) $ 16,981 (in thousands) Nine Months Ended Nine Months Ended Pre-tax Tax Net of Tax Pre-tax Tax Net of Tax Defined benefit pension plan adjustments $ 1,479 $ 209 $ 1,270 (12,270) (2,555) $ (9,715) Foreign currency translation adjustments (5,641) — (5,641) $ 9,300 $ — $ 9,300 Total change in other comprehensive (loss) income $ (4,162) $ 209 $ (4,371) $ (2,970) $ (2,555) $ (415)
Schedule of accumulated other comprehensive income (loss)	The following tables set forth the changes in accumulated other comprehensive (loss) by component for the nine months ended September 25, 2021 and September 26, 2020: (in thousands) Defined benefit pension plan and other adjustments Foreign currency Accumulated other Balance at December 26, 2020 $ (34,141) $ (57,016) $ (91,157) Activity in the period 1,270 (5,641) (4,371) Balance at September 25, 2021 $ (32,871) $ (62,657) $ (95,528) (in thousands) Defined benefit pension plan and other adjustments Foreign currency translation adjustment Accumulated other comprehensive (loss) Balance at December 28, 2019 $ (18,046) $ (88,777) $ (106,823) Activity in the period (9,715) 9,300 (415) Balance at September 26, 2020 $ (27,761) $ (79,477) $ (107,238)
Summary of reclassification out of accumulated other comprehensive income	Amounts reclassified from accumulated other comprehensive (loss) to earnings for the three and nine months ended September 25, 2021 and September 26, 2020 were as follows: Three Months Ended Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Pension and Postemployment plans: Amortization of prior service and net actuarial loss $ 501 $ 452 $ 1,514 $ 1,226

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 25, 2021
Earnings Per Share [Abstract]
Schedule of earnings per share, basic and diluted	The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended Nine Months Ended (in thousands, except per share amounts) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Numerator: Net income as reported $ 92,054 $ 55,356 $ 231,862 $ 71,009 Denominator: Weighted average shares outstanding Basic 24,622 24,357 24,582 24,354 Effect of dilutive securities 304 216 322 181 Diluted 24,926 24,573 24,904 24,535 Earnings Per Share: Basic earnings per share $ 3.74 $ 2.27 $ 9.43 $ 2.92 Diluted earnings per share $ 3.69 $ 2.25 $ 9.31 $ 2.89

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 25, 2021
Related Party Transactions [Abstract]
Schedule of related party transactions	For the Three Months Ended September 25, 2021 For the Three Months Ended September 26, 2020 (in millions) Powersem EB Tech ATEC Powersem EB Tech ATEC Sales to related party $ — $ — $ — $ 0.4 $ — $ — Purchase material/service from related party 0.8 0.1 3.1 0.8 — 2.4 For the Nine Months Ended September 25, 2021 For the Nine Months Ended September 26, 2020 (in millions) Powersem EB Tech ATEC Powersem EB Tech ATEC Sales to related party $ 0.2 $ — $ — $ 1.1 $ — $ — Purchase material/service from related party 2.6 0.3 8.9 1.8 — 5.8 September 25, 2021 December 26, 2020 (in millions) Powersem EB Tech ATEC Powersem EB Tech ATEC Accounts receivable balance $ — $ — $ — $ 0.1 $ — $ — Accounts payable balance 0.1 — 2.1 0.1 — 0.2

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 25, 2021
Segment Reporting [Abstract]
Schedule of segment reporting information, by segment	Segment information is summarized as follows: Three Months Ended Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Net sales Electronics $ 347,240 $ 255,349 $ 959,122 $ 692,809 Automotive 124,415 104,724 386,262 271,493 Industrial 67,926 31,493 181,479 80,697 Total net sales $ 539,581 $ 391,566 $ 1,526,863 $ 1,044,999 Depreciation and amortization Electronics $ 15,503 $ 15,819 $ 45,998 46,967 Automotive 7,075 7,370 21,094 21,628 Industrial 2,058 1,140 5,957 3,270 Total depreciation and amortization $ 24,636 $ 24,329 $ 73,049 $ 71,865 Operating income Electronics $ 100,524 $ 45,860 $ 230,283 $ 110,783 Automotive 15,806 15,383 55,380 20,642 Industrial 6,571 4,898 18,452 8,409 Other (a) (2,794) (1,583) (11,270) (42,476) Total operating income 120,107 64,558 292,845 97,358 Interest expense 4,602 4,988 13,901 16,261 Foreign exchange loss (gain) 3,154 (6,174) 8,315 (9,600) Other income, net (1,240) (1,682) (10,867) (1,643) Income before income taxes $ 113,591 $ 67,426 $ 281,496 $ 92,340 (a) Included in “Other” Operating income for the third quarter of 2021 was $6.8 million year-to-date of purchase accounting inventory step-up charges, $2.0 million ($3.4 million year-to-date) of legal and professional fees and other integration expenses related to Hartland and other contemplated acquisitions, and $0.8 million ($2.0 million year-to-date) of restructuring, impairment and other charges, primarily related to employee termination costs. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. In addition, there was a year-to-date gain of $0.9 million recorded for the sale of a building within the Electronics segment.
Schedule of disclosure on geographic areas, long-lived assets in individual foreign countries by country	The Company’s net sales by country were as follows: Three Months Ended Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 September 25, 2021 September 26, 2020 Net sales United States $ 172,995 $ 106,121 $ 458,723 $ 285,901 China 160,628 126,506 455,872 314,547 Other countries (a) 205,958 158,939 612,268 444,551 Total net sales $ 539,581 $ 391,566 $ 1,526,863 $ 1,044,999 The Company’s long-lived assets by country were as follows: (in thousands) September 25, December 26, Long-lived assets United States $ 47,533 $ 46,132 China 90,984 85,876 Mexico 82,882 70,125 Germany 40,115 37,976 Philippines 68,594 66,994 Other countries (a) 34,221 37,075 Total long-lived assets $ 364,329 $ 344,178 The Company’s additions to long-lived assets by country were as follows: Nine Months Ended (in thousands) September 25, 2021 September 26, 2020 Additions to long-lived assets United States $ 3,696 $ 2,712 China 13,790 6,414 Mexico 22,518 7,291 Germany 6,994 3,793 Philippines 10,109 15,331 Other countries (a) 3,527 1,152 Total additions to long-lived assets $ 60,634 $ 36,693 (a) Each country included in other countries is less than 10% of net sales.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies and Other Information (Details) customer in Thousands, associate in Thousands	9 Months Ended
	Sep. 25, 2021associatecountrycustomer
Accounting Policies [Abstract]
Countries where product is used (country) | country	15
Global associates (associate) | associate	12
Number of customers (over) | customer	100

Summary of Significant Accoun_5

Summary of Significant Accounting Policies and Other Information - Revenue Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Disaggregation of Revenue
Net sales	$ 539,581	$ 391,566	$ 1,526,863	$ 1,044,999
Electronics – Passive Products and Sensors
Disaggregation of Revenue
Net sales	171,299	108,253	459,012	285,697
Electronics – Semiconductor
Disaggregation of Revenue
Net sales	175,941	147,096	500,110	407,112
Passenger Car Products
Disaggregation of Revenue
Net sales	64,630	52,691	200,579	135,645
Automotive Sensors
Disaggregation of Revenue
Net sales	24,112	26,093	79,081	64,166
Commercial Vehicle Products
Disaggregation of Revenue
Net sales	35,673	25,940	106,602	71,682
Industrial Products
Disaggregation of Revenue
Net sales	67,926	31,493	181,479	80,697
Electronics Segment
Disaggregation of Revenue
Net sales	347,240	255,349	959,122	692,809
Electronics Segment | Electronics – Passive Products and Sensors
Disaggregation of Revenue
Net sales	171,299	108,253	459,012	285,697
Electronics Segment | Electronics – Semiconductor
Disaggregation of Revenue
Net sales	175,941	147,096	500,110	407,112
Automotive Segment
Disaggregation of Revenue
Net sales	124,415	104,724	386,262	271,493
Automotive Segment | Passenger Car Products
Disaggregation of Revenue
Net sales	64,630	52,691	200,579	135,645
Automotive Segment | Automotive Sensors
Disaggregation of Revenue
Net sales	24,112	26,093	79,081	64,166
Automotive Segment | Commercial Vehicle Products
Disaggregation of Revenue
Net sales	35,673	25,940	106,602	71,682
Industrial Segment
Disaggregation of Revenue
Net sales	67,926	31,493	181,479	80,697
Industrial Segment | Industrial Products
Disaggregation of Revenue
Net sales	$ 67,926	$ 31,493	$ 181,479	$ 80,697

Summary of Significant Accoun_6

Summary of Significant Accounting Policies and Other Information - Cash and cash equivalents (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020	Sep. 26, 2020	Dec. 28, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 690,682	$ 687,525	$ 641,890
Restricted cash included in prepaid expenses and other current assets	3,483	0	0
Restricted cash included in other assets	1,704	0	0
Total cash, cash equivalents and restricted cash	$ 695,869	$ 687,525	$ 641,890	$ 531,139

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Jan. 28, 2021	Sep. 25, 2021	Sep. 25, 2021	Sep. 26, 2020
Business Acquisition
Cash, net of cash acquired, and restricted cash			$ 110,646	$ 0
Restricted cash		$ 1,700	1,700
Acquisition related costs			$ 800
Inventory amortization period (in years)			4 months
Hartland Controls
Business Acquisition
Annualized sales	$ 70,000
Hartland Controls
Business Acquisition
Cash acquired from acquisition	112,300
Cash, net of cash acquired, and restricted cash	109,852
Net sales		29,300	$ 72,300
Income (loss) before income taxes		$ 1,200	(1,300)
Inventory adjustment	$ 6,800
Hartland Controls | Corporate Non-Segment | Operating Income (Loss)
Business Acquisition
Inventory adjustment			$ 6,800

Acquisitions - Preliminary Pric

Acquisitions - Preliminary Price Allocation (Details) - USD ($) $ in Thousands	Jan. 28, 2021	Sep. 25, 2021	Sep. 26, 2020	Dec. 26, 2020
Total purchase consideration:
Cash, net of cash acquired, and restricted cash		$ 110,646	$ 0
Allocation of consideration to assets acquired and liabilities assumed:
Goodwill		$ 847,205		$ 816,812
Hartland Controls
Total purchase consideration:
Cash, net of cash acquired, and restricted cash	$ 109,852
Allocation of consideration to assets acquired and liabilities assumed:
Trade receivables, net	13,027
Inventories	35,808
Other current assets	2,224
Property, plant, and equipment	6,296
Intangible assets	39,660
Goodwill	40,442
Other non-current assets	3,787
Current liabilities	(24,846)
Other non-current liabilities	(6,546)
Assets acquired and liabilities assumed	$ 109,852

Acquisitions - Business Acquisi

Acquisitions - Business Acquisition Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Business Combination and Asset Acquisition [Abstract]
Net sales	$ 539,581	$ 414,100	$ 1,533,901	$ 1,101,430
Income before income taxes	113,591	69,478	289,530	90,516
Net income	$ 92,054	$ 56,961	$ 238,197	$ 69,526
Net income per share — basic (in dollars per share)	$ 3.74	$ 2.34	$ 9.69	$ 2.85
Net income per share — diluted (in dollars per share)	$ 3.69	$ 2.32	$ 9.56	$ 2.83

Acquisitions - Pro Forma Inform

Acquisitions - Pro Forma Information Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income	$ 92,054	$ 56,961	$ 238,197	$ 69,526
Amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income	0	(838)	(280)	(2,514)
Depreciation
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income	0	44	7	139
Transaction costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income	0	0	835	(835)
Amortization of inventory step-up
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income	0	0	6,808	(6,796)
Income tax (expense) benefit of above items
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income	$ 0	$ 167	$ (1,555)	$ 2,107

Inventories - Components of Inv

Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 121,282	$ 85,394
Work in process	109,347	92,783
Finished goods	161,567	114,641
Inventory Reserves	(35,172)	(34,816)
Total	$ 357,024	$ 258,002

Property, Plant, and Equipmen_2

Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Property, Plant and Equipment
Accumulated depreciation and amortization	$ (513,664)	$ (480,390)
Total	364,329	344,178
Land
Property, Plant and Equipment
Property, plant, and equipment, gross	22,887	22,851
Building
Property, Plant and Equipment
Property, plant, and equipment, gross	129,135	123,497
Equipment
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 725,971	$ 678,220

Property, Plant, and Equipmen_3

Property, Plant, and Equipment - Depreciation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Property, Plant and Equipment [Abstract]
Depreciation	$ 14,200	$ 14,200	$ 41,441	$ 41,953

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Amounts for Goodwill and Changes in Carrying Value by Operating Segment (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2021	Dec. 26, 2020
Goodwill
Gross goodwill	$ 892,711	$ 862,230
Accumulated impairment losses	(45,506)	(45,418)
Net goodwill	847,205	816,812
Additions	42,056
Currency translation	(11,663)
Electronics
Goodwill
Gross goodwill	666,795	676,325
Accumulated impairment losses	0	0
Net goodwill	666,795	676,325
Additions	0
Currency translation	(9,530)
Automotive
Goodwill
Gross goodwill	137,783	138,354
Accumulated impairment losses	(36,403)	(36,423)
Net goodwill	101,380	101,931
Additions	1,614
Currency translation	(2,165)
Industrial
Goodwill
Gross goodwill	88,133	47,551
Accumulated impairment losses	(9,103)	(8,995)
Net goodwill	79,030	$ 38,556
Additions	40,442
Currency translation	$ 32

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 25, 2021	Sep. 26, 2020	Jan. 28, 2021	Dec. 26, 2020
Goodwill
Goodwill	$ 847,205				$ 847,205			$ 816,812
Amortization of intangibles	10,446	$ 10,104			31,608	$ 29,912
Impairment of intangibles				$ 300
Acquired finite lived intangibles					42,056
Automotive Sensors
Goodwill
Goodwill impairment charge			$ 33,800
Goodwill	$ 9,500				9,500
Hartland Controls
Goodwill
Goodwill							$ 40,442
Acquired finite lived intangibles					$ 39,700

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Details of Other Intangible Assets and Related Future Amortization Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2021	Dec. 26, 2020
Finite-Lived Intangible Assets
Gross Carrying Value	$ 596,216	$ 563,464
Accumulated Amortization	300,450	271,577
Net Book Value	295,766	291,887
Amount	39,660
Land use rights
Finite-Lived Intangible Assets
Gross Carrying Value	10,354	10,280
Accumulated Amortization	2,230	2,007
Net Book Value	8,124	8,273
Patents, licenses and software
Finite-Lived Intangible Assets
Gross Carrying Value	142,606	137,210
Accumulated Amortization	99,834	92,868
Net Book Value	$ 42,772	44,342
Weighted Average Useful Life	9 years 2 months 12 days
Amount	$ 7,559
Distribution network
Finite-Lived Intangible Assets
Gross Carrying Value	43,601	43,910
Accumulated Amortization	40,306	38,980
Net Book Value	3,295	4,930
Customer relationships, trademarks, and tradenames
Finite-Lived Intangible Assets
Gross Carrying Value	399,655	372,064
Accumulated Amortization	158,080	137,722
Net Book Value	$ 241,575	$ 234,342
Weighted Average Useful Life	13 years 8 months 12 days
Amount	$ 32,101

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Intangible Assets with Definite Lives (Details) $ in Thousands	Sep. 25, 2021USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2021	$ 41,922
2022	40,761
2023	36,461
2024	33,038
2025	33,019
2026 and thereafter	142,173
Total	$ 327,374

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Payables and Accruals [Abstract]
Employee-related liabilities	$ 80,034	$ 50,689
Operating lease liability	8,649	6,811
Other non-income taxes	5,352	2,126
Professional services	3,375	3,321
Restructuring liability	3,075	4,195
Interest	2,598	4,517
Deferred revenue	867	2,959
Customer liability	740	3,858
Other	34,980	32,002
Total	$ 139,670	$ 110,478

Restructuring, Impairment and_3

Restructuring, Impairment and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Jun. 27, 2020	Sep. 25, 2021	Sep. 26, 2020	Dec. 26, 2020
Restructuring Cost and Reserve
Total restructuring charges	$ 772	$ 1,277		$ 1,998	$ 4,826
Impairment charges		0		0	36,078
Restructuring costs	772	1,277		1,998	40,904
Restructuring reserves	3,100			3,100		$ 4,200
Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	675	1,198		1,812	4,614
Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	97	79		186	212
Electronics
Restructuring Cost and Reserve
Total restructuring charges	542	388		1,094	2,125
Impairment charges		0			0
Restructuring costs	542	388		1,094	2,125
Electronics | Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	542	388		1,094	2,125
Electronics | Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	0	0		0	0
Automotive
Restructuring Cost and Reserve
Total restructuring charges	97	162		602	878
Impairment charges		0			33,841
Restructuring costs	97	162		602	34,719
Automotive | Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	0	162		416	770
Automotive | Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	97	0		186	108
Automotive | Facility Closing
Restructuring Cost and Reserve
Goodwill impairment charge			$ 33,800
Industrial
Restructuring Cost and Reserve
Total restructuring charges	133	727		302	1,823
Impairment charges		0			2,237
Restructuring costs	133	727		302	4,060
Industrial | Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	133	648		302	1,719
Industrial | Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	$ 0	$ 79		$ 0	$ 104
Industrial | Facility Closing
Restructuring Cost and Reserve
Impairment charges			$ 2,200

Debt - Carrying Amounts of Long

Debt - Carrying Amounts of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Debt Instrument
Unamortized debt issuance costs	$ (3,441)	$ (4,114)
Total debt	647,731	687,034
Less: Current maturities	(27,619)	0
Total long-term debt	620,112	687,034
Revolving Credit Facility
Debt Instrument
Long-term debt, gross	100,000	130,000
Senior Notes | Euro Senior Notes, Series A due 2023
Debt Instrument
Long-term debt, gross	137,173	142,679
Senior Notes | Euro Senior Notes, Series B due 2028
Debt Instrument
Long-term debt, gross	111,380	115,850
Senior Notes | U.S. Senior Notes, Series A due 2022
Debt Instrument
Long-term debt, gross	25,000	25,000
Senior Notes | U.S. Senior Notes, Series B due 2027
Debt Instrument
Long-term debt, gross	100,000	100,000
Senior Notes | U.S. Senior Notes, Series A due 2025
Debt Instrument
Long-term debt, gross	50,000	50,000
Senior Notes | U.S. Senior Notes, Series B due 2030
Debt Instrument
Long-term debt, gross	125,000	125,000
Other
Debt Instrument
Long-term debt, gross	$ 2,619	$ 2,619

Debt - Narrative (Details)

Debt - Narrative (Details)

Apr. 03, 2020USD ($)

Sep. 25, 2021USD ($)

Sep. 26, 2020USD ($)

Sep. 25, 2021USD ($)

Sep. 26, 2020USD ($)

Dec. 26, 2020USD ($)

Apr. 02, 2020USD ($)

Jan. 16, 2018USD ($)

Nov. 15, 2017USD ($)series

Feb. 15, 2017USD ($)

Dec. 08, 2016USD ($)series

Dec. 08, 2016EUR (€)series

Debt Instrument

Payments of revolving credit facility

$ 30,000,000

$ 60,000,000

Cash paid interest during the period

$ 6,100,000

$ 6,400,000

$ 14,830,000

$ 17,228,000

Credit Agreement

Debt Instrument

Effective interest rate (percent)

1.33%

1.33%

Letter of credit outstanding (less than)

$ 0

$ 0

Credit Agreement | Minimum

Debt Instrument

Commitment fee (percent)

0.125%

Credit Agreement | Maximum

Debt Instrument

Commitment fee (percent)

0.20%

Credit Agreement | LIBOR | Minimum

Debt Instrument

Basis spread on variable rate (percent)

1.25%

Credit Agreement | LIBOR | Maximum

Debt Instrument

Basis spread on variable rate (percent)

2.00%

Credit Agreement | Base Rate | Minimum

Debt Instrument

Basis spread on variable rate (percent)

0.25%

Credit Agreement | Base Rate | Maximum

Debt Instrument

Basis spread on variable rate (percent)

1.00%

Credit Agreement | Revolving Credit Facility

Debt Instrument

Remaining borrowing capacity

600,000,000

$ 600,000,000

Term Loan

Debt Instrument

Elimination of unsecured team loan facility

$ 200,000,000

Long-term debt, gross

$ 140,000,000

Senior Notes | Euro Senior Notes, Series A and B

Debt Instrument

Face amount of debt | €

€ 212,000,000

Number of series | series

2

2

Senior Notes | Euro Senior Notes, Series A due 2023

Debt Instrument

Long-term debt, gross

137,173,000

137,173,000

$ 142,679,000

Face amount of debt | €

€ 117,000,000

Stated interest rate (percent)

1.14%

1.14%

Senior Notes | Euro Senior Notes, Series B due 2028

Debt Instrument

Long-term debt, gross

111,380,000

111,380,000

115,850,000

Face amount of debt | €

€ 95,000,000

Stated interest rate (percent)

1.83%

1.83%

Senior Notes | U.S. Senior Notes, Series A and B

Debt Instrument

Face amount of debt

$ 125,000,000

Number of series | series

2

2

Senior Notes | U.S. Senior Notes, Series A

Debt Instrument

Face amount of debt

$ 25,000,000

Stated interest rate (percent)

3.03%

Senior Notes | U.S. Senior Notes, Series B

Debt Instrument

Face amount of debt

$ 100,000,000

Stated interest rate (percent)

3.74%

Senior Notes | US Senior Notes A and B Due 2025 and 2030

Debt Instrument

Face amount of debt

$ 175,000,000

Number of series | series

2

Senior Notes | U.S. Senior Notes, Series A due 2025

Debt Instrument

Long-term debt, gross

50,000,000

50,000,000

50,000,000

Face amount of debt

$ 50,000,000

Stated interest rate (percent)

3.48%

Senior Notes | U.S. Senior Notes, Series B due 2030

Debt Instrument

Long-term debt, gross

$ 125,000,000

$ 125,000,000

$ 125,000,000

Face amount of debt

$ 125,000,000

Stated interest rate (percent)

3.78%

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Mar. 28, 2020	Sep. 25, 2021	Sep. 26, 2020	Dec. 26, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Impairment of investments	$ 500	$ 100		$ 500	$ 100
Investments in equity securities	$ 27,358			$ 27,358		$ 19,186
Patents
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other asset impairment charges			$ 300
Land and Building
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other asset impairment charges			$ 1,900
Other Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Investments in equity securities						$ 500

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities - Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 15,970	$ 73,461
Investments in equity securities	27,358	19,186
Mutual funds	14,711	13,249
Total	58,039	105,896
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	15,970	73,461
Investments in equity securities	27,358	19,186
Mutual funds	14,711	13,249
Total	58,039	105,896
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Investments in equity securities	0	0
Mutual funds	0	0
Total	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Investments in equity securities	0	0
Mutual funds	0	0
Total	$ 0	$ 0

Fair Value of Assets and Liab_5

Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value of Senior Notes (Details) - Senior Notes - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Carrying Value | Euro Senior Notes, Series A due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	$ 137,173	$ 142,679
Carrying Value | Euro Senior Notes, Series B due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	111,380	115,850
Carrying Value | U.S. Senior Notes, Series A due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	25,000	25,000
Carrying Value | U.S. Senior Notes, Series B due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	100,000	100,000
Carrying Value | U.S. Senior Notes, Series A due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	50,000	50,000
Carrying Value | U.S. Senior Notes, Series B due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	125,000	125,000
Estimated Fair Value | Euro Senior Notes, Series A due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	138,825	144,323
Estimated Fair Value | Euro Senior Notes, Series B due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	116,425	123,588
Estimated Fair Value | U.S. Senior Notes, Series A due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	25,167	25,437
Estimated Fair Value | U.S. Senior Notes, Series B due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	106,585	109,552
Estimated Fair Value | U.S. Senior Notes, Series A due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	52,567	53,474
Estimated Fair Value | U.S. Senior Notes, Series B due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	$ 133,376	$ 138,036

Benefit Plans - Benefit Plan Ex

Benefit Plans - Benefit Plan Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Retirement Benefits [Abstract]
Service cost	$ 684	$ 615	$ 2,086	$ 1,825
Interest cost	434	511	1,317	1,655
Expected return on plan assets	(361)	(422)	(1,099)	(1,551)
Amortization of prior service and net actuarial loss	327	279	992	688
Net periodic benefit cost	$ 1,084	$ 983	$ 3,296	$ 2,617

Benefit Plans - Narrative (Deta

Benefit Plans - Narrative (Details) $ in Thousands, £ in Millions	Apr. 06, 2020USD ($)	Apr. 06, 2020GBP (£)	Dec. 31, 2021USD ($)	Sep. 25, 2021USD ($)	Sep. 26, 2020USD ($)	Jun. 27, 2020USD ($)	Jun. 27, 2020GBP (£)	Sep. 25, 2021USD ($)	Sep. 26, 2020USD ($)	Apr. 07, 2020USD ($)
Defined Benefit Plan Disclosure
Contributions expected				$ 2,200				$ 2,200
Expected direct payments				3,800				3,800
Defined benefit plan expense				1,084	$ 983			3,296	$ 2,617
Estimated decrease in pension cost										$ 55,000
Estimated percent reduction in pension costs										37.00%
Benefit obligation, unamortized actuarial loss	$ (13,400)	£ 13.4
Cash contribution						$ 10,400	£ 8.4
Defined benefit pension plan and other adjustments
Defined Benefit Plan Disclosure
Benefit obligation, unamortized actuarial loss | £		£ 10.9
Forecast | Minimum
Defined Benefit Plan Disclosure
Estimated settlement charge			$ 18,000
Forecast | Maximum
Defined Benefit Plan Disclosure
Estimated settlement charge			$ 22,000
Foreign Plan
Defined Benefit Plan Disclosure
Defined benefit plan expense				600	500			1,600	1,500
Other comprehensive income as component of net period benefit cost, before tax				$ 200	$ 200			$ 500	$ 500

Other Comprehensive (Loss) In_3

Other Comprehensive (Loss) Income - Schedule of Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 25, 2021	Sep. 26, 2020
Other Comprehensive Income (Loss)
Pre-tax	$ (4,840)			$ 16,691			$ (4,162)	$ (2,970)
Tax	114			(290)			209	(2,555)
Total change in other comprehensive (loss) income	(4,954)	$ 5,454	$ (4,871)	16,981	$ (2,417)	$ (14,979)	(4,371)	(415)
Defined benefit pension plan and other adjustments
Other Comprehensive Income (Loss)
Pre-tax	601			273			1,479	(12,270)
Tax	114			(290)			209	(2,555)
Total change in other comprehensive (loss) income	487			563			1,270	(9,715)
Foreign currency translation adjustment
Other Comprehensive Income (Loss)
Pre-tax	(5,441)			16,418			(5,641)	9,300
Tax	0			0			0	0
Total change in other comprehensive (loss) income	$ (5,441)			$ 16,418			$ (5,641)	$ 9,300

Other Comprehensive (Loss) In_4

Other Comprehensive (Loss) Income - Narrative (Details) - Apr. 06, 2020 £ in Millions, $ in Millions	GBP (£)	USD ($)
Equity [Abstract]
Benefit obligation, unamortized actuarial loss	£ (13.4)	$ 13.4

Other Comprehensive (Loss) In_5

Other Comprehensive (Loss) Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 25, 2021	Sep. 26, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	$ 1,742,220	$ 1,660,737	$ 1,608,773	$ 1,462,434	$ 1,476,948	$ 1,496,014	$ 1,608,773	$ 1,496,014
Other comprehensive loss, net of tax	(4,954)	5,454	(4,871)	16,981	(2,417)	(14,979)	(4,371)	(415)
Balance	1,821,398	1,742,220	1,660,737	1,529,562	1,462,434	1,476,948	1,821,398	1,529,562
Accumulated other comprehensive (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	(90,574)	(96,028)	(91,157)	(124,219)	(121,802)	(106,823)	(91,157)	(106,823)
Other comprehensive loss, net of tax	(4,954)	5,454	(4,871)	16,981	(2,417)	(14,979)
Balance	(95,528)	$ (90,574)	(96,028)	(107,238)	$ (124,219)	(121,802)	(95,528)	(107,238)
Defined benefit pension plan and other adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance			(34,141)			(18,046)	(34,141)	(18,046)
Other comprehensive loss, net of tax	487			563			1,270	(9,715)
Balance	(32,871)			(27,761)			(32,871)	(27,761)
Foreign currency translation adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance			$ (57,016)			$ (88,777)	(57,016)	(88,777)
Other comprehensive loss, net of tax	(5,441)			16,418			(5,641)	9,300
Balance	$ (62,657)			$ (79,477)			$ (62,657)	$ (79,477)

Other Comprehensive (Loss) In_6

Other Comprehensive (Loss) Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Amortization of prior service and net actuarial loss | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Amortization of prior service and net actuarial loss	$ 501	$ 452	$ 1,514	$ 1,226

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Jun. 27, 2020	Sep. 25, 2021	Sep. 26, 2020
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	19.00%	17.90%		17.60%	23.10%
Facility Closing | Automotive
Income Tax
Goodwill impairment charge			$ 33.8

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 25, 2021	Sep. 26, 2020
Numerator:
Net income as reported	$ 92,054	$ 82,095	$ 57,713	$ 55,356	$ (8,991)	$ 24,644	$ 231,862	$ 71,009
Weighted average shares outstanding
Basic (in shares)	24,622			24,357			24,582	24,354
Effect of dilutive securities (in shares)	304			216			322	181
Diluted (in shares)	24,926			24,573			24,904	24,535
Earnings Per Share:
Basic earnings per share (in dollars per share)	$ 3.74			$ 2.27			$ 9.43	$ 2.92
Diluted earnings per share (in dollars per share)	$ 3.69			$ 2.25			$ 9.31	$ 2.89

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Mar. 28, 2020	Sep. 25, 2021	Sep. 26, 2020	Apr. 28, 2021	Apr. 29, 2020	Apr. 26, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded (in shares)	57,936	290,262		32,773	194,857
Shares repurchased (in shares)	0			0	175,110
Repurchases of common stock			$ 22,927		$ 22,900
2019 Share Repurchase Program
Antidilutive Securities Excluded from Computation of Earnings Per Share
Repurchase authorized (in shares)								1,000,000
2020 Share Repurchase Program
Antidilutive Securities Excluded from Computation of Earnings Per Share
Repurchase authorized (in shares)						300,000,000	1,000,000

Related Party Transactions (Det

Related Party Transactions (Details) - Equity Method Investee - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020	Dec. 26, 2020
Powersem
Related Party Transaction
Ownership percentage (percent)	45.00%		45.00%
Sales to related party	$ 0	$ 0.4	$ 0.2	$ 1.1
Purchase material/service from related party	0.8	0.8	2.6	1.8
Accounts receivable balance	0		0		$ 0.1
Accounts payable balance	$ 0.1		$ 0.1		0.1
EB Tech
Related Party Transaction
Ownership percentage (percent)	19.00%		19.00%
Sales to related party	$ 0	0	$ 0	0
Purchase material/service from related party	0.1	0	0.3	0
Accounts receivable balance	0		0		0
Accounts payable balance	$ 0		$ 0		0
ATEC
Related Party Transaction
Ownership percentage (percent)	24.00%		24.00%
Sales to related party	$ 0	0	$ 0	0
Purchase material/service from related party	3.1	$ 2.4	8.9	$ 5.8
Accounts receivable balance	0		0		0
Accounts payable balance	$ 2.1		$ 2.1		$ 0.2

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Segment Reporting Information
Net sales	$ 539,581	$ 391,566	$ 1,526,863	$ 1,044,999
Depreciation and amortization	24,636	24,329	73,049	71,865
Operating income	120,107	64,558	292,845	97,358
Interest expense	4,602	4,988	13,901	16,261
Foreign exchange loss (gain)	3,154	(6,174)	8,315	(9,600)
Other income, net	(1,240)	(1,682)	(10,867)	(1,643)
Income before income taxes	113,591	67,426	281,496	92,340
Electronics
Segment Reporting Information
Net sales	347,240	255,349	959,122	692,809
Depreciation and amortization	15,503	15,819	45,998	46,967
Electronics | Operating Segments
Segment Reporting Information
Operating income	100,524	45,860	230,283	110,783
Automotive
Segment Reporting Information
Net sales	124,415	104,724	386,262	271,493
Depreciation and amortization	7,075	7,370	21,094	21,628
Automotive | Operating Segments
Segment Reporting Information
Operating income	15,806	15,383	55,380	20,642
Industrial
Segment Reporting Information
Net sales	67,926	31,493	181,479	80,697
Depreciation and amortization	2,058	1,140	5,957	3,270
Industrial | Operating Segments
Segment Reporting Information
Operating income	6,571	4,898	18,452	8,409
Other | Corporate Non-Segment
Segment Reporting Information
Operating income	$ (2,794)	$ (1,583)	$ (11,270)	$ (42,476)

Segment Information - Narrative

Segment Information - Narrative (Details) $ in Thousands	Jan. 28, 2021USD ($)	Sep. 25, 2021USD ($)	Sep. 26, 2020USD ($)	Jun. 27, 2020USD ($)	Mar. 28, 2020USD ($)	Sep. 25, 2021USD ($)segment	Sep. 26, 2020USD ($)
Segment Reporting Information
Number of operating segments | segment						3
Acquisition related costs						$ 800
Restructuring charges		$ 772	$ 1,277			1,998	$ 4,826
Hartland Controls
Segment Reporting Information
Inventory adjustment	$ 6,800
IXYS
Segment Reporting Information
Restructuring charges			1,300				40,900
Operating Income (Loss) | IXYS
Segment Reporting Information
Acquisition related Costs and integration costs			300				1,600
Operating Income (Loss) | Corporate Non-Segment | Hartland Controls
Segment Reporting Information
Inventory adjustment						6,800
Other | Operating Income (Loss) | Hartland Controls
Segment Reporting Information
Acquisition related costs		2,000				3,400
Restructuring charges		800				2,000
Industrial
Segment Reporting Information
Restructuring charges		133	727			302	1,823
Electronics
Segment Reporting Information
Restructuring charges		542	388			1,094	2,125
Electronics | Hartland Controls
Segment Reporting Information
Gain (loss) on sale of properties						900
Automotive
Segment Reporting Information
Restructuring charges		97	162			602	878
Automotive | Senor Reporting Unit
Segment Reporting Information
Goodwill impairment charge			33,800
Automotive | IXYS
Segment Reporting Information
Other asset impairment charges					$ 2,200
Employee terminations
Segment Reporting Information
Restructuring charges		675	1,198			1,812	4,614
Employee terminations | IXYS
Segment Reporting Information
Restructuring charges			1,200				4,600
Employee terminations | Industrial
Segment Reporting Information
Restructuring charges		133	648			302	1,719
Employee terminations | Electronics
Segment Reporting Information
Restructuring charges		542	388			1,094	2,125
Employee terminations | Automotive
Segment Reporting Information
Restructuring charges		0	162			416	770
Facility Closing | Automotive
Segment Reporting Information
Goodwill impairment charge				$ 33,800
Other restructuring charges
Segment Reporting Information
Restructuring charges		97	79			186	212
Other restructuring charges | IXYS
Segment Reporting Information
Restructuring charges			100				200
Other restructuring charges | Industrial
Segment Reporting Information
Restructuring charges		0	79			0	104
Other restructuring charges | Electronics
Segment Reporting Information
Restructuring charges		0	0			0	0
Other restructuring charges | Automotive
Segment Reporting Information
Restructuring charges		$ 97	$ 0			$ 186	$ 108

Segment Information - Revenues

Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020	Dec. 26, 2020
Segment Reporting Information
Net sales	$ 539,581	$ 391,566	$ 1,526,863	$ 1,044,999
Long-lived assets	364,329		364,329		$ 344,178
Additions to long-lived assets			60,634	36,693
United States
Segment Reporting Information
Net sales	172,995	106,121	458,723	285,901
Long-lived assets	47,533		47,533		46,132
Additions to long-lived assets			3,696	2,712
China
Segment Reporting Information
Net sales	160,628	126,506	455,872	314,547
Long-lived assets	90,984		90,984		85,876
Additions to long-lived assets			13,790	6,414
Mexico
Segment Reporting Information
Long-lived assets	82,882		82,882		70,125
Additions to long-lived assets			22,518	7,291
Germany
Segment Reporting Information
Long-lived assets	40,115		40,115		37,976
Additions to long-lived assets			6,994	3,793
Philippines
Segment Reporting Information
Long-lived assets	68,594		68,594		66,994
Additions to long-lived assets			10,109	15,331
Other countries
Segment Reporting Information
Net sales	205,958	$ 158,939	612,268	444,551
Long-lived assets	$ 34,221		34,221		$ 37,075
Additions to long-lived assets			$ 3,527	$ 1,152

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Oct. 20, 2021USD ($)
Subsequent Event | Carling Technologies, Inc. | Scenario, Plan
Subsequent Event [Line Items]
Cash	$ 315