Littelfuse (LFUS) 10-K 23 Feb 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 30, 2017	Feb. 16, 2018	Jul. 01, 2017
Document Information [Line Items]
Entity Registrant Name	LITTELFUSE INC /DE
Entity Central Index Key	889,331
Trading Symbol	lfus
Current Fiscal Year End Date	--12-30
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding (in shares)		24,830,204
Entity Public Float			$ 3,736,767,705
Document Type	10-K
Document Period End Date	Dec. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 429,676	$ 275,124
Short-term investments	35	3,690
Trade receivables, less allowances (2017 - $27,516; 2016 - $25,874)	182,699	176,032
Inventories	140,789	114,063
Prepaid income taxes and income taxes receivable	1,689	11,671
Prepaid expenses and other current assets	37,452	31,501
Total current assets	792,340	612,081
Property, plant, and equipment:
Land	9,547	9,268
Buildings	86,599	80,553
Equipment	505,838	439,542
Accumulated depreciation and amortization	(351,407)	(312,188)
Net property, plant, and equipment	250,577	217,175
Intangible assets, net of amortization	203,850	213,027
Goodwill	453,414	403,544
Investments	10,993	13,933
Deferred income taxes	11,858	20,585
Other assets	17,070	10,849
Total assets	1,740,102	1,491,194
Current liabilities:
Accounts payable	101,844	90,712
Accrued payroll	49,962	42,810
Accrued expenses	48,994	36,138
Accrued severance	1,459	2,785
Accrued income taxes	16,285	8,846
Current portion of long-term debt	6,250	6,250
Total current liabilities	224,794	187,541
Long-term debt, less current portion	489,361	447,892
Deferred income taxes	(17,069)	(7,066)
Accrued post-retirement benefits	18,742	13,398
Other long-term liabilities	62,580	20,366
Shareholders’ equity:
Common stock, par value $0.01 per share: 34,000,000 shares authorized; shares issued, 2017 –22,713,198; 2016 –22,626,922	229	228
Treasury stock, at cost: 439,598 and 409,115 shares, respectively	(41,294)	(36,510)
Additional paid-in capital	310,012	291,258
Accumulated other comprehensive income	(63,668)	(74,579)
Retained earnings	722,140	634,391
Littelfuse, Inc. shareholders’ equity	927,419	814,788
Non-controlling interest	137	143
Total equity	927,556	814,931
Total liabilities and equity	$ 1,740,102	$ 1,491,194

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Trade receivables, allowances	$ 27,516	$ 25,874
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	34,000,000	34,000,000
Common stock, shares issued (in shares)	22,713,198	22,626,922
Common stock, shares outstanding (in shares)	22,713,198	22,626,922
Treasury stock, shares (in shares)	439,598	409,115

Consolidated Statements of Net

Consolidated Statements of Net Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Net sales	$ 1,221,534	$ 1,056,159	$ 867,864
Cost of sales	715,001	643,042	537,365
Gross profit	506,533	413,117	330,499
Selling, general, and administrative expenses	212,833	206,129	153,714
Research and development expenses	50,489	42,198	30,802
Pension settlement expenses			29,928
Amortization of intangibles	24,700	19,337	11,898
Impairment of goodwill and intangible assets		14,809
Total operating expenses	288,022	282,473	226,342
Operating income	218,511	130,644	104,157
Interest expense	13,380	8,628	4,091
Foreign exchange loss (gain)	2,376	472	(1,465)
Other (income) expense, net	(1,282)	(1,730)	(5,417)
Income before income taxes	204,037	123,274	106,948
Income taxes	84,518	18,786	26,082
Net income	$ 119,519	$ 104,488	$ 80,866
Income per share:
Basic (in dollars per share)	$ 5.27	$ 4.63	$ 3.58
Diluted (in dollars per share)	$ 5.21	$ 4.60	$ 3.56
Weighted-average shares and equivalent shares outstanding:
Basic (in shares)	22,687	22,559	22,565
Diluted (in shares)	22,931	22,727	22,719

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Net income	$ 119,519	$ 104,488	$ 80,866
Other comprehensive income (loss):
Pension and postemployment liability adjustments net of tax expense (benefit) of $535, ($1,302) and ($106), respectively	1,235	(3,673)	(1,761)
Pension and postemployment reclassification adjustments, net	(88)	412	1,530
Unrealized (loss) on investments	(974)	(815)	793
Reclassification of pension settlement costs to expense net of tax expense of $11,742 in 2015			21,124
Foreign currency translation adjustments	10,738	(24,832)	(46,231)
Comprehensive income	$ 130,430	$ 75,580	$ 56,321

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Pension and postemployment liability adjustments, tax	$ 535	$ (1,302)	$ (106)
Reclassification adjustments, tax	(150)	0	746
Pension settlement, tax			$ 11,742

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Operating activities
Net income	$ 119,519	$ 104,488	$ 80,866
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	38,311	33,800	29,701
Amortization of Intangible Assets	24,700	19,337	11,898
Impairment of goodwill and intangible assets		14,809
Provision for bad debts	2,414	1,769	164
Non-cash inventory charges	1,607	7,834
Net loss on pension settlement, net of tax			19,308
Loss on sale of product line		1,391
Loss on sale of property, plant, and equipment	3,634	813	1,253
Stock-based compensation	16,315	11,987	10,266
Excess tax benefit on share-based compensation		(3,421)	(1,891)
Deferred income taxes	17,063	(5,269)	11,479
Changes in operating assets and liabilities:
Accounts receivable	(11,087)	(22,779)	(3,397)
Inventories	(20,180)	8,539	(3,577)
Accounts payable	6,494	19,190	2,573
Accrued expenses (including post-retirement)	7,641	2,287	6,482
Accrued payroll and severance	3,709	6,131	5,883
Accrued taxes	39,276	(18,062)	557
Prepaid expenses and other	19,754	(2,711)	(5,739)
Net cash provided by operating activities	269,170	180,133	165,826
Investing activities
Acquisitions of businesses, net of cash acquired	(38,512)	(471,118)	(4,558)
Purchase of cost method investment			(3,500)
Proceeds from maturities of short-term investments	3,739	345
Decrease in entrusted loan	3,599	5,510	7,811
Purchases of property, plant, and equipment	(65,925)	(46,228)	(44,019)
Proceeds from sale of property, plant, and equipment	962	248	102
Net cash used in investing activities	(96,137)	(511,243)	(44,164)
Financing activities:
Proceeds of revolving credit facility	15,000	367,000	49,000
Proceeds of term loan	9,375	125,000
Proceeds of senior notes payable	125,000	226,428
Payments of term loan	(7,188)	(89,688)	(8,750)
Payments of revolving credit facility	(127,500)	(331,500)	(55,500)
Net (payments) proceeds related to stock-based award activities	2,373	(20,494)	(9,150)
Proceeds (payments) from entrusted loan	(3,599)	(5,510)	(7,811)
Debt issuance costs	(1,626)	(3,583)	(42)
Cash dividends paid	(31,770)	(27,866)	(24,341)
Excess tax benefit on share-based compensation		3,421	1,891
Purchases of common stock			(31,252)
Net cash (used in) provided by financing activities	(24,681)	284,196	(67,655)
Effect of exchange rate changes on cash and cash equivalents	6,200	(6,748)	(22,792)
Increase (decrease) in cash and cash equivalents	154,552	(53,662)	31,215
Cash and cash equivalents at beginning of year	275,124	328,786	297,571
Cash and cash equivalents at end of year	$ 429,676	$ 275,124	$ 328,786

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 27, 2014	$ 226	$ 243,844	$ (18,724)	$ (21,126)	$ 519,956	$ 143	$ 724,319
Comprehensive income:
Net income for the year					80,866		80,866
Pension liability adjustments, net				(1,761)			(1,761)
Pension settlement, net				21,124			21,124
Pension and postemployment reclassification adjustments, net				1,530			1,530
Unrealized (loss) on investments				793			793
Foreign currency translation adjustments				(46,231)			(46,231)
Comprehensive income							56,321
Stock-based compensation		7,782					7,782
Withheld			(2,727)				(2,727)
Retirement of treasury stock			18,712		(18,712)
Purchase of common stock	(4)	(1,221)	(30,027)				(31,252)
Stock options exercised	2	9,148					9,150
Cash dividends paid					(24,341)		(24,341)
Balance at Jan. 02, 2016	224	243,844	(32,766)	(45,671)	557,769	143	739,252
Comprehensive income:
Net income for the year					104,488		104,488
Pension liability adjustments, net				(3,673)			(3,673)
Pension settlement, net
Pension and postemployment reclassification adjustments, net				412			412
Unrealized (loss) on investments				(815)			(815)
Foreign currency translation adjustments				(24,832)			(24,832)
Comprehensive income							75,580
Stock-based compensation		7,471					7,471
Withheld			(3,744)				(3,744)
Stock options exercised	4	24,234					24,238
Cash dividends paid					(27,866)		(27,866)
Balance at Dec. 31, 2016	228	291,258	(36,510)	(74,579)	634,391	143	814,931
Comprehensive income:
Net income for the year					119,519		119,519
Pension liability adjustments, net				1,235			1,235
Pension settlement, net
Pension and postemployment reclassification adjustments, net				(88)			(88)
Unrealized (loss) on investments				(974)			(974)
Foreign currency translation adjustments				10,738			10,738
Comprehensive income							130,430
Stock-based compensation		16,315					16,315
Withheld			(4,784)				(4,784)
Stock options exercised	1	2,439					2,440
Cash dividends paid					(31,770)		(31,770)
Non-controlling interest						6	6
Balance at Dec. 30, 2017	$ 229	$ 310,012	$ (41,294)	$ (63,668)	$ 722,140	$ 137	$ 927,556

Consolidated Statements of Equ9

Consolidated Statements of Equity (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Treasury Stock [Member]
Shares withheld on restricted stock grants for withholding taxes (in shares)	30,459,000	31,040,000	28,286,000
Treasury stock, retired (in shares)			214,609,000
Purchase of common stock, shares (in shares)			350,000,000
Common Stock [Member]
Stock options exercised, tax impact		$ (7,400)	$ (2,485)
Retained Earnings [Member]
Cash dividends paid, per share (in dollars per share)	$ 1.40	$ 1.24	$ 1.08
Purchase of common stock, shares (in shares)	0

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies and Other Information	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Significant Accounting Policies [Text Block]	1. Nature of Operations Littelfuse, Inc. and subsidiaries (the “ Company”) is a global leader in circuit protection products with advancing platforms in power control and sensor technologies, serving customers in the electronics, automotive, and industrial markets. With a diverse and extensive product portfolio of fuses, semiconductors, polymers, ceramics, relays and sensors, the Company works with its customers to build safer, more reliable and more efficient products for the connected world in virtually every market that uses electrical energy, ranging across consumer electronics, IT and telecommunication applications, industrial electronics, automobiles and other transportation, and heavy industrial applications. The Company has a network of global engineering centers and labs that develop new products and product enhancements, provides customer application support and test products for safety, reliability, and regulatory compliance. Fiscal Year References herein to “201 7”, 2017” 2017” December 30, 2017. “2016”, 2016” 2016” December 31, 2016. “2015”, 2015” 2015” January 2, 2016. 52 53 4 4 5 December 31. 14 not 52 13 2017 2016 52 2015 53 Basis of Presentation The Consolidated Financial Statements include the accounts of Littelfuse, Inc. and its subsidiaries. All significant intercompany accounts and transactions have been eliminated. The company ’s Consolidated Financial Statements were prepared in accordance with generally accepted accounting principles in the United States of America and include the assets, liabilities, sales and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which the Company exercises control. Use of Estimates The process of preparing financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts of assets and liabilities at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses and the accompanying notes. The Company evaluates and updates its assumptions and estimates on an ongoing basis and may Cash Equivalents All highly liquid investments, with an original maturity of three Short-Term and Long-Term Investments As of December 3 0, 2017, 2017 2016 7.2% €9.2 $11.0 December 30, 2017 €10.0 $10.4 December 31, 2016. 2017 2016, $1.0 $0.8 The Company has certain investment securities that are classified as available-for-sale. Available-for-sale securities are carried at fair value with the unrealized gains and losses reported as a component of “Accumulated Other Comprehensive Income (Loss).” Realized gains and losses and declines in unrealized value judged to be other-than-temporary on available-for-sale securities are included in other expense (income), net. The cost of securities sold is based on the specific identification method. Interest and dividends on securities classified as available-for-sale are included in interest income. Short-term investments, which are primarily certificates of deposits, are carried at cost which approximates fair value. The C ompany has investments related to its non-qualified Supplemental Retirement and Savings Plan. The Company maintains accounts for participants through which participants make investment elections. The investment securities are subject to the claims of the Company’s creditors. The investment securities are all mutual funds with readily determinable fair values and are classified as trading securities. The investment securities are measured at fair value with unrealized gains and losses recognized in earnings. As of December 30, 2017, $8.0 Other assets Trade Receivables The Company performs credit evaluations of customers’ financial condition and generally does not not not The Company also maintains allowances against accounts receivable for the settlement of rebates and sales discounts to customers. These allowances are based upon specific customer sales and sales discounts as well as actual historical experience. Inventories Inventories are stated at the lower of cost or net realizable value, which approximates current replacement cost. Cost is principally determined using the first first Property, Plant , and Equipment Land, buildings , and equipment are carried at cost. Depreciation is calculated using the straight-line method with useful lives of 21 seven nine seven five three Goodwill The Company annually tests goodwill for impairment on the first fourth not The Company compares each reporting unit ’s fair value, estimated based on comparable company market valuations and expected future discounted cash flows to be generated by the reporting unit, to its carrying value. For the seven October 1, 2017 seven October 1, 2017, 161%, 314%, 247%, 218%, 100%, 25%, 248% not 4, Goodwill and Other Intangible Assets, The Company also performs an interim review for indicators of impairment each quarter to assess whether an interim impairment review is required for any reporting unit. As part of its interim reviews, management analyzes potential changes in the value of individual reporting units based on each reporting unit ’s operating results for the period compared to expected results as of the prior year’s annual impairment test. In addition, management considers how other key assumptions, including discount rates and expected long-term growth rates, used in the last annual impairment test, could be impacted by changes in market conditions and economic events. Based on the interim assessments as of December 30, 2017, no not Long-Lived Assets Customer relationships, t rademarks and tradenames are amortized using the straight-line method over estimated useful lives that have a range of five 20 five 17 three 20 The Company assesses potential impairments to its long-lived assets if events or changes in circumstances indicate that the carrying amount of an asset may not During the year ended December 31, 2016, $6.0 $2.2 $3.8 Custom Products tradename. The impairment of the customer relationship intangible assets resulted from lower expectations of future revenue to be derived from those relationships while the tradename impairment resulted from lower expectations of future cash flows of the customs reporting unit. Environmental Liabilities Environmental liabilities are accrued based on engineering studies estimating the cost of remediating sites. Expenses related to on-going maintenance of environmental sites are expensed as incurred. If actual or estimated probable future losses exceed the Company’s recorded liability for such claims, the Company would record additional charges during the period in which the actual loss or change in estimate occurred. Pension and Other Post-retirement Benefits The Company records annual income and expense amounts relating to its pension and post-retirement benefits plans based on calculations which include various actuarial assumptions including discount rates, expected long-term rates of return and compensation increases. The Company reviews its actuarial assumptions on an annual basis as of the fiscal year-end balance sheet date (or more frequently if a significant event requiring remeasurement occurs) and modifies the assumption based on current rates and trends when it is appropriate to do so. The effects of modifications are recognized immediately on the Consolidated Balance Sheets, but are generally amortized into operating earnings over future periods, with the deferred amount recorded in accumulated other comprehensive income (loss). The Company believes that the assumptions utilized in recording its obligations under its plans are reasonable based on its experience, market conditions and input from its actuaries and investment advisors. Revenue Recognition The Company recognizes revenue on product sales in the period in which the sales process is complete. This generally occurs when persuasive evidence of an arrangement exists, products are shipped (FOB origin) to the customer in accordance with the terms of the sale, the risk of loss has been transferred, collectability is reasonably assured, and the pricing is fixed and determinable. 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 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 Company’s distribution channels are primarily through direct sales and independent third Revenue and Billing The Company generally accepts orders from customers based on long term purchasing contracts and written sales agreements. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing normally is 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. Returns and Credits 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 to reduce its price to its buyer. If 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 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 a customer 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 incentives to certain customers to achieve specific quarterly or annual sales targets. If customers achieve their sales targets, they are entitled to rebates. The Company estimates the future cost of these rebates and recognizes this estimated cost as a reduction to revenue as products are sold. Allowance for Doubtful Accounts The Company evaluates the collectability of its trade receivables based on a combination of factors. The Company regularly analyzes its significant customer accounts and, when the Company becomes aware of a specific customer’s inability to meet its financial obligations, the Company records a specific reserve for bad debt to reduce the related receivable to the amount the Company reasonably believes is collectible. The Company also records allowances for all other customers based on a variety of factors including the length of time the receivables are past due, the financial health of the customer, macroeconomic considerations and past experience. Accounts receivable balances that are deemed to be uncollectible, are written off against the reserve on a case-by-case basis. Historically, the allowance for doubtful accounts has been adequate to cover bad debts. If circumstances related to specific customers change, the estimates of the recoverability of receivables could be further adjusted. However, due to the Company’s diverse customer base and lack of credit concentration, the Company does not Advertising Costs The Company expenses advertising costs as incurred, which amounted to $2.9 2017 2016 $2.3 2015, Shipping and Handling Fees and Costs Amounts billed to customers related to shipping and handling is classified as revenue. Costs incurred for shipping and handling of $10.9 $9.1 $7.0 2017, 2016, 2015, Foreign Currency Translation / Remeasurement The Company’s foreign subsidiaries use the local currency or the U.S. dollar as their functional currency, as appropriate. Assets and liabilities are translated using exchange rates at the balance sheet date, and revenues and expenses are translated at weighted average rates. The amount of foreign currency gain or loss from remeasurement recognized in the income statement was a loss of $2.4 2017, $0.5 2016, $1.5 2015. Stock-based Compensation The Company recognizes compensation expense for the cost of awards of equity compensation using a fair value method. Benefits of tax deductions in excess of recognized compensation expense are reported as operating cash flows. See Note 9, Shareholders’ Equity Coal Mining Liability Included in other long-term liabilities is an accrual related to former coal mining operations at Littelfuse GmbH (formerly known as Heinrich Industries, AG) for the amounts of € 0.9 $1.1 €1.4 $1.5 December 30, 2017 December 31, 2016, third not Other Expense (Income), Net Other expense (income), net generally consists of interest income, royalties , and non-operating income. Income Taxes The Company accounts for income taxes using the liability method. Deferred taxes are recognized for the future effects of temporary differences between financial and income tax reporting using enacted tax rates in effect for the years in which the differences are expected to reverse. The Company recognizes deferred taxes for temporary differences, operating loss carryforwards and tax credit carryforwards. Deferred tax assets are reduced by a valuation allowance if it is more likely than not not Deferred U.S. income taxes and non-U.S. taxes are not in those operations. Management regularly evaluates whether non-U.S. earnings are expected to be permanently reinvested. This evaluation requires judgment about the future operating and liquidity needs of the Company’s foreign subsidiaries. Changes in economic and business conditions, non-U.S. or U.S. tax laws, or the Company’s financial situation could result in changes to these judgments and the need to record additional tax liabilities. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not 50% On December 22, 2017, he Tax Cuts and Jobs Act (the "Tax Act"). Among other things, the Tax Act reduces the U.S. corporate federal income tax rate from 35% 21%, one 2017 2018 In accordance with the guidance provided in SEC Staff Accounting Bulletin (“SAB”) No. 118, fourth 2017 $47 $49 $2 No.118. The final charge may may One of the base broadening provisions of the Tax Act is commonly referred to as the global intangible low-taxed income “ GILTI” provisions. In accordance with guidance issued by the FASB staff, the Company has not 118. Fair Value Measurements Certain assets and liabilities are required to be recorded at fair value on a recurring basis. Fair value is determined based on the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. The Company records the fair value of its available-for-sale securities and pension plan assets on a recurring basis. Assets measured at fair value on a nonrecurring basis include long-lived assets held and used, long-lived assets held for sale, goodwill and other intangible assets. The fair value of cash and cash equivalents, accounts receivable, short-term debt and accounts payable approximate their carrying values. The three Level 1 – Valuations based on quoted prices for identical assets and liabilities in active markets. Level 2 – Valuations based on observable inputs other than quoted prices included in Level 1, not Level 3 – Valuations based on unobservable inputs reflecting the Company’s own assumptions, consistent with reasonably available assumptions made by other market participants. Reclassifications Certain reclassifications of prior year amounts for Trade receivables, net Prepaid expenses and other current assets 2017 Recently Adopted Accounting Standards In July 2015, No. 2015 11 – “Inventory (Topic 330 December 15, 2016, January 1, 2017. not first first In March 2016, No. 2016 09 – “Improvements to Employee Share-Based Payment Accounting,” which amends ASC 718, December 15, 2016, January 1, 2017. $2.0 December 30, 2017. not no In January 2017, No. 2017 04, 350 no 2 December 15, 2020, January 1, 2017. ASU did not 2017. Recently Issued Accounting Standards In October 2016, No. 2016 16, ” (Topic 740 December 15, 2017, not In March 2016, No. 2016 09 – “Improvements to Employee Share-Based Payment Accounting,” which amends ASC 718, December 15, 2016, January 1, 2017. $2.0 December 30, 2017. not no In January 2016, No. 2016 01, December 15, 2017. In February 2016, No. 2016 02, 842 twelve December 15, 2018, and the Company plans to adopt the standard in the first 2019. 2016 02. In May 2014, No. 2014 09, 606 605, two one one August, 2015, No. 2015 14, No. 2014 09 December 15, 2017, December 15, 2016. The majority of the Company’s revenue arrangements generally consist of a single performance obligation to transfer promised finished goods. Based on the Company’s evaluation process completed and review of its contracts with customers, the timing and amount of revenue recognized based on ASU 2015 14 December 31, 2017, 2015 14 not

Note 2 - Acquisitions and Dispo

Note 2 - Acquisitions and Dispositions	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	2 . Acquisitions and Dispositions The Company accounts for acquisitions using the acquisition method in accordance with ASC 805, Subsequent Event IXYS Corporation On January 17, 2018, Company acquired IXYS Corporation (“IXYS”), a global pioneer in the power semiconductor and integrated circuit markets with a focus on medium to high voltage power control semiconductors across the industrial, communications, consumer and medical markets. IXYS has a broad customer base, serving more than 3,500 The Company has commenced the determination of the purchase price allocation. Upon completion of the acquisition, at IXYS stockholders’ election and subject to proration, each share of IXYS common stock, par value $0.01 $23.00 0.1265 $0.01 0.1265, 0.1265, Based on the $207.5 January 17, 2018, $814.8 $380.5 $434.2 $41.7 $856.5 2017 U.S. Sensor O n July 7, 2017, $24.3 fourth 2017, . The acquired business expands the Company’s existing sensor portfolio in several key electronics and industrial end markets. U.S. Sensor manufactures a variety of high quality negative temperature coefficient thermistors as well as thermistor probes and assemblies. Product lines also include thin film platinum resistance temperature detectors (“RTDs”) and RTD assemblies. The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the U.S. Sensor acquisition: (in thousands) Purchase Price Allocation Total purchase consideration: Cash $ 24,340 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 4,635 Patented and unpatented technologies 1,090 Trademarks and tradenames 200 Non-compete agreement 50 Customer relationships 2,830 Goodwill 16,075 Current liabilities (540 ) $ 24,340 Included in U.S. Sensor ’s current assets, net was approximately $1.5 As required by purchase accounting rules, the Company recorded a $1.6 third 2017, Monolith In December 2015, $3.5 “Monolith”), a U.S. start-up Company developing silicon carbide technology, which represented approximately 12% $3.5 December 31, 2016. On February 28, 2017, 62% $15 $1.0 $10 no June 30, 2019. The additional investment resulted in the Company gaining control of Monolith and was accounted for as a step-acquisition with the fair value of the original investment immediately before the acquisition estimated to be approximately $3.5 fair value of the investment immediately prior to the transaction equaled the carrying value, there was no Commencing March 1, 2017, ’s Consolidated Financial Statements. Had the acquisition occurred as of January 1, 2017, not The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the Monolith acquisition: (in thousands) Purchase Price Allocation Total purchase consideration: Original investment $ 3,500 Cash, net of cash acquired 14,172 Fair value of commitment to purchase non-controlling interest 9,000 Total purchase consideration $ 26,672 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 891 Property, plant, and equipment 789 Patented and unpatented technologies 6,720 Non-compete agreement 140 Goodwill 20,641 Current liabilities (639 ) Other non-current liabilities (1,870 ) $ 26,672 Included in Monolith ’s current assets, net was approximately $0.7 not 2016 ON Portfolio On August 29, 2016, Company acquired certain assets of select businesses (the “ON Portfolio”) of ON Semiconductor Corporation for $104.0 . The acquired business, which is included in the Electronics segment, consists of a product portfolio that includes transient voltage suppression (“TVS”) diodes, switching thyristors and insulated gate bipolar transistors (“IGBTs”) for automotive ignition applications. The acquisition expands the Company’s offerings in power semiconductor applications as well as increases its presence in the automotive electronics market. The ON Portfolio products have strong synergies with the Company’s existing circuit protection business and will strengthen its channel partnerships and customer engagement. The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the ON Portfolio acquisition: (in thousands) Purcha se Price Allocation Total purchase consideration: Cash $ 104,000 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 4,816 Customer relationships 31,800 Patented and unpatented technologies 8,800 Non-compete agreement 2,500 Goodwill 56,084 $ 104,000 All the ON Portfolio business goodwill and other assets were recorded in the Electronics segment and are reflected in the Americas and Europe geographic areas. The customer relationships are being amortized over 13.5 6 8.5 4 Company’s expected future product sales and synergies from combining the ON Portfolio products with the Company’s existing power semiconductor product portfolio. $7.3 As required by purchase accounting rules, the Company recorded a $0.7 2016, Included in the Company’s Consolidated Statements of Net Income for the year ended December 31, 2016 $21.8 August 29, 2016 Menber ’s On April 4, 2016, Company completed the acquisition of Menber’s S.p.A. (“Menber’s”) headquartered in Legnago, Italy for $19.2 The following table summarizes the preliminary purchase price allocation of the fair value of assets acquired and liabilities assumed in the Menber’s acquisition: (in thousands) Purchase Price Allocation Total purchase consideration: Cash, net of acquired cash $ 19,162 Preliminary allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 12,919 Property, plant, and equipment 1,693 Customer relationships 3,050 Patented and unpatented technologies 224 Trademarks and tradenames 1,849 Goodwill 8,091 Current liabilities (7,220 ) Other non-current liabilities (1,444 ) $ 19,162 All Menber ’s goodwill and other assets and liabilities were recorded in the Automotive segment and reflected in the Europe geographic area. The customer relationships are being amortized over 10 5 10 not As required by purchase accounting rules, the Company recorded a $0.2 2016, Included in the Company’s Consolidated Statements of Net Income for the year ended December 31, 2016 $17.3 April 4, 2016 PolySwitch On March 25, 2016, Company acquired 100% $348.3 has a leading position in polymer based resettable circuit protection devices, with a strong global presence in the automotive, battery, industrial, communications and mobile computing markets. PolySwitch has manufacturing facilities in Shanghai and Kunshan, China and Tsukuba, Japan. The acquisition allows the Company to strengthen its global circuit protection product portfolio, as well as strengthen its presence in the automotive electronics and battery end markets. The acquisition also significantly increases the Company’s presence in Japan. The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the PolySwitch acquisition: (in thousands) Purchase Price Allocation Total purchase consideration: Original consideration $ 350,000 Post closing consideration adjustment received (1,708 ) Acquired cash (3,810 ) Acquired cash to be returned to seller 3,810 Total purchase consideration $ 348,292 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 60,228 Property, plant, and equipment 51,613 Land lease 4,290 Patented and unpatented technologies 56,425 Customer relationships 39,720 Goodwill 165,088 Other long-term assets 11,228 Current liabilities (35,280 ) Other non-current liabilities (5,020 ) $ 348,292 All PolySwitch goodwill and other assets and liabilities were recorded in the Electronics and Automotive segments and reflected in all geographic areas. The customer relationships are being amortized over 15 10 $103.8 $61.3 $64.9 As required by purchase accounting rules, the Company recorded a $6.9 second 2016, Included in the Company’s Consolidated Statements of Net Income for the year ended December 31, 2016 $126.5 March 25, 2016 2016 During the first 2016, Company sold its tangible and intangible assets relating to a marine product line that it acquired as part of its acquisition of Selco A/S in 2011. $1.4 December 31, 2016. 2015 Sigmar S.r.l On October 1, 2015, Company acquired 100% $6.5 $0.9 Located in Ozegna, Italy, Sigmar is a leading global manufacturer of water-in-fuel sensors and also manufactures selective catalytic reduction ( “SCR”) quality sensors and diesel fuel heaters for automotive and commercial vehicle applications. The acquisition further expanded the Company’s automotive sensor product line offerings within its Automotive segment. The Company funded the acquisition with available cash. The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the Sigmar acquisition: (in thousands) Purchase Price Allocation Total purchase consideration: Cash, net of acquired cash $ 5,558 Estimated additional consideration payable 901 Total purchase consideration $ 6,459 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 2,519 Property, plant, and equipment 1,097 Goodwill 4,084 Patents 2,845 Current liabilities (1,518 ) Other non-current liabilities (2,568 ) $ 6,459 All Sigmar goodwill and other assets and liabilities were recorded in the Automotive segment and reflected in the Europe geographic area. The patents are being amortized over 10 Company’s expected future product sales and synergies from combining Sigmar’s products with the Company’s existing automotive product offerings. Goodwill for the above acquisition is not Pro Forma Results The following table summarizes, on a pro forma basis, the combined results of operations of the Company and the acquired PolySwitch and the ON Portfolio businesses as though the acquisitions had occurred as of December 28, 2014. not not not December 28, 2014 For the Year Ended (in thousands, except per share amounts) 2016 2015 Net sales $ 1,130,645 $ 1,104,838 Income before income taxes 143,110 120,370 Net income 124,388 92,983 Net income per share — basic 5.51 4.12 Net income per share — diluted 5.47 4.09 Pro forma results presented above primarily reflect: ( i) incremental depreciation relating to fair value adjustments to property, plant, and equipment; (ii) amortization adjustments relating to fair value estimates of intangible assets; (iii) incremental interest expense on assumed indebtedness; and (iv) additional cost of goods sold relating to the capitalization of gross profit as part of purchase accounting recognized for purposes of the pro forma as if it was recognized during the Company’s first 2015. The historical PolySwitch and ON Portfolio business results for the years ended December 31, 2016 January 2, 2016 not ’s fiscal year ended September 25, 2015. not

Note 3 - Inventories

Note 3 - Inventories	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Inventory Disclosure [Text Block]	3 . Inventories The components of inventories at December 3 0, 2017 December 31, 2016 (in thousands) 201 7 201 6 Raw materials $ 39,030 $ 32,231 Work in process 27,454 23,354 Finished goods 74,305 58,478 Total $ 140,789 $ 114,063 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 4 - Goodwill and Other Int

Note 4 - Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	4. The amounts for goodwill and changes in the carrying value by segment are as follows: (in thousands) Electronics Automotive Industrial Total As of January 2, 2016 $ 58,246 $ 80,262 $ 51,259 $ 189,767 Additions (a) 162,172 70,762 — 232,934 Impairments ( b ) — — (8,794 ) (8,794 ) A djustments ( c ) (4,653 ) (6,439 ) 729 (10,363 ) As of December 31, 2016 $ 215,765 $ 144,585 $ 43,194 $ 403,544 Additions ( d ) 36,716 — — 36,716 Adjustments ( e ) 26,478 (8,756 ) (4,568 ) 13,154 As of December 30, 2017 $ 278,959 $ 135,829 $ 38,626 $ 453,414 (a) The 2016 ( b) The 2016 $8.8 ( c) Adjustments in 2016 ( d) The 2017 (e) Adjustments in 2017 $21.6 $16.8 $4.8 Due to negative events in the potash market in 2016, one Custom Products reporting unit in the third 2016. one two seven $8.8 The components of other intangible assets at December 30, 2017 December 31, 2016 As of December 30, 2017 (in thousands) Weighted Average Useful Life Gross Carrying Value Accumulated Amortization Net Book Value Patents, licenses and software 11.4 $ 141,520 $ 59,609 $ 81,911 Distribution network 12.1 46,233 33,361 12,872 Customer relationships, trademarks and tradenames 15.6 162,679 53,612 109,067 Total $ 350,432 $ 146,582 $ 203,850 As of December 31, 2016 (in thousands) Weighted Average Useful Life Gross Carrying Value Accumulated Amortization Net Book Value Patents, licenses and software 11.4 $ 131,611 $ 48,004 $ 83,607 Distribution network 12.1 49,150 30,155 18,995 Customer relationships, trademarks and tradenames 14.4 150,887 40,463 110,424 Total $ 331,648 $ 118,622 $ 213,026 During the year ended December 31, 2016, $6.0 $2.2 le assets in the Custom Products reporting unit within the Industrial segment and $3.8 During the years ended December 30, 2017 December 31, 2016, $11.0 $144.4 2017 2016 (in thousands) Weighted Average Useful Life Amount Weighted Average Useful Life Amount Patents, licenses and software 9.6 $ 7,810 9.6 $ 65,449 Customer relationships, trademarks and tradenames 9.0 3,220 13.5 78,919 Total $ 11,030 $ 144,368 For intangible assets with definite lives, the Company recorded amortization expense of $24.7 $19.3 $11.9 2017, 2016, 2015, Estimated amortization expense related to intangible assets with definite lives at December 30, 2017 (in thousands ) Amount 2018 $ 25,689 2019 25,528 2020 24,879 2021 23,093 2022 22,058 2023 and thereafter 82,603 $ 203,850

Note 5 - Lease Commitments

Note 5 - Lease Commitments	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Commitments Disclosure [Text Block]	5. The Company leases certain office and warehouse space as well as certain machinery and equipment under non-cancellable operating leases. Rent expense under these leases was $11.6 $12.6 $11.1 2017, 2016, 2015, Rent expense is recognized on a straight-line basis over the term of the leases. The difference between straight-line basis rent and the amount paid has been recorded as accrued lease obligations. The Company also has leases that have lease renewal provisions. As of December 30, 2017, third not December 30, 2017 . Future minimum payments for all non-cancellable operating leases with initial terms of one ecember 30, 2017 (in thousands ) Future Minimum Payments 201 8 $ 10,842 201 9 6,194 20 20 5,425 202 1 4,632 202 2 3,464 202 3 and thereafter 5,021 $ 35,578

Note 6 - Debt

Note 6 - Debt	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Debt Disclosure [Text Block]	6 . Debt The carrying amounts of debt at December 3 0, 2017 December 31, 2016 (in thousands ) 201 7 2016 Revolving Credit Facility $ — $ 112,500 Term Loan 122,500 120,313 Entrusted loan — 3,522 Euro Senior Notes, Series A due 2023 139,623 122,313 Euro Senior Notes, Series B due 2028 113,369 99,314 U .S. Senior Notes, Series A due 2022 25,000 — U .S. Senior Notes, Series B due 2027 100,000 — Unamortized debt issuance costs (4,881 ) (3,820 ) Total debt 495,611 454,142 Less: Current maturities (6,250 ) (6,250 ) Total long-term debt $ 489,361 $ 447,892 Revolving Credit Facility / Term Loan On March 4, 2016, five $700.0 $575.0 $125.0 $150.0 $25.0 $1.6 March 31, 2018 $3.1 June 30, 2018 December 31, 2020 March 4, 2021. On October 13, 2017, the Credit Agreement to increase the Revolving Credit Facility from $575.0 $700.0 $125.0 $200.0 March 4, 2021 October 13, 2022. $300.0 may two first $125.0 October 13, 2017 second $75.0 January 16, 2018. 1.25% $1.6 December 30, 2017 $2.5 second January 16, 2018) October 13, 2022. Outstanding borrowings under the Credit Agreement bear interest, at the Company’s option, at either LIBOR, fixed for interest periods of one, two, three six 1.00% 2.00%, 0.00% 1.00%, 0.15% 0.25%, 3.07% December 30, 2017. As of December 3 0, 2017, $0.1 $699.9 December 30, 2017, Senior Notes On December 8, 2016, Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold €212 two December 8, 2016 €117 1.14% December 8, 2023 ( 2023” , and €95 1.83% December 8, 2028 ( 2028” (together, the “Euro Senior Notes”). Interest on the Euro Senior Notes is payable semiannually on June 8 December 8, June 8, 2017. On December 8, 2016, Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold $125 two February 15, 2017, $25 3.03% February 15, 2022 ( 2022” , and $100 3.74% February 15, 2027 ( 2027” (together, the “U.S. Senior Notes due 2022 2027” 2022 2027 February 15 August 15, August 15, 2017. On November 15, 2017, $175 two January 16, 2018, $50 3.48% February 15, 2025 (“U.S. Senior Notes, Series A due 2025” and $125 3.78% February 15, 2030 ( 2030” (together the “U.S. Senior Notes due 2025 2030” 2022 2027, 2025 2030 February 15 August 15, August 15, 2018. The Senior Notes have not 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 December 30, 2017, The Company may Debt Issuance Costs The Company incurred debt issuance costs of $1.6 $2.6 Entrusted Loan During 2014, Company entered into an entrusted loan arrangement (“Entrusted Loan”) of Chinese renminbi 110.0 $17.9 two two third no 5.25%. November 2019. September 30, 2017. Interest paid on all Company debt was approximately $13.4 $8.6 $4.1 2017, 2016, 2015, Debt Maturities Scheduled maturities of the Company’s long-term debt for each of the five December 30, 2017 (in thousands ) Scheduled Maturities 201 8 $ 6,250 201 9 6,250 20 20 6,250 202 1 6,250 202 2 122,500 202 3 and thereafter 352,992 $ 500,492

Note 7 - Fair Value of Assets a

Note 7 - Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Fair Value Disclosures [Text Block]	7 . Fair Value of Assets and Liabilities For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three 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 Level 3 — Valuations based upon one Following is a description of the valuation methodologies used for instruments measured at fair value and their classification in the valuation hierarchy. Investments Investments in equity securities listed on a national market or exchange are valued at the last sales price and classified within Level 1 1, Summary of Significant Accounting Policies and Other Information Defined Benefit Plan Assets / Non-qualified Supplemental Retirement and Savings Plan Investments See Note 8, Benefit Plans The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 30, 2017: Fair Value Measurements Using (in thousands ) Level 1 Level 2 Level 3 Total Investment in Polytronics $ 10,993 $ — $ — $ 10,993 The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 31, 2016: Fair Value Measurements Using (in thousands ) Level 1 Level 2 Level 3 Total Investment in Polytronics $ 10,435 $ — $ — $ 10,435 Ther e were no 2017 December 30, 2017 December 31, 2016, no 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 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 and term loan debt facilities’ fair values approximate book value at December 30, 2017 December 31, 2016, The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and U.S. Senior Notes, Series A and Series B, as of December 30, 2017 December 31, 2016 2017 2016 (in thousands ) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Euro Senior Notes, Series A due 2023 $ 139,623 $ 138,294 $ 122,313 $ 122,586 Euro Senior Notes, Series B due 2028 113,369 111,579 95,314 99,230 U .S. Senior Notes, Series A due 2022 25,000 24,737 25,000 24,746 U .S. Senior Notes, Series B due 2027 100,000 99,992 100,000 98,660 The fair value as of the measurement date, net book value as of the end of the year and related impairment charge for assets measured at fair value on a nonrecurring basis subsequent to initial recognition during the years ended December 31, 2016 Year Ended December 31, 2016 As of December 31, 2016 (in thousands ) Impairment Charge Fair Value Measurement (Level 3) Net Book Value Goodwill $ 8,794 $ — $ — Other intangible assets 6,015 680 660 Total $ 14,809 $ 680 $ 660 During the year ended December 31, 2016, zero $6.0 $3.8 $2.2 no $0.7 The company ’s accounting and finance management determines the valuation policies and procedures for Level 3 3 December 31, 2016: (in thousands , except rates data ) Fair Value Valuation Technique Unobservable Inputs Rates Tradename $ 680 Relief from royalty Discount rate: 18% R oyalty rate: 1% Customer relationships $ — Excess earnings Discount rate: 18% Attrition rate: 5%

Note 8 - Benefit Plans

Note 8 - Benefit Plans	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	8 . 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. PolySwitch Acquisition During 2016, iabilities were assumed by the Company in mainland China, France, Germany, Japan, Mexico, and Taiwan (China), together with a small amount of plan assets in Taiwan (China). Littelfuse Inc. Retirement Plan Termination The company received approval from the IRS on April 14, 2015 July 30, 2014. third 2015. $9.1 ’s trust in the third 2015 $30.2 third 2015. fourth 2015 $0.3 fourth 2015 $30.2 third 2015, $29.9 January 2, 2016. During 2016, two $0.3 2016, Benefit plan related information is as follows for the years 2017 2016: (in thousands ) 2017 2016 Change in benefit obligation: Benefit obligation at beginning of year $ 55,606 $ 50,282 Service cost 2,037 1,509 Interest cost 1,887 1,662 Net actuarial loss (gain) (433 ) 10,190 Benefits paid from the trust (1,405 ) (2,329 ) Benefits paid directly by the Company (1,098 ) 250 Curtailments and settlements (31 ) (427 ) Acquisitions — 2,023 Effect of exchange rate movements 5,477 (7,554 ) Other 5,228 — Benefit obligation at end of year $ 67,268 $ 55,606 Change in plan assets at fair value: Fair value of plan assets at beginning of year $ 42,208 $ 44,629 Actual return on plan assets 2,962 6,929 Employer contributions 264 (126 ) Benefits paid (1,405 ) (2,329 ) Acquisitions — 24 Effect of exchange rate movements 4,094 (6,919 ) Fair value of plan assets at end of year 48,123 42,208 Net amount recognized/(unfunded status) $ (19,145 ) $ (13,398 ) Amounts recognized in the Consolidated Balance Sheet s as of December 30, 2017 December 31, 2016 (in thousands ) 2017 2016 Amounts recognized in the Consolidated Balance Sheet s consist of: Noncurrent assets $ 78 $ — Current benefit liability (481 ) — Noncurrent benefit liability (18,742 ) (13,398 ) Net liability recognized $ (19,145 ) $ (13,398 ) Amounts recognized in accumulated other comprehensive income (loss), pre-tax as of December 30, 2017 December 31, 2016 consist of: (in thousands ) 2017 2016 Net actuarial loss $ 12,261 $ 13,107 Prior service (cost) — — Net amount recognized , pre-tax $ 12,261 $ 13,107 The estimated net actuarial loss (gain) which will be amortized from accumulated other comprehensive income (loss) into benefit cost in 2018 approximately $0.3 The components of pension exp ense for the years 2017, 2016, 2015 2015 (in thousands ) 2017 2016 U.S. Foreign Total Components of net periodic benefit cost: Service cost $ 2,037 $ 1,509 $ 750 $ 824 $ 1,574 Interest cost 1,887 1,662 3,093 1,735 4,828 Expected return on plan assets (1,990 ) (1,935 ) (2,749 ) (2,346 ) (5,095 ) Amortization of losses 337 306 870 221 1,091 Net periodic benefit cost 2,271 1,542 1,964 434 2,398 Curtailment/Settlement loss (gain) (25 ) (36 ) 29,928 — 29,928 Total expense (income) for the year $ 2,246 $ 1,506 $ 31,892 $ 434 $ 32,326 Weighted average assumptions used to determine net periodic benefit cost for the years 2017, 2016, 2015 2015 2017 2016 U.S. Foreign Discount rate 3.0 % 3.7 % 3.9 % 3.7 % Expected return on plan assets 4.5 % 4.9 % 6.8 % 5.1 % Compensation increase rate 4.5 % 5.3 % — 5.3 % Measurement dates 12/31/16 1/2/16 12/27/14 12/27/14 The accumulated benefit obligation for the foreign plans was $60.5 $51.3 December 30, 2017 December 31, 2016, The following table provides a summary of under-funded or unfunded pension benefit plans with projected benefit obligations in excess of plan assets as of December 30, 2017 December 31, 2016: (in thousands ) 2017 2016 Projected benefit obligation $ 28,515 $ 48,985 Fair value of plan assets 9,292 42,179 The following table provides a summary of under-funded or unfunded pension benefit plans with accumulated benefit obligations in excess of plan assets as of December 30, 2017 December 31, 2016: (in thousands ) 2017 2016 Accumulated benefit obligation $ 18,990 $ 51,306 Fair value of plan assets 6,003 38,912 Weighted average assumptions used to determine benefit obligations as of December 30, 2017, December 31, 2016 January 2, 2016 2017 201 6 201 5 Discount rate 3.1 % 2.6 % 3.8 % Compensation increase rate 5.0 % 4.5 % 6.2 % Measurement dates 12/ 30/17 12/31/16 1/ 2/16 Expected benefit payments to be paid to participants for the fiscal year ending are as follows: (in thousands ) Expected Benefit Payments 201 8 $ 2,467 201 9 2,474 20 20 2,473 202 1 2,802 202 2 2,776 2023-2027 16,777 The Company expects to make approximately $1.4 2018. Defined Benefit Plan Assets Based upon analysis of the target asset allocation and historical retu rns by type of investment, the Company has assumed that the expected long-term rate of return will be 4.5% not Asset Allocation 2017 201 6 Equity securities 35 % 32 % Debt securities 64 % 65 % Cash and equivalents 1 % 3 % 100 % 100 % The Company segregated its plan assets by the following major categories and level for determining their fair value as of December 30, 2017 December 31, 2016. not Cash and cash equivalents – Carrying value approximates fair value. As such these assets were classified as Level 1. Equity – The values of individual equity securities were based on quoted prices in active markets. As such, these assets are classified as Level 1. Fixed income – Fixed income securities are typically priced based on a last trade basis and are exchange-traded. Accordingly, the Company classified fixed income securities as Level 1. For any Level 2 third The valuation methodologies described above may may not no Th e following table presents the Company’s pension plan assets measured at fair value by classification within the fair value hierarchy as of December 30, 2017: Fair Value Measurements Usin g (in thousands ) Level 1 Level 2 L evel 3 NAV Total Equities: Global Equity 50:50 Index Fund $ — $ — $ — $ 7,898 $ 7,898 Global Equity 50:50 GBP Hedged Fund — — — 8,134 8,134 Philippine Stock 1,031 — — — 1,031 Fix ed income: Investment Grade Corporate Bond Funds 6,003 — — — 6,003 Over 15y Gilts Index Fund — — — 3,684 3,684 Active Corp Bond – Over 10 Yr Fund — — — 6,835 6,835 Over 5y Index-Linked Gilts Fund — — — 12,049 12,049 Philippine Long Gov ernment Securities 1,362 — — — 1,362 Philippine Long Corporate Bonds 723 — — — 723 Cash and equivalents 173 — — 231 404 Total pension plan assets $ 9,292 $ — $ — $ 38,831 $ 48,123 Th e following table presents the Company’s pension plan assets measured at fair value by classification within the fair value hierarchy as of December 31, 2016: Fair Value Measurements Using (in thousands ) Level 1 Level 2 L evel 3 NAV Total Equities: Global Equity 50:50 Index Fund $ — $ — $ — $ 6,321 $ 6,321 Global Equity 50:50 GBP Hedged Fund — — — 6,406 6,406 Philippine Stock 906 — — — 906 Fixed income: Investment Grade Corporate Bond Funds 5,372 — — — 5,372 Over 15y Gilts Index Fund — — — 3,265 3,265 Active Corp Bond – Over 10 Yr Fund — — — 5,902 5,902 Over 5y Index-Linked Gilts Fund — — — 10,724 10,724 Philippine Long Gov ernment Securities 1,133 — — — 1,133 Philippine Long Corporate Bonds 751 — — — 751 Cash and equivalents 476 — — 952 1,428 Total pension plan assets $ 8,638 $ — $ — $ 33,570 $ 42,208 Defined Contribution Plan The Company also maintains a 401 100% first 4% may 2% December 30, 2017, December 31, 2016 January 2, 2016. $3.5 $3.2 $2.8 2017, 2016, 2015, Non-qualified Supplemental Retirement and Savings Plan The C ompany 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 investments are subject to the claims of the Company’s creditors and the Company is responsible for the payment of all benefits under the plan from its general assets. As of December 30, 2017, $8.0 Other assets $8.0 Other long-term liabilities 1 $0.3 2017.

Note 9 - Shareholders' Equity

Note 9 - Shareholders' Equity	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	9 . Shareholders’ Equity Equity Plans : The Company has equity-based compensation plans authorizing the granting of stock options, restricted shares, restricted share units, performance shares and other stock rights to employees and directors. As of December 30, 2017, 1.3 Stock options vest over a three, four five seven ten Company generally vest over three four The following table provides a reconciliation of outstanding stock options for the fiscal year ended December 3 0, 2017. Shares Under Option Weighted Average Price Weighted Average Remaining Contract Life (Years) Aggregate Intrinsic Value (000 ’s) Outstanding December 31, 2016 356,184 $ 98.65 Granted 76,082 154.15 Exercised (27,965 ) 84.93 Forfeited — NA Outstanding December 3 0, 2017 404,301 110.04 4.5 $ 35,488 Exercisable December 3 0, 2017 203,745 92.36 3.6 21,486 The following table provides a reconciliation of non-vested restricted share and share unit awards for the fiscal year ended December 3 0, 2017. Shares Weighted Average Grant-Date Fair Value Nonvested December 31, 2016 207,330 $ 106.92 Granted 95,621 151.91 Vested (95,520 ) 102.49 Forfeited (7,738 ) 111.56 Nonvested December 3 0, 2017 199,693 130.40 The total intrinsic value of options exercised during 201 7, 2016, 2015 $2.2 $13.3 $5.0 $15.0 $10.7 $8.1 2017, 2016, 2015, $0.9 $0.6 $0.4 2017, 2016, 2015, The Company recognizes compensation cost of all share-based awards as an expense on a straight-line basis over the vesting period of the awards. At December 30, 2017, $15.9 1.9 $17.3 $12.8 $10.7 2017, 2016, 2015 , respectively. The total income tax benefit recognized in the Consolidated Statements of Net Income was $6.0 $4.4 $3.7 2017, 2016, 2015 , respectively. The Company uses the Black-Scholes option valuation model to determine the fair value of awards granted. The weighted average fair value of and related assumptions for options granted are as follows: 2017 201 6 201 5 Weighted average fair value of options granted $30.77 $26.06 $21.99 Assumptions: Risk-free interest rate 1.79% 1.37% 1.25% Expected dividend yield 0.86% 0.97% 1.04% Expected stock price volatility 23.0% 26.0% 28.0% Expected life of options (years) 4.4 4.6 4.6 Expected volatilities are based on the historical volatility of the Company’s stock price. The expected life of options is based on historical data for options granted by the Company. The risk-free rates are based on yields available at the time of grant on U.S. Treasury bonds with maturities consistent with the expected life assumption. Accumulated Other Comprehensive Income (Loss) (“AOCI”) : The following table sets forth the changes in the components of AOCI by component for fiscal years 2017, 2016, 2015: (in thousands ) Pension and postretirement liability and reclassification adjustments (a) Gain (Loss) on investments Foreign currency translation adjustment s Accumulated other comprehensive income (loss) Balance at December 27, 2014 $ (29,615 ) $ 10,791 $ (2,302 ) $ (21,126 ) 201 5 activity 20,893 793 (46,231 ) (24,545 ) Balance at January 2, 2016 (8,722 ) 11,584 (48,533 ) (45,671 ) 201 6 activity (3,261 ) (815 ) (24,832 ) (28,908 ) Balance at December 31, 2016 (11,983 ) 10,769 (73,365 ) (74,579 ) 2017 activity 1,147 (974 ) 10,738 10,911 Balance at December 30, 2017 $ (10,836 ) $ 9,795 $ (62,627 ) $ (63,668 ) (a) Net of tax of $ 1.4 $1.1 $0.7 December 30, 2017; December 31, 2016; January 2, 2016, Preferred Stock : The Board of Directors may one may The Company’s Board of Directors authorized the repurchase of up to 1,000,000 May 1, 2017 April 30, 2018. not 2017

Note 10 - Income Taxes

Note 10 - Income Taxes	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	10. Income Taxes On December 22, 2017, he Tax Cuts and Jobs Act (the "Tax Act"). Among other things, the Tax Act reduces the U.S. corporate federal income tax rate from 35% 21%, one 2017 2018 In accordance with the guidance provided in SEC Staff Accounting Bulletin (“SAB”) No. 118, fourth 2017 $47 $49 $2 No. 118. may may One of the base broadening provisions of the Tax Act is commonly referred to as the “GILTI” provisions. In accordance with guidance issued by the FASB staff, the Company has not 118. Domestic and foreign income (loss) before income taxes is as follows: (in thousands ) 201 7 201 6 201 5 Domestic $ (20,496 ) $ (9,563 ) $ 1,313 Foreign 224,533 132,837 105,635 Income before income taxes $ 204,037 $ 123,274 $ 106,948 Federal, state and foreign income tax expense (benefit) consists of the following: (in thousands ) 201 7 201 6 201 5 Current: Federal $ 34,060 $ (3,992 ) $ (6,686 ) State 450 (648 ) 2,078 Foreign 32,945 28,695 19,211 Subtotal 67,455 24,055 14,603 Deferred: Federal and State 16,562 (1,594 ) 11,330 Foreign 501 (3,675 ) 149 Subtotal 17,063 (5,269 ) 11,479 Provision for income taxes $ 84,518 $ 18,786 $ 26,082 The current federal and state income tax expense for 2017 $49 for the Toll Charge as discussed above, partially offset by $13 2017 eight 2017 $32 O ther long-term liabilit ies December 30, 2017. The current federal tax benefit for 2016 $3 2016 2014 The current federal tax benefit for 2015 $11.7 ’s termination of the U.S. defined benefit pension plan as described in Note 8, Benefit Plans A reconciliation between income taxes computed on income before income taxes at the federal statutory rate and the provision for income taxes is provided below: (in thousands ) 201 7 201 6 201 5 Tax expense at statutory rate of 35% $ 71,413 $ 43,146 $ 37,432 Provisional amount of the Toll charge 49,000 — — Provisional Tax Act impact other than the Toll charge (1,962 ) — — State and local taxes, net of federal tax benefit 292 (415 ) 1,907 Non-U.S. income tax rate differential (47,077 ) (25,471 ) (18,253 ) Impairment of goodwill without tax benefit — 3,088 — Tax on unremitted earnings 12,202 2,747 — Mexico manufacturing operations restructuring — — 4,841 Nondeductible professional fees 1,240 313 1,011 Tax deduction for stock of foreign subsidiary — (3,896 ) — Other, net (590 ) (726 ) (856 ) Provision for income taxes $ 84,518 $ 18,786 $ 26,082 Deferred income taxes are provided for the tax effects of temporary differences between the financial reporting bases and the tax bases of the company ’s assets and liabilities. Significant components of the company’s deferred tax assets and liabilities at December 30, 2017 December 31, 2016, (in thousands) 2017 2016 Deferred tax assets: Accrued expenses $ 24,094 $ 31,770 Foreign tax credit carryforwards 1,053 6,472 Accrued restructuring 156 456 Capital losses 3,165 4,557 Domestic and foreign net operating loss carryforwards 5,778 2,223 Gross deferred tax assets 34,246 45,478 Less: Valuation allowance (6,203 ) (6,738 ) Total deferred tax assets 28,043 38,740 Deferred tax liabilities: Tax depreciation and amortization in excess of book 21,254 23,471 T ax on unremitted earnings 12,000 1,750 Total deferred tax liabilities 33,254 25,221 Net deferred tax (liabilities) assets $ (5,211 ) $ 13,519 The deferred tax asset valuation allowance is related to a U.S. capital loss carryover (which expire in 2018 not no tion date or are expected to be utilized prior to expiration (which begin expiring in 2021 $31.8 $35.6 $23.3 2017, 2016, 2015, $13.7 2017. Deferred income taxes are not December 30, 2017, ’s non-U.S. subsidiaries was approximately $680 $12.0 $11.8 $0.2 December 30, 2017 $1.8 December 31, 2016, not may no The Company has three three 2018, $5.7 $0.25 2017, A reconciliation of the beginning and ending amount of unrecognized tax benefits as of December 30, 2017, December 31, 2016, January 2, 2016 (in thousands, except per share amounts ) Unrecognized Tax Benefits Balance at January 2, 2016 $ 3,532 Additions for tax positions taken in the current year 2,696 Additions for tax positions taken in the pre-acquisition periods of acquired subsidiaries 2,491 Settlements (102 ) Balance at December 31, 2016 $ 8,617 Additions for tax positions taken in the current year 370 Other (1,327 ) Balance at December 30, 2017 $ 7,660 The company recognizes accrued interest and penalties associated with uncertain tax positions as part of income tax expense. The company recognized interest expense of $0.9 $0.9 $0.2 2017, 2016, 2015, $3.3 $2.4 $1.5 December 30, 2017, December 31, 2016, January 2, 2016, The amount of unrecognized tax benefits at December 30, 2017 7.7 not 12 None The U.S. federal statute of limitations remains open for 201 4 2014 2016 no 2017, 2015 2016 2014 2016 three seven 2011 2014. one not

Note 11 - Earnings Per Share

Note 11 - Earnings Per Share	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Earnings Per Share [Text Block]	11 . Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share: (in thousands, except per share amounts ) 201 7 201 6 201 5 Numerator: Net income as reported $ 119,519 $ 104,488 $ 80,866 Denominator: Weighted average shares outstanding Basic 22,687 22,559 22,565 Effect of dilutive securities 244 168 154 Diluted 22,931 22,727 22,719 Earnings Per Share: Basic earnings per share $ 5.27 $ 4.63 $ 3.58 Diluted earnings per share $ 5.21 $ 4.60 $ 3.56 Potential shares of common stock attributable to stock options excluded from the earnings per share calculation because their effect would be anti-dilutive were 37,443 53,448 113,130 2017, 2016, 2015, On January 17, 2018, 2.1 rted IXYS equity awards into approximately 0.5

Note 12 - Segment Information

Note 12 - Segment Information	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	12 . Segment Information The Company and its subsidiaries design, manufacture and sell components and modules for circuit protection, power control and sensing throughout the 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 not Sales, marketing , and research and development expenses are charged directly into each operating segment. Manufacturing, purchasing, logistics, customer service, finance, information technology, and human resources are shared functions that are allocated back to the three not not not not not not one may ● Electronics Segment : Consists of one ● 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 the automotive, commercial vehicle, and agricultural and construction equipment industries. Passenger car fuse products include fuses and fuse accessories, including blade fuses, battery cable protectors, varistors, high-current fuses, and high-voltage fuses for hybrid and electric vehicles. Commercial vehicle products include fuses, switches, relays, and power distribution modules for the commercial vehicle industry. Automotive sensor products include a wide range of automotive and commercial vehicle sensors designed to monitor the passenger compartment occupants and environment as well as the vehicle’s powertrain, emissions, speed and suspension. ● Industrial Segment: Consists of power fuses, protection relays and controls and other circuit protection products for use in heavy industrial applications such as mining, oil and gas, energy storage, construction, HVAC systems, elevator and other industrial equipment. The Company has provided this segment information for all comparable prior periods. Segment information is summarized as follows: (in thousands ) 201 7 201 6 201 5 Net sales Electronics $ 661,928 $ 535,191 $ 405,497 Automotive 453,227 415,200 339,957 Industrial 106,379 105,768 122,410 Total net sales $ 1,221,534 $ 1,056,159 $ 867,864 Depreciation and amortization Electronics $ 35,215 $ 29,141 $ 22,936 Automotive 22,459 18,107 13,437 Industrial 5,337 5,889 5,268 Total depreciation and amortization $ 63,011 $ 53,137 $ 41,641 Operating income (loss) Electronics $ 155,880 $ 117,088 $ 78,194 Automotive 62,571 59,905 53,086 Industrial 10,334 3,615 18,094 Other (a) (10,274 ) (49,964 ) (45,217 ) Total operating income 218,511 130,644 104,157 Interest expense 13,380 8,628 4,091 Foreign exchange loss (gain) 2,376 472 (1,465 ) Other (income) expense, net (1,282 ) (1,730 ) (5,417 ) Income before income taxes $ 204,037 $ 123,274 $ 106,948 (a) Included in “Other” Operating income (loss) for 2017 $8.0 Cost of sales Selling, general, and administrative expenses $2.2 Included in “Other” Operating income (loss) for 2016 Custom Products reporting unit ( $14.8 2016 $29.2 $1.6 $1.9 $2.5 Research and development expenses Included in “Other” Operating income (loss) for 2015 Company’s reed switch manufacturing operations from its Lake Mills, Wisconsin and Suzhou, China locations to the Philippines ( $5.2 $4.6 $31.9 $3.6 The Company’s significant net sales, long-lived assets and additions to long-lived assets by country for the fiscal years ended 2017, 2016, 2015 (in thousands ) 201 7 201 6 201 5 Net sales United States $ 383,025 $ 356,674 $ 344,305 China 321,111 263,701 193,792 Other countries 517,398 435,784 329,767 Total net sales $ 1,221,534 $ 1,056,159 $ 867,864 Long-lived assets United States $ 23,490 $ 23,731 $ 23,965 China 86,310 65,345 37,241 Mexico 62,510 52,262 47,130 Philippines 31,129 33,345 33,525 Other countries 47,138 42,492 20,707 Total long-lived assets $ 250,577 $ 217,175 $ 162,568 Additions to long-lived assets United States $ 3,518 $ 4,694 $ 8,609 China 32,775 13,181 9,710 Mexico 19,395 15,667 9,193 Philippines 2,979 5,096 12,620 Other countries 7,258 7,590 3,887 Total additions to long-lived assets $ 65,925 $ 46,228 $ 44,019 For the year ended December 30, 2017, 69% 26% 10.6% 2017 10% 2016 2015. No 10% three

Note 13 - Selected Quarterly Fi

Note 13 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Quarterly Financial Information [Text Block]	1 3 . Selected Quarterly Financial Data (Unaudited) The quarterly periods for 201 7 13 December 30, 2017, September 30, 2017, July 1, 2017, April 1, 2017, 2016 13 December 31, 2016, October 1, 2016, July 2, 2016, April 2, 2016, (in thousands, except per share data ) 2017 2016 4Q (a) 3 Q (b ) 2 Q (c ) 1 Q (d ) 4Q (e ) 3 Q (f ) 2 Q (g ) 1 Q (h ) Net sales $ 304,849 $ 317,889 $ 313,355 $ 285,441 $ 284,518 $ 280,331 $ 271,912 $ 219,398 Gross profit 126,624 133,651 132,608 113,650 114,337 113,759 97,866 87,155 Operating income 50,780 58,609 60,270 48,852 40,988 27,526 29,702 32,428 Net income/(loss) (10,819 ) 42,808 48,638 38,891 27,245 30,802 27,152 19,289 Net income/(loss per share Basic $ (0.48 ) $ 1.88 $ 2.13 $ 1.71 $ 1.20 $ 1.36 $ 1.21 $ 0.86 Diluted $ (0.48 ) $ 1.87 $ 2.11 $ 1.69 $ 1.19 $ 1.35 $ 1.20 $ 0.85 ( a) In the fourth 2017, one $49 $1.4 $0.7 ( b) In the third 2017, $4.8 $1.5 ( c) In the second 2017, $0.3 ( d) In the first 2017, $1.5 ( e) In the fourth 2016, $0.1 $1.2 $3.2 $0.3 2016 ( f) In the third 2016, $0.9 $5.9 $14.8 $0.5 ( g) In the second 2016, $0.7 $0.1 $6.1 $0.3 $6.9 ( h) In the first 2016, $1.0 $0.4 $6.2 $1.6

Schedule II

Schedule II	12 Months Ended
	Dec. 30, 2017
Notes to Financial Statements
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	VALUATION AND QUALIFYING ACCOUNTS AND RESERVES Description Balance at Beginning of Year Charged to Costs and Expenses ( a) Deductions ( b ) Other ( c ) Balance at End of Year (in thousands ) Year ended December 3 0, 2017 Allowance for losses on accounts receivable $ 2,079 $ 3,068 $ (4,070 ) $ 95 $ 1,172 Reserves for sales discounts and allowances $ 23,825 $ 106,781 $ (104,941 ) $ 679 $ 26,344 Deferred tax valuation allowance $ 6,738 $ — $ — $ (535 ) $ 6,203 Year ended December 31, 2016 Allowance for losses on accounts receivable $ 319 $ 1,769 $ (42 ) $ 33 $ 2,079 Reserves for sales discounts and allowances $ 17,168 $ 91,632 $ (90,837 ) $ 5,862 $ 23,825 Deferred tax valuation allowance $ 4,557 $ — $ — $ 2,181 $ 6,738 Year ended January 2, 2016 Allowance for losses on accounts receivable $ 278 $ 164 $ 150 $ 27 $ 319 Reserves for sales discounts and allowances $ 19,140 $ 81,335 $ 82,997 $ (310 ) $ 17,168 Deferred tax valuation allowance $ 4,557 $ — $ — $ — $ 4,557 (a) Includes provision for doubtful accounts, sales returns and sales discounts granted to customers. (b) Represents uncollectible accounts written off, net of recoveries and credits issued to customers and the write-off of certain deferred tax assets that previously had full valuation allowances. (c) Represents business acquisitions, U.S. and non-U.S. subsidiary tax attributes and foreign currency translation adjustments.

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 30, 2017
Accounting Policies [Abstract]
Fiscal Period, Policy [Policy Text Block]	Fiscal Year References herein to “201 7”, 2017” 2017” December 30, 2017. “2016”, 2016” 2016” December 31, 2016. “2015”, 2015” 2015” January 2, 2016. 52 53 4 4 5 December 31. 14 not 52 13 2017 2016 52 2015 53
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The Consolidated Financial Statements include the accounts of Littelfuse, Inc. and its subsidiaries. All significant intercompany accounts and transactions have been eliminated. The company ’s Consolidated Financial Statements were prepared in accordance with generally accepted accounting principles in the United States of America and include the assets, liabilities, sales and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which the Company exercises control.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The process of preparing financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts of assets and liabilities at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses and the accompanying notes. The Company evaluates and updates its assumptions and estimates on an ongoing basis and may
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents All highly liquid investments, with an original maturity of three
Investment, Policy [Policy Text Block]	Short-Term and Long-Term Investments As of December 3 0, 2017, 2017 2016 7.2% €9.2 $11.0 December 30, 2017 €10.0 $10.4 December 31, 2016. 2017 2016, $1.0 $0.8 The Company has certain investment securities that are classified as available-for-sale. Available-for-sale securities are carried at fair value with the unrealized gains and losses reported as a component of “Accumulated Other Comprehensive Income (Loss).” Realized gains and losses and declines in unrealized value judged to be other-than-temporary on available-for-sale securities are included in other expense (income), net. The cost of securities sold is based on the specific identification method. Interest and dividends on securities classified as available-for-sale are included in interest income. Short-term investments, which are primarily certificates of deposits, are carried at cost which approximates fair value. The C ompany has investments related to its non-qualified Supplemental Retirement and Savings Plan. The Company maintains accounts for participants through which participants make investment elections. The investment securities are subject to the claims of the Company’s creditors. The investment securities are all mutual funds with readily determinable fair values and are classified as trading securities. The investment securities are measured at fair value with unrealized gains and losses recognized in earnings. As of December 30, 2017, $8.0 Other assets
Receivables, Policy [Policy Text Block]	Trade Receivables The Company performs credit evaluations of customers’ financial condition and generally does not not not The Company also maintains allowances against accounts receivable for the settlement of rebates and sales discounts to customers. These allowances are based upon specific customer sales and sales discounts as well as actual historical experience.
Inventory, Policy [Policy Text Block]	Inventories Inventories are stated at the lower of cost or net realizable value, which approximates current replacement cost. Cost is principally determined using the first first
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant , and Equipment Land, buildings , and equipment are carried at cost. Depreciation is calculated using the straight-line method with useful lives of 21 seven nine seven five three
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill The Company annually tests goodwill for impairment on the first fourth not The Company compares each reporting unit ’s fair value, estimated based on comparable company market valuations and expected future discounted cash flows to be generated by the reporting unit, to its carrying value. For the seven October 1, 2017 seven October 1, 2017, 161%, 314%, 247%, 218%, 100%, 25%, 248% not 4, Goodwill and Other Intangible Assets, The Company also performs an interim review for indicators of impairment each quarter to assess whether an interim impairment review is required for any reporting unit. As part of its interim reviews, management analyzes potential changes in the value of individual reporting units based on each reporting unit ’s operating results for the period compared to expected results as of the prior year’s annual impairment test. In addition, management considers how other key assumptions, including discount rates and expected long-term growth rates, used in the last annual impairment test, could be impacted by changes in market conditions and economic events. Based on the interim assessments as of December 30, 2017, no not
Intangible Assets, Finite-Lived, Policy [Policy Text Block]	Long-Lived Assets Customer relationships, t rademarks and tradenames are amortized using the straight-line method over estimated useful lives that have a range of five 20 five 17 three 20 The Company assesses potential impairments to its long-lived assets if events or changes in circumstances indicate that the carrying amount of an asset may not During the year ended December 31, 2016, $6.0 $2.2 $3.8 Custom Products tradename. The impairment of the customer relationship intangible assets resulted from lower expectations of future revenue to be derived from those relationships while the tradename impairment resulted from lower expectations of future cash flows of the customs reporting unit.
Environmental Costs, Policy [Policy Text Block]	Environmental Liabilities Environmental liabilities are accrued based on engineering studies estimating the cost of remediating sites. Expenses related to on-going maintenance of environmental sites are expensed as incurred. If actual or estimated probable future losses exceed the Company’s recorded liability for such claims, the Company would record additional charges during the period in which the actual loss or change in estimate occurred.
Pension and Other Postretirement Plans, Policy [Policy Text Block]	Pension and Other Post-retirement Benefits The Company records annual income and expense amounts relating to its pension and post-retirement benefits plans based on calculations which include various actuarial assumptions including discount rates, expected long-term rates of return and compensation increases. The Company reviews its actuarial assumptions on an annual basis as of the fiscal year-end balance sheet date (or more frequently if a significant event requiring remeasurement occurs) and modifies the assumption based on current rates and trends when it is appropriate to do so. The effects of modifications are recognized immediately on the Consolidated Balance Sheets, but are generally amortized into operating earnings over future periods, with the deferred amount recorded in accumulated other comprehensive income (loss). The Company believes that the assumptions utilized in recording its obligations under its plans are reasonable based on its experience, market conditions and input from its actuaries and investment advisors.
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition The Company recognizes revenue on product sales in the period in which the sales process is complete. This generally occurs when persuasive evidence of an arrangement exists, products are shipped (FOB origin) to the customer in accordance with the terms of the sale, the risk of loss has been transferred, collectability is reasonably assured, and the pricing is fixed and determinable. 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 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 Company’s distribution channels are primarily through direct sales and independent third
Revenue Recognition And Billing [Policy Text Block]	Revenue and Billing The Company generally accepts orders from customers based on long term purchasing contracts and written sales agreements. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing normally is 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.
Revenue Recognition, Sales Returns [Policy Text Block]	Returns and Credits 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 to reduce its price to its buyer. If 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 and actual authorizations for the debit and recognizes these debits as a reduction of revenue.
Revenue Recognition Return to Stock [Policy Text Block]	Return to Stock The Company has a return to stock policy whereby a customer 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.
Revenue Recognition, Rebates [Policy Text Block]	Volume Rebates The Company offers incentives to certain customers to achieve specific quarterly or annual sales targets. If customers achieve their sales targets, they are entitled to rebates. The Company estimates the future cost of these rebates and recognizes this estimated cost as a reduction to revenue as products are sold.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Doubtful Accounts The Company evaluates the collectability of its trade receivables based on a combination of factors. The Company regularly analyzes its significant customer accounts and, when the Company becomes aware of a specific customer’s inability to meet its financial obligations, the Company records a specific reserve for bad debt to reduce the related receivable to the amount the Company reasonably believes is collectible. The Company also records allowances for all other customers based on a variety of factors including the length of time the receivables are past due, the financial health of the customer, macroeconomic considerations and past experience. Accounts receivable balances that are deemed to be uncollectible, are written off against the reserve on a case-by-case basis. Historically, the allowance for doubtful accounts has been adequate to cover bad debts. If circumstances related to specific customers change, the estimates of the recoverability of receivables could be further adjusted. However, due to the Company’s diverse customer base and lack of credit concentration, the Company does not
Advertising Costs, Policy [Policy Text Block]	Advertising Costs The Company expenses advertising costs as incurred, which amounted to $2.9 2017 2016 $2.3 2015,
Shipping and Handling Cost, Policy [Policy Text Block]	Shipping and Handling Fees and Costs Amounts billed to customers related to shipping and handling is classified as revenue. Costs incurred for shipping and handling of $10.9 $9.1 $7.0 2017, 2016, 2015,
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation / Remeasurement The Company’s foreign subsidiaries use the local currency or the U.S. dollar as their functional currency, as appropriate. Assets and liabilities are translated using exchange rates at the balance sheet date, and revenues and expenses are translated at weighted average rates. The amount of foreign currency gain or loss from remeasurement recognized in the income statement was a loss of $2.4 2017, $0.5 2016, $1.5 2015.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock-based Compensation The Company recognizes compensation expense for the cost of awards of equity compensation using a fair value method. Benefits of tax deductions in excess of recognized compensation expense are reported as operating cash flows. See Note 9, Shareholders’ Equity
Coal Mining Liability [Policy Text Block]	Coal Mining Liability Included in other long-term liabilities is an accrual related to former coal mining operations at Littelfuse GmbH (formerly known as Heinrich Industries, AG) for the amounts of € 0.9 $1.1 €1.4 $1.5 December 30, 2017 December 31, 2016, third not
Other Income Expense [Policy Text Block]	Other Expense (Income), Net Other expense (income), net generally consists of interest income, royalties , and non-operating income.
Income Tax, Policy [Policy Text Block]	Income Taxes The Company accounts for income taxes using the liability method. Deferred taxes are recognized for the future effects of temporary differences between financial and income tax reporting using enacted tax rates in effect for the years in which the differences are expected to reverse. The Company recognizes deferred taxes for temporary differences, operating loss carryforwards and tax credit carryforwards. Deferred tax assets are reduced by a valuation allowance if it is more likely than not not Deferred U.S. income taxes and non-U.S. taxes are not in those operations. Management regularly evaluates whether non-U.S. earnings are expected to be permanently reinvested. This evaluation requires judgment about the future operating and liquidity needs of the Company’s foreign subsidiaries. Changes in economic and business conditions, non-U.S. or U.S. tax laws, or the Company’s financial situation could result in changes to these judgments and the need to record additional tax liabilities. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not 50% On December 22, 2017, he Tax Cuts and Jobs Act (the "Tax Act"). Among other things, the Tax Act reduces the U.S. corporate federal income tax rate from 35% 21%, one 2017 2018 In accordance with the guidance provided in SEC Staff Accounting Bulletin (“SAB”) No. 118, fourth 2017 $47 $49 $2 No.118. The final charge may may One of the base broadening provisions of the Tax Act is commonly referred to as the global intangible low-taxed income “ GILTI” provisions. In accordance with guidance issued by the FASB staff, the Company has not 118.
Fair Value Measurement, Policy [Policy Text Block]	Fair Value Measurements Certain assets and liabilities are required to be recorded at fair value on a recurring basis. Fair value is determined based on the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. The Company records the fair value of its available-for-sale securities and pension plan assets on a recurring basis. Assets measured at fair value on a nonrecurring basis include long-lived assets held and used, long-lived assets held for sale, goodwill and other intangible assets. The fair value of cash and cash equivalents, accounts receivable, short-term debt and accounts payable approximate their carrying values. The three Level 1 – Valuations based on quoted prices for identical assets and liabilities in active markets. Level 2 – Valuations based on observable inputs other than quoted prices included in Level 1, not Level 3 – Valuations based on unobservable inputs reflecting the Company’s own assumptions, consistent with reasonably available assumptions made by other market participants.
Reclassification, Policy [Policy Text Block]	Reclassifications Certain reclassifications of prior year amounts for Trade receivables, net Prepaid expenses and other current assets 2017
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Standards In October 2016, No. 2016 16, ” (Topic 740 December 15, 2017, not In March 2016, No. 2016 09 – “Improvements to Employee Share-Based Payment Accounting,” which amends ASC 718, December 15, 2016, January 1, 2017. $2.0 December 30, 2017. not no In January 2016, No. 2016 01, December 15, 2017. In February 2016, No. 2016 02, 842 twelve December 15, 2018, and the Company plans to adopt the standard in the first 2019. 2016 02. In May 2014, No. 2014 09, 606 605, two one one August, 2015, No. 2015 14, No. 2014 09 December 15, 2017, December 15, 2016. The majority of the Company’s revenue arrangements generally consist of a single performance obligation to transfer promised finished goods. Based on the Company’s evaluation process completed and review of its contracts with customers, the timing and amount of revenue recognized based on ASU 2015 14 December 31, 2017, 2015 14 not

Note 2 - Acquisitions and Dis25

Note 2 - Acquisitions and Dispositions (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	(in thousands) Purchase Price Allocation Total purchase consideration: Cash $ 24,340 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 4,635 Patented and unpatented technologies 1,090 Trademarks and tradenames 200 Non-compete agreement 50 Customer relationships 2,830 Goodwill 16,075 Current liabilities (540 ) $ 24,340 (in thousands) Purchase Price Allocation Total purchase consideration: Original investment $ 3,500 Cash, net of cash acquired 14,172 Fair value of commitment to purchase non-controlling interest 9,000 Total purchase consideration $ 26,672 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 891 Property, plant, and equipment 789 Patented and unpatented technologies 6,720 Non-compete agreement 140 Goodwill 20,641 Current liabilities (639 ) Other non-current liabilities (1,870 ) $ 26,672 (in thousands) Purcha se Price Allocation Total purchase consideration: Cash $ 104,000 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 4,816 Customer relationships 31,800 Patented and unpatented technologies 8,800 Non-compete agreement 2,500 Goodwill 56,084 $ 104,000 (in thousands) Purchase Price Allocation Total purchase consideration: Cash, net of acquired cash $ 19,162 Preliminary allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 12,919 Property, plant, and equipment 1,693 Customer relationships 3,050 Patented and unpatented technologies 224 Trademarks and tradenames 1,849 Goodwill 8,091 Current liabilities (7,220 ) Other non-current liabilities (1,444 ) $ 19,162 (in thousands) Purchase Price Allocation Total purchase consideration: Original consideration $ 350,000 Post closing consideration adjustment received (1,708 ) Acquired cash (3,810 ) Acquired cash to be returned to seller 3,810 Total purchase consideration $ 348,292 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 60,228 Property, plant, and equipment 51,613 Land lease 4,290 Patented and unpatented technologies 56,425 Customer relationships 39,720 Goodwill 165,088 Other long-term assets 11,228 Current liabilities (35,280 ) Other non-current liabilities (5,020 ) $ 348,292 (in thousands) Purchase Price Allocation Total purchase consideration: Cash, net of acquired cash $ 5,558 Estimated additional consideration payable 901 Total purchase consideration $ 6,459 Allocation of consideration to assets acquired and liabilities assumed: Current assets, net $ 2,519 Property, plant, and equipment 1,097 Goodwill 4,084 Patents 2,845 Current liabilities (1,518 ) Other non-current liabilities (2,568 ) $ 6,459
Business Acquisition, Pro Forma Information [Table Text Block]	For the Year Ended (in thousands, except per share amounts) 2016 2015 Net sales $ 1,130,645 $ 1,104,838 Income before income taxes 143,110 120,370 Net income 124,388 92,983 Net income per share — basic 5.51 4.12 Net income per share — diluted 5.47 4.09

Note 3 - Inventories (Tables)

Note 3 - Inventories (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Inventory, Current [Table Text Block]	(in thousands) 201 7 201 6 Raw materials $ 39,030 $ 32,231 Work in process 27,454 23,354 Finished goods 74,305 58,478 Total $ 140,789 $ 114,063

Note 4 - Goodwill and Other I27

Note 4 - Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Goodwill [Table Text Block]	(in thousands) Electronics Automotive Industrial Total As of January 2, 2016 $ 58,246 $ 80,262 $ 51,259 $ 189,767 Additions (a) 162,172 70,762 — 232,934 Impairments ( b ) — — (8,794 ) (8,794 ) A djustments ( c ) (4,653 ) (6,439 ) 729 (10,363 ) As of December 31, 2016 $ 215,765 $ 144,585 $ 43,194 $ 403,544 Additions ( d ) 36,716 — — 36,716 Adjustments ( e ) 26,478 (8,756 ) (4,568 ) 13,154 As of December 30, 2017 $ 278,959 $ 135,829 $ 38,626 $ 453,414
Schedule of Finite-Lived Intangible Assets [Table Text Block]	As of December 30, 2017 (in thousands) Weighted Average Useful Life Gross Carrying Value Accumulated Amortization Net Book Value Patents, licenses and software 11.4 $ 141,520 $ 59,609 $ 81,911 Distribution network 12.1 46,233 33,361 12,872 Customer relationships, trademarks and tradenames 15.6 162,679 53,612 109,067 Total $ 350,432 $ 146,582 $ 203,850 As of December 31, 2016 (in thousands) Weighted Average Useful Life Gross Carrying Value Accumulated Amortization Net Book Value Patents, licenses and software 11.4 $ 131,611 $ 48,004 $ 83,607 Distribution network 12.1 49,150 30,155 18,995 Customer relationships, trademarks and tradenames 14.4 150,887 40,463 110,424 Total $ 331,648 $ 118,622 $ 213,026 2017 2016 (in thousands) Weighted Average Useful Life Amount Weighted Average Useful Life Amount Patents, licenses and software 9.6 $ 7,810 9.6 $ 65,449 Customer relationships, trademarks and tradenames 9.0 3,220 13.5 78,919 Total $ 11,030 $ 144,368
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(in thousands ) Amount 2018 $ 25,689 2019 25,528 2020 24,879 2021 23,093 2022 22,058 2023 and thereafter 82,603 $ 203,850

Note 5 - Lease Commitments (Tab

Note 5 - Lease Commitments (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	(in thousands ) Future Minimum Payments 201 8 $ 10,842 201 9 6,194 20 20 5,425 202 1 4,632 202 2 3,464 202 3 and thereafter 5,021 $ 35,578

Note 6 - Debt (Tables)

Note 6 - Debt (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	(in thousands ) 201 7 2016 Revolving Credit Facility $ — $ 112,500 Term Loan 122,500 120,313 Entrusted loan — 3,522 Euro Senior Notes, Series A due 2023 139,623 122,313 Euro Senior Notes, Series B due 2028 113,369 99,314 U .S. Senior Notes, Series A due 2022 25,000 — U .S. Senior Notes, Series B due 2027 100,000 — Unamortized debt issuance costs (4,881 ) (3,820 ) Total debt 495,611 454,142 Less: Current maturities (6,250 ) (6,250 ) Total long-term debt $ 489,361 $ 447,892
Schedule of Maturities of Long-term Debt [Table Text Block]	(in thousands ) Scheduled Maturities 201 8 $ 6,250 201 9 6,250 20 20 6,250 202 1 6,250 202 2 122,500 202 3 and thereafter 352,992 $ 500,492

Note 7 - Fair Value of Assets30

Note 7 - Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Fair Value Measurements Using (in thousands ) Level 1 Level 2 Level 3 Total Investment in Polytronics $ 10,993 $ — $ — $ 10,993 Fair Value Measurements Using (in thousands ) Level 1 Level 2 Level 3 Total Investment in Polytronics $ 10,435 $ — $ — $ 10,435
Fair Value, by Balance Sheet Grouping [Table Text Block]	2017 2016 (in thousands ) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Euro Senior Notes, Series A due 2023 $ 139,623 $ 138,294 $ 122,313 $ 122,586 Euro Senior Notes, Series B due 2028 113,369 111,579 95,314 99,230 U .S. Senior Notes, Series A due 2022 25,000 24,737 25,000 24,746 U .S. Senior Notes, Series B due 2027 100,000 99,992 100,000 98,660
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]	Year Ended December 31, 2016 As of December 31, 2016 (in thousands ) Impairment Charge Fair Value Measurement (Level 3) Net Book Value Goodwill $ 8,794 $ — $ — Other intangible assets 6,015 680 660 Total $ 14,809 $ 680 $ 660
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]	(in thousands , except rates data ) Fair Value Valuation Technique Unobservable Inputs Rates Tradename $ 680 Relief from royalty Discount rate: 18% R oyalty rate: 1% Customer relationships $ — Excess earnings Discount rate: 18% Attrition rate: 5%

Note 8 - Benefit Plans (Tables)

Note 8 - Benefit Plans (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	(in thousands ) 2017 2016 Change in benefit obligation: Benefit obligation at beginning of year $ 55,606 $ 50,282 Service cost 2,037 1,509 Interest cost 1,887 1,662 Net actuarial loss (gain) (433 ) 10,190 Benefits paid from the trust (1,405 ) (2,329 ) Benefits paid directly by the Company (1,098 ) 250 Curtailments and settlements (31 ) (427 ) Acquisitions — 2,023 Effect of exchange rate movements 5,477 (7,554 ) Other 5,228 — Benefit obligation at end of year $ 67,268 $ 55,606 Change in plan assets at fair value: Fair value of plan assets at beginning of year $ 42,208 $ 44,629 Actual return on plan assets 2,962 6,929 Employer contributions 264 (126 ) Benefits paid (1,405 ) (2,329 ) Acquisitions — 24 Effect of exchange rate movements 4,094 (6,919 ) Fair value of plan assets at end of year 48,123 42,208 Net amount recognized/(unfunded status) $ (19,145 ) $ (13,398 ) (in thousands ) 2017 2016 Amounts recognized in the Consolidated Balance Sheet s consist of: Noncurrent assets $ 78 $ — Current benefit liability (481 ) — Noncurrent benefit liability (18,742 ) (13,398 ) Net liability recognized $ (19,145 ) $ (13,398 )
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	(in thousands ) 2017 2016 Net actuarial loss $ 12,261 $ 13,107 Prior service (cost) — — Net amount recognized , pre-tax $ 12,261 $ 13,107
Schedule of Net Benefit Costs [Table Text Block]	2015 (in thousands ) 2017 2016 U.S. Foreign Total Components of net periodic benefit cost: Service cost $ 2,037 $ 1,509 $ 750 $ 824 $ 1,574 Interest cost 1,887 1,662 3,093 1,735 4,828 Expected return on plan assets (1,990 ) (1,935 ) (2,749 ) (2,346 ) (5,095 ) Amortization of losses 337 306 870 221 1,091 Net periodic benefit cost 2,271 1,542 1,964 434 2,398 Curtailment/Settlement loss (gain) (25 ) (36 ) 29,928 — 29,928 Total expense (income) for the year $ 2,246 $ 1,506 $ 31,892 $ 434 $ 32,326
Schedule of Assumptions Used [Table Text Block]	2015 2017 2016 U.S. Foreign Discount rate 3.0 % 3.7 % 3.9 % 3.7 % Expected return on plan assets 4.5 % 4.9 % 6.8 % 5.1 % Compensation increase rate 4.5 % 5.3 % — 5.3 % Measurement dates 12/31/16 1/2/16 12/27/14 12/27/14 2017 201 6 201 5 Discount rate 3.1 % 2.6 % 3.8 % Compensation increase rate 5.0 % 4.5 % 6.2 % Measurement dates 12/ 30/17 12/31/16 1/ 2/16
Schedule of Net Funded Status [Table Text Block]	(in thousands ) 2017 2016 Projected benefit obligation $ 28,515 $ 48,985 Fair value of plan assets 9,292 42,179 (in thousands ) 2017 2016 Accumulated benefit obligation $ 18,990 $ 51,306 Fair value of plan assets 6,003 38,912
Schedule of Expected Benefit Payments [Table Text Block]	(in thousands ) Expected Benefit Payments 201 8 $ 2,467 201 9 2,474 20 20 2,473 202 1 2,802 202 2 2,776 2023-2027 16,777
Schedule of Allocation of Plan Assets [Table Text Block]	Asset Allocation 2017 201 6 Equity securities 35 % 32 % Debt securities 64 % 65 % Cash and equivalents 1 % 3 % 100 % 100 %
Pension Plan Assets Measured at Fair Value [Table Text Block]	Fair Value Measurements Usin g (in thousands ) Level 1 Level 2 L evel 3 NAV Total Equities: Global Equity 50:50 Index Fund $ — $ — $ — $ 7,898 $ 7,898 Global Equity 50:50 GBP Hedged Fund — — — 8,134 8,134 Philippine Stock 1,031 — — — 1,031 Fix ed income: Investment Grade Corporate Bond Funds 6,003 — — — 6,003 Over 15y Gilts Index Fund — — — 3,684 3,684 Active Corp Bond – Over 10 Yr Fund — — — 6,835 6,835 Over 5y Index-Linked Gilts Fund — — — 12,049 12,049 Philippine Long Gov ernment Securities 1,362 — — — 1,362 Philippine Long Corporate Bonds 723 — — — 723 Cash and equivalents 173 — — 231 404 Total pension plan assets $ 9,292 $ — $ — $ 38,831 $ 48,123 Fair Value Measurements Using (in thousands ) Level 1 Level 2 L evel 3 NAV Total Equities: Global Equity 50:50 Index Fund $ — $ — $ — $ 6,321 $ 6,321 Global Equity 50:50 GBP Hedged Fund — — — 6,406 6,406 Philippine Stock 906 — — — 906 Fixed income: Investment Grade Corporate Bond Funds 5,372 — — — 5,372 Over 15y Gilts Index Fund — — — 3,265 3,265 Active Corp Bond – Over 10 Yr Fund — — — 5,902 5,902 Over 5y Index-Linked Gilts Fund — — — 10,724 10,724 Philippine Long Gov ernment Securities 1,133 — — — 1,133 Philippine Long Corporate Bonds 751 — — — 751 Cash and equivalents 476 — — 952 1,428 Total pension plan assets $ 8,638 $ — $ — $ 33,570 $ 42,208

Note 9 - Shareholders' Equity (

Note 9 - Shareholders' Equity (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Share-based Compensation, Stock Options, Activity [Table Text Block]	Shares Under Option Weighted Average Price Weighted Average Remaining Contract Life (Years) Aggregate Intrinsic Value (000 ’s) Outstanding December 31, 2016 356,184 $ 98.65 Granted 76,082 154.15 Exercised (27,965 ) 84.93 Forfeited — NA Outstanding December 3 0, 2017 404,301 110.04 4.5 $ 35,488 Exercisable December 3 0, 2017 203,745 92.36 3.6 21,486
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	Shares Weighted Average Grant-Date Fair Value Nonvested December 31, 2016 207,330 $ 106.92 Granted 95,621 151.91 Vested (95,520 ) 102.49 Forfeited (7,738 ) 111.56 Nonvested December 3 0, 2017 199,693 130.40
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	2017 201 6 201 5 Weighted average fair value of options granted $30.77 $26.06 $21.99 Assumptions: Risk-free interest rate 1.79% 1.37% 1.25% Expected dividend yield 0.86% 0.97% 1.04% Expected stock price volatility 23.0% 26.0% 28.0% Expected life of options (years) 4.4 4.6 4.6
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	(in thousands ) Pension and postretirement liability and reclassification adjustments (a) Gain (Loss) on investments Foreign currency translation adjustment s Accumulated other comprehensive income (loss) Balance at December 27, 2014 $ (29,615 ) $ 10,791 $ (2,302 ) $ (21,126 ) 201 5 activity 20,893 793 (46,231 ) (24,545 ) Balance at January 2, 2016 (8,722 ) 11,584 (48,533 ) (45,671 ) 201 6 activity (3,261 ) (815 ) (24,832 ) (28,908 ) Balance at December 31, 2016 (11,983 ) 10,769 (73,365 ) (74,579 ) 2017 activity 1,147 (974 ) 10,738 10,911 Balance at December 30, 2017 $ (10,836 ) $ 9,795 $ (62,627 ) $ (63,668 )

Note 10 - Income Taxes (Tables)

Note 10 - Income Taxes (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	(in thousands ) 201 7 201 6 201 5 Domestic $ (20,496 ) $ (9,563 ) $ 1,313 Foreign 224,533 132,837 105,635 Income before income taxes $ 204,037 $ 123,274 $ 106,948 (in thousands ) 201 7 201 6 201 5 Current: Federal $ 34,060 $ (3,992 ) $ (6,686 ) State 450 (648 ) 2,078 Foreign 32,945 28,695 19,211 Subtotal 67,455 24,055 14,603 Deferred: Federal and State 16,562 (1,594 ) 11,330 Foreign 501 (3,675 ) 149 Subtotal 17,063 (5,269 ) 11,479 Provision for income taxes $ 84,518 $ 18,786 $ 26,082
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	(in thousands ) 201 7 201 6 201 5 Tax expense at statutory rate of 35% $ 71,413 $ 43,146 $ 37,432 Provisional amount of the Toll charge 49,000 — — Provisional Tax Act impact other than the Toll charge (1,962 ) — — State and local taxes, net of federal tax benefit 292 (415 ) 1,907 Non-U.S. income tax rate differential (47,077 ) (25,471 ) (18,253 ) Impairment of goodwill without tax benefit — 3,088 — Tax on unremitted earnings 12,202 2,747 — Mexico manufacturing operations restructuring — — 4,841 Nondeductible professional fees 1,240 313 1,011 Tax deduction for stock of foreign subsidiary — (3,896 ) — Other, net (590 ) (726 ) (856 ) Provision for income taxes $ 84,518 $ 18,786 $ 26,082
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	(in thousands) 2017 2016 Deferred tax assets: Accrued expenses $ 24,094 $ 31,770 Foreign tax credit carryforwards 1,053 6,472 Accrued restructuring 156 456 Capital losses 3,165 4,557 Domestic and foreign net operating loss carryforwards 5,778 2,223 Gross deferred tax assets 34,246 45,478 Less: Valuation allowance (6,203 ) (6,738 ) Total deferred tax assets 28,043 38,740 Deferred tax liabilities: Tax depreciation and amortization in excess of book 21,254 23,471 T ax on unremitted earnings 12,000 1,750 Total deferred tax liabilities 33,254 25,221 Net deferred tax (liabilities) assets $ (5,211 ) $ 13,519
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	(in thousands, except per share amounts ) Unrecognized Tax Benefits Balance at January 2, 2016 $ 3,532 Additions for tax positions taken in the current year 2,696 Additions for tax positions taken in the pre-acquisition periods of acquired subsidiaries 2,491 Settlements (102 ) Balance at December 31, 2016 $ 8,617 Additions for tax positions taken in the current year 370 Other (1,327 ) Balance at December 30, 2017 $ 7,660

Note 11 - Earnings Per Share (T

Note 11 - Earnings Per Share (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	(in thousands, except per share amounts ) 201 7 201 6 201 5 Numerator: Net income as reported $ 119,519 $ 104,488 $ 80,866 Denominator: Weighted average shares outstanding Basic 22,687 22,559 22,565 Effect of dilutive securities 244 168 154 Diluted 22,931 22,727 22,719 Earnings Per Share: Basic earnings per share $ 5.27 $ 4.63 $ 3.58 Diluted earnings per share $ 5.21 $ 4.60 $ 3.56

Note 12 - Segment Information (

Note 12 - Segment Information (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	(in thousands ) 201 7 201 6 201 5 Net sales Electronics $ 661,928 $ 535,191 $ 405,497 Automotive 453,227 415,200 339,957 Industrial 106,379 105,768 122,410 Total net sales $ 1,221,534 $ 1,056,159 $ 867,864 Depreciation and amortization Electronics $ 35,215 $ 29,141 $ 22,936 Automotive 22,459 18,107 13,437 Industrial 5,337 5,889 5,268 Total depreciation and amortization $ 63,011 $ 53,137 $ 41,641 Operating income (loss) Electronics $ 155,880 $ 117,088 $ 78,194 Automotive 62,571 59,905 53,086 Industrial 10,334 3,615 18,094 Other (a) (10,274 ) (49,964 ) (45,217 ) Total operating income 218,511 130,644 104,157 Interest expense 13,380 8,628 4,091 Foreign exchange loss (gain) 2,376 472 (1,465 ) Other (income) expense, net (1,282 ) (1,730 ) (5,417 ) Income before income taxes $ 204,037 $ 123,274 $ 106,948
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	(in thousands ) 201 7 201 6 201 5 Net sales United States $ 383,025 $ 356,674 $ 344,305 China 321,111 263,701 193,792 Other countries 517,398 435,784 329,767 Total net sales $ 1,221,534 $ 1,056,159 $ 867,864 Long-lived assets United States $ 23,490 $ 23,731 $ 23,965 China 86,310 65,345 37,241 Mexico 62,510 52,262 47,130 Philippines 31,129 33,345 33,525 Other countries 47,138 42,492 20,707 Total long-lived assets $ 250,577 $ 217,175 $ 162,568 Additions to long-lived assets United States $ 3,518 $ 4,694 $ 8,609 China 32,775 13,181 9,710 Mexico 19,395 15,667 9,193 Philippines 2,979 5,096 12,620 Other countries 7,258 7,590 3,887 Total additions to long-lived assets $ 65,925 $ 46,228 $ 44,019

Note 13 - Selected Quarterly 36

Note 13 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Quarterly Financial Information [Table Text Block]	(in thousands, except per share data ) 2017 2016 4Q (a) 3 Q (b ) 2 Q (c ) 1 Q (d ) 4Q (e ) 3 Q (f ) 2 Q (g ) 1 Q (h ) Net sales $ 304,849 $ 317,889 $ 313,355 $ 285,441 $ 284,518 $ 280,331 $ 271,912 $ 219,398 Gross profit 126,624 133,651 132,608 113,650 114,337 113,759 97,866 87,155 Operating income 50,780 58,609 60,270 48,852 40,988 27,526 29,702 32,428 Net income/(loss) (10,819 ) 42,808 48,638 38,891 27,245 30,802 27,152 19,289 Net income/(loss per share Basic $ (0.48 ) $ 1.88 $ 2.13 $ 1.71 $ 1.20 $ 1.36 $ 1.21 $ 0.86 Diluted $ (0.48 ) $ 1.87 $ 2.11 $ 1.69 $ 1.19 $ 1.35 $ 1.20 $ 0.85

Schedule II (Tables)

Schedule II (Tables)	12 Months Ended
	Dec. 30, 2017
Notes Tables
Summary of Valuation Allowance [Table Text Block]	Description Balance at Beginning of Year Charged to Costs and Expenses ( a) Deductions ( b ) Other ( c ) Balance at End of Year (in thousands ) Year ended December 3 0, 2017 Allowance for losses on accounts receivable $ 2,079 $ 3,068 $ (4,070 ) $ 95 $ 1,172 Reserves for sales discounts and allowances $ 23,825 $ 106,781 $ (104,941 ) $ 679 $ 26,344 Deferred tax valuation allowance $ 6,738 $ — $ — $ (535 ) $ 6,203 Year ended December 31, 2016 Allowance for losses on accounts receivable $ 319 $ 1,769 $ (42 ) $ 33 $ 2,079 Reserves for sales discounts and allowances $ 17,168 $ 91,632 $ (90,837 ) $ 5,862 $ 23,825 Deferred tax valuation allowance $ 4,557 $ — $ — $ 2,181 $ 6,738 Year ended January 2, 2016 Allowance for losses on accounts receivable $ 278 $ 164 $ 150 $ 27 $ 319 Reserves for sales discounts and allowances $ 19,140 $ 81,335 $ 82,997 $ (310 ) $ 17,168 Deferred tax valuation allowance $ 4,557 $ — $ — $ — $ 4,557

Note 1 - Summary of Significa38

Note 1 - Summary of Significant Accounting Policies and Other Information (Details Textual) $ in Thousands, € in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2017USD ($)	Dec. 29, 2018	Dec. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 02, 2016USD ($)	Dec. 30, 2017EUR (€)	Oct. 01, 2017	Dec. 31, 2016EUR (€)
Number of Reporting Units			7
Finite-Lived Intangible Asset, Useful Life
Foreign Currency Transaction Gain (Loss), before Tax			$ (2,376)	$ (472)	$ 1,465
Loss Contingency, Accrual, Noncurrent	$ 1,100		$ 1,100	$ 1,500		€ 0.9		€ 1.4
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	47,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Toll Charge	49,000		$ 49,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Other Than Toll Charge	(2,000)		(1,962)
Income Tax Expense (Benefit)			84,518	18,786	26,082
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)			2,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Selling, General and Administrative Expenses [Member]
Advertising Expense			2,900	2,900	2,300
Shipping, Handling and Transportation Costs			$ 10,900	$ 9,100	$ 7,000
Patents, Licenses, and Software [Member]
Finite-Lived Intangible Asset, Useful Life			11 years 146 days	11 years 146 days
Distribution Rights [Member]
Finite-Lived Intangible Asset, Useful Life			12 years 36 days	12 years 36 days
Electronics Non Silicon Unit [Member]
Excess Of Fair Value Over Carrying Value Of Invested Capital							161.00%
Electronics (Silicon) Unit [Member]
Excess Of Fair Value Over Carrying Value Of Invested Capital							314.00%
Passenger Car [Member]
Excess Of Fair Value Over Carrying Value Of Invested Capital							247.00%
Commercial Vehicle Products [Member]
Excess Of Fair Value Over Carrying Value Of Invested Capital							21800.00%
Sensors [Member]
Excess Of Fair Value Over Carrying Value Of Invested Capital							10000.00%
Relay Unit [Member]
Excess Of Fair Value Over Carrying Value Of Invested Capital							2500.00%
Fuse Unit [Member]
Excess Of Fair Value Over Carrying Value Of Invested Capital							24800.00%
Custom Products Reporting Unit [Member] | Industrial [Member]
Impairment of Intangible Assets (Excluding Goodwill)				$ 6,015
Custom Products Reporting Unit [Member] | Customer Relationships [Member] | Industrial [Member]
Impairment of Intangible Assets (Excluding Goodwill)				2,200
Custom Products Reporting Unit [Member] | Trade Names [Member] | Industrial [Member]
Impairment of Intangible Assets (Excluding Goodwill)				$ 3,800
Minimum [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life			5 years
Minimum [Member] | Patents, Licenses, and Software [Member]
Finite-Lived Intangible Asset, Useful Life			5 years
Minimum [Member] | Distribution Rights [Member]
Finite-Lived Intangible Asset, Useful Life			3 years
Maximum [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life			20 years
Maximum [Member] | Patents, Licenses, and Software [Member]
Finite-Lived Intangible Asset, Useful Life			17 years
Maximum [Member] | Distribution Rights [Member]
Finite-Lived Intangible Asset, Useful Life			20 years
Building [Member]
Property, Plant and Equipment, Useful Life			21 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life			7 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life			9 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life			7 years
Tools, Dies and Molds [Member]
Property, Plant and Equipment, Useful Life			5 years
Computer Equipment [Member]
Property, Plant and Equipment, Useful Life			3 years
Other Noncurrent Assets [Member]
Marketable Securities	$ 8,000		$ 8,000
Polytronics [Member]
Long-term Investment, Ownership Percentage	7.20%		7.20%	7.20%		7.20%		7.20%
Marketable Securities, Equity Securities	$ 11,000		$ 11,000	$ 10,400		€ 9.2		€ 10
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax			$ (1,000)	$ (800)

Note 2 - Acquisitions and Dis39

Note 2 - Acquisitions and Dispositions (Details Textual) $ / shares in Units, $ in Thousands

Jan. 17, 2018USD ($)$ / shares

Jul. 07, 2017USD ($)

Mar. 01, 2017USD ($)

Feb. 28, 2017USD ($)

Aug. 29, 2016USD ($)

Apr. 04, 2016USD ($)

Mar. 25, 2016USD ($)

Oct. 01, 2015USD ($)

Jan. 17, 2018USD ($)$ / shares

Dec. 30, 2017USD ($)$ / shares

Dec. 31, 2016USD ($)$ / shares

Jan. 02, 2016USD ($)

Dec. 31, 2015USD ($)

Common Stock, Par or Stated Value Per Share | $ / shares

$ 0.01

$ 0.01

Finite-Lived Intangible Asset, Useful Life

Goodwill, Acquired During Period

$ 36,716

[1]

$ 232,934

[2]

Gain (Loss) on Disposition of Business

(1,391)

Marine Product Line [Member}

Gain (Loss) on Disposition of Business

1,400

Electronics [Member]

Goodwill, Acquired During Period

$ 103,800

36,716

[1]

162,172

[2]

Automotive [Member]

Goodwill, Acquired During Period

61,300

[1]

70,762

[2]

Trademarks and Trade Names [Member] | Minimum [Member]

Finite-Lived Intangible Asset, Useful Life

5 years

Trademarks and Trade Names [Member] | Maximum [Member]

Finite-Lived Intangible Asset, Useful Life

20 years

Monolith [Member]

Cost Method Investments

3,500

$ 3,500

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

12.00%

U.S. Sensor [Member]

Payments to Acquire Businesses, Gross

$ 24,340

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables

1,500

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory

$ 1,600

Monolith [Member]

Business Combination, Consideration Transferred

$ 15,000

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables

$ 700

Business Acquisition, Percentage of Voting Interests Acquired

62.00%

Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low

$ 1,000

Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High

10,000

Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value

$ 3,500

$ 3,500

ON Portfolio [Member]

Payments to Acquire Businesses, Gross

$ 104,000

Business Combination, Consideration Transferred

104,000

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory

700

Business Acquisition, Goodwill, Expected Tax Deductible Amount

$ 7,300

Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual

21,800

ON Portfolio [Member] | Customer Relationships [Member]

Finite-Lived Intangible Asset, Useful Life

13 years 182 days

ON Portfolio [Member] | Patented and Unpatented Technologies [Member] | Minimum [Member]

Finite-Lived Intangible Asset, Useful Life

6 years

ON Portfolio [Member] | Patented and Unpatented Technologies [Member] | Maximum [Member]

Finite-Lived Intangible Asset, Useful Life

8 years 182 days

ON Portfolio [Member] | Noncompete Agreements [Member]

Finite-Lived Intangible Asset, Useful Life

4 years

Menber's S.p.A. [Member]

Business Combination, Consideration Transferred

$ 19,200

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory

$ 200

Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual

17,300

Menber's S.p.A. [Member] | Customer Relationships [Member]

Finite-Lived Intangible Asset, Useful Life

10 years

Menber's S.p.A. [Member] | Patented and Unpatented Technologies [Member]

Finite-Lived Intangible Asset, Useful Life

5 years

Menber's S.p.A. [Member] | Trademarks and Trade Names [Member]

Finite-Lived Intangible Asset, Useful Life

10 years

PolySwitch [Member]

Business Combination, Consideration Transferred

348,292

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory

$ 6,900

Business Acquisition, Percentage of Voting Interests Acquired

100.00%

Business Acquisition, Goodwill, Expected Tax Deductible Amount

$ 64,900

Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual

$ 126,500

PolySwitch [Member] | Customer Relationships [Member]

Finite-Lived Intangible Asset, Useful Life

15 years

PolySwitch [Member] | Patented and Unpatented Technologies [Member]

Finite-Lived Intangible Asset, Useful Life

10 years

Sigmar [Member]

Payments to Acquire Businesses, Gross

$ 5,558

Business Combination, Consideration Transferred

$ 6,459

Business Acquisition, Percentage of Voting Interests Acquired

100.00%

Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High

$ 900

Subsequent Event [Member]

Share Price | $ / shares

$ 207.50

$ 207.50

Subsequent Event [Member] | IXYS Corporation [Member]

Business Acquisition, Share Price | $ / shares

$ 23

$ 23

Business Acquisition, Share Exchange Ratio

0.1265

0.1265

Business Combination, Consideration Transferred, Excluding Value of Stock Options Converted

$ 814,800

Payments to Acquire Businesses, Gross

$ 380,500

Business Combination, Consideration Transferred, Equity Interests Issued and Issuable

434,200

Business Combination, Value of Stock Options Converted to Company’s Stock Options

41,700

Business Combination, Consideration Transferred

$ 856,500

IXYS Corporation [Member] | Subsequent Event [Member]

Number of Customers

3,500

Common Stock, Par or Stated Value Per Share | $ / shares

$ 0.01

$ 0.01

[1]

The 2017 additions resulted from the acquisitions of U.S. Sensor and Monolith.

[2]

The 2016 additions resulted primarily from the acquisitions of PolySwitch, ON and Menber's.

Note 2 - Acquisitions and Dis40

Note 2 - Acquisitions and Dispositions - Preliminary Price Allocation (Details) - USD ($) $ in Thousands	Jul. 07, 2017	Mar. 01, 2017	Feb. 28, 2017	Aug. 29, 2016	Apr. 04, 2016	Mar. 25, 2016	Oct. 01, 2015	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Goodwill								$ 453,414	$ 403,544	$ 189,767
Cash, net of cash acquired								$ 38,512	$ 471,118	$ 4,558
U.S. Sensor [Member]
Cash	$ 24,340
Current assets, net	4,635
Goodwill	16,075
Current liabilities	(540)
	24,340
Payments to Acquire Businesses, Gross	24,340
U.S. Sensor [Member] | Patented and Unpatented Technologies [Member]
Intangible assets, other than goodwill	1,090
U.S. Sensor [Member] | Customer Relationships [Member]
Intangible assets, other than goodwill	2,830
U.S. Sensor [Member] | Trademarks and Trade Names [Member]
Intangible assets, other than goodwill	200
U.S. Sensor [Member] | Noncompete Agreements [Member]
Intangible assets, other than goodwill	$ 50
Monolith [Member]
Current assets, net		$ 891
Goodwill		20,641
Current liabilities		(639)
Original investment		3,500	$ 3,500
Cash, net of cash acquired		14,172
Fair value of commitment to purchase non-controlling interest		9,000
Total purchase consideration		26,672
Property, plant, and equipment		789
Other non-current liabilities		(1,870)
		26,672
Total purchase consideration			$ 15,000
Monolith [Member] | Patented and Unpatented Technologies [Member]
Intangible assets, other than goodwill		6,720
Monolith [Member] | Noncompete Agreements [Member]
Intangible assets, other than goodwill		$ 140
ON Portfolio [Member]
Cash				$ 104,000
Current assets, net				4,816
Goodwill				56,084
				104,000
Total purchase consideration				104,000
Payments to Acquire Businesses, Gross				104,000
ON Portfolio [Member] | Patented and Unpatented Technologies [Member]
Intangible assets, other than goodwill				8,800
ON Portfolio [Member] | Customer Relationships [Member]
Intangible assets, other than goodwill				31,800
ON Portfolio [Member] | Noncompete Agreements [Member]
Intangible assets, other than goodwill				$ 2,500
Menber's S.p.A. [Member]
Current assets, net					$ 12,919
Goodwill					8,091
Current liabilities					(7,220)
					19,162
Cash, net of cash acquired					19,162
Property, plant, and equipment					1,693
Other non-current liabilities					(1,444)
Total purchase consideration					19,200
Menber's S.p.A. [Member] | Patented and Unpatented Technologies [Member]
Intangible assets, other than goodwill					224
Menber's S.p.A. [Member] | Customer Relationships [Member]
Intangible assets, other than goodwill					3,050
Menber's S.p.A. [Member] | Trademarks and Trade Names [Member]
Intangible assets, other than goodwill					$ 1,849
PolySwitch [Member]
Current assets, net						$ 60,228
Goodwill						165,088
Current liabilities						(35,280)
						348,292
Property, plant, and equipment						51,613
Other non-current liabilities						(5,020)
Original consideration						350,000
Post closing consideration adjustment received						(1,708)
Acquired cash						(3,810)
Acquired cash to be returned to seller						3,810
Total purchase consideration						348,292
Land lease						4,290
Other long-term assets						11,228
Estimated additional consideration payable						3,810
PolySwitch [Member] | Patented and Unpatented Technologies [Member]
Intangible assets, other than goodwill						56,425
PolySwitch [Member] | Customer Relationships [Member]
Intangible assets, other than goodwill						$ 39,720
Sigmar [Member]
Cash							$ 5,558
Current assets, net							2,519
Goodwill							4,084
Current liabilities							(1,518)
							6,459
Property, plant, and equipment							1,097
Other non-current liabilities							(2,568)
Acquired cash to be returned to seller							901
Total purchase consideration							6,459
Payments to Acquire Businesses, Gross							5,558
Estimated additional consideration payable							901
Sigmar [Member] | Patents [Member]
Intangible assets, other than goodwill							$ 2,845

Note 2 - Acquisitions and Dis41

Note 2 - Acquisitions and Dispositions - Business Acquisition Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Net sales	$ 1,130,645	$ 1,104,838
Income before income taxes	143,110	120,370
Net income	$ 124,388	$ 92,983
Net income per share — basic (in dollars per share)	$ 5.51	$ 4.12
Net income per share — diluted (in dollars per share)	$ 5.47	$ 4.09

Note 3 - Inventories - Componen

Note 3 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Raw materials	$ 39,030	$ 32,231
Work in process	27,454	23,354
Finished goods	74,305	58,478
Total	$ 140,789	$ 114,063

Note 4 - Goodwill and Other I43

Note 4 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Goodwill, Impairment Loss	[1]		$ 8,794
Impairment of Intangible Assets, Finite-lived			6,000
Finite-lived Intangible Assets Acquired		$ 11,030	144,368
Amortization of Intangible Assets		24,700	19,337	$ 11,898
Industrial [Member]
Goodwill, Impairment Loss			8,794
Goodwill Error Correction Adjustments		(4,800)
Industrial [Member] | Customer Relationships [Member]
Impairment of Intangible Assets, Finite-lived			2,200
Industrial [Member] | Trade Names [Member]
Impairment of Intangible Assets, Finite-lived			3,800
Electronics [Member]
Goodwill, Impairment Loss	[1]
Goodwill Error Correction Adjustments		21,600
Automotive [Member]
Goodwill, Impairment Loss	[1]
Goodwill Error Correction Adjustments		$ (16,800)
[1]	The 2016 impairments in the Industrial segment was due to the $8.8 million impairment of Custom Products reporting unit goodwill.

Note 4 - Goodwill and Other I44

Note 4 - Goodwill and Other Intangible Assets - Amounts for Goodwill and Changes in Carrying Value by Operating Segment (Details) - USD ($) $ in Thousands		Mar. 25, 2016	Dec. 30, 2017		Dec. 31, 2016
Balance			$ 403,544		$ 189,767
Additions			36,716	[1]	232,934	[2]
Impairments	[3]				(8,794)
Adjustments	[4]				(10,363)
Adjustments	[5]		13,154
Balance			453,414		403,544
Electronics [Member]
Balance			215,765		58,246
Additions		$ 103,800	36,716	[1]	162,172	[2]
Impairments	[3]
Adjustments	[4]				(4,653)
Adjustments	[5]		26,478
Balance			278,959		215,765
Automotive [Member]
Balance			144,585		80,262
Additions		$ 61,300		[1]	70,762	[2]
Impairments	[3]
Adjustments	[4]				(6,439)
Adjustments	[5]		(8,756)
Balance			135,829		144,585
Industrial [Member]
Balance			43,194		51,259
Additions				[1]		[2]
Impairments					(8,794)
Adjustments	[4]				729
Adjustments	[5]		(4,568)
Balance			$ 38,626		$ 43,194
[1]	The 2017 additions resulted from the acquisitions of U.S. Sensor and Monolith.
[2]	The 2016 additions resulted primarily from the acquisitions of PolySwitch, ON and Menber's.
[3]	The 2016 impairments in the Industrial segment was due to the $8.8 million impairment of Custom Products reporting unit goodwill.
[4]	Adjustments in 2016 reflect the impact of changes in foreign exchange rates.
[5]	Adjustments in 2017 reflect adjustments to correct goodwill by segment as well as the impact of changes in foreign exchange rates. The impact of the corrections was an increase in goodwill to the Electronics segment of $21.6 million and a decrease of goodwill of $16.8 million and $4.8 million to the Automotive segment and the Industrial segment, respectively.

Note 4 - Goodwill and Other I45

Note 4 - Goodwill and Other Intangible Assets - Details of Other Intangible Assets and Related Future Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Asset, Useful Life
Finite-lived intangible assets, gross	$ 350,432	$ 331,648
Finite-lived intangible assets, accumulated amortization	146,582	118,622
Finite-lived intangible assets, Net Book Value	203,850	213,026
Finite-lived Intangible Assets Acquired	$ 11,030	$ 144,368
Patents, Licenses, and Software [Member]
Finite-Lived Intangible Asset, Useful Life	11 years 146 days	11 years 146 days
Finite-lived intangible assets, gross	$ 141,520	$ 131,611
Finite-lived intangible assets, accumulated amortization	59,609	48,004
Finite-lived intangible assets, Net Book Value	$ 81,911	$ 83,607
Finite-lived intangible assets, useful life (Year)	9 years 219 days	9 years 219 days
Finite-lived Intangible Assets Acquired	$ 7,810	$ 65,449
Distribution Rights [Member]
Finite-Lived Intangible Asset, Useful Life	12 years 36 days	12 years 36 days
Finite-lived intangible assets, gross	$ 46,233	$ 49,150
Finite-lived intangible assets, accumulated amortization	33,361	30,155
Finite-lived intangible assets, Net Book Value	$ 12,872	$ 18,995
Customer Lists, Trademarks, and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life	15 years 219 days	14 years 146 days
Finite-lived intangible assets, gross	$ 162,679	$ 150,887
Finite-lived intangible assets, accumulated amortization	53,612	40,463
Finite-lived intangible assets, Net Book Value	$ 109,067	$ 110,424
Finite-lived intangible assets, useful life (Year)	9 years	13 years 182 days
Finite-lived Intangible Assets Acquired	$ 3,220	$ 78,919

Note 4 - Goodwill and Other I46

Note 4 - Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Intangible Assets with Definite Lives (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
2,018	$ 25,689
2,019	25,528
2,020	24,879
2,021	23,093
2,022	22,058
2023 and thereafter	82,603
	$ 203,850	$ 213,026

Note 5 - Lease Commitments (Det

Note 5 - Lease Commitments (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Operating Leases, Rent Expense	$ 11.6	$ 12.6	$ 11.1

Note 5 - Lease Commitments - Fu

Note 5 - Lease Commitments - Future Minimum Payments for All Non-cancelable Operating Leases (Details) $ in Thousands	Dec. 30, 2017USD ($)
2,018	$ 10,842
2,019	6,194
2,020	5,425
2,021	4,632
2,022	3,464
2023 and thereafter	5,021
	$ 35,578

Note 6 - Debt (Details Textual)

Note 6 - Debt (Details Textual) $ in Thousands, € in Millions, ¥ in Millions	Jan. 16, 2018USD ($)	Oct. 13, 2017USD ($)	Mar. 04, 2016USD ($)	Dec. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 02, 2016USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2020USD ($)	Nov. 15, 2017USD ($)	Oct. 12, 2017USD ($)	Feb. 15, 2017USD ($)	Dec. 08, 2016USD ($)	Dec. 08, 2016EUR (€)	Dec. 27, 2014USD ($)	Dec. 27, 2014CNY (¥)
Payments of Debt Issuance Costs				$ 1,626	$ 3,583	$ 42
Interest Paid				13,400	$ 8,600	$ 4,100
Bank of America [Member]
Payments of Debt Issuance Costs				$ 2,600
Euro Senior Notes, Series A and B [Member]
Debt Instrument, Face Amount | €													€ 212
Euro Senior Notes, Series A [Member]
Debt Instrument, Face Amount												$ 117,000
Debt Instrument, Interest Rate, Stated Percentage												1.14%	1.14%
Euro Senior Notes, Series B [Member]
Debt Instrument, Face Amount | €													€ 95
Debt Instrument, Interest Rate, Stated Percentage												1.83%	1.83%
U.S. Senior Notes, Series A and B [Member]
Debt Instrument, Face Amount												$ 125,000
U.S. Senior Notes, Series A [Member]
Debt Instrument, Face Amount											$ 25,000
Debt Instrument, Interest Rate, Stated Percentage											3.03%
U.S. Senior Notes, Series B [Member]
Debt Instrument, Face Amount											$ 100,000
Debt Instrument, Interest Rate, Stated Percentage											3.74%
US Senior Notes A and B Due 2025 and 2030 [Member]
Debt Instrument, Face Amount									$ 175,000
Entrustment Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage														5.25%	5.25%
Entrusted Loan														$ 17,900	¥ 110
Subsequent Event [Member] | US Senior Notes A Due 2025 [Member]
Debt Instrument, Face Amount	$ 50,000
Debt Instrument, Interest Rate, Stated Percentage	3.48%
Subsequent Event [Member] | US Senior Notes B Due 2030 [Member]
Debt Instrument, Face Amount	$ 125,000
Debt Instrument, Interest Rate, Stated Percentage	3.78%
Credit Agreement [Member]
Debt Instrument, Term			5 years
Debt Agreement, Maximum Borrowing Capacity			$ 700,000
Line of Credit Facility, Additional Uncommitted Borrowing Capacity		$ 300,000	150,000
Line of Credit Facility, Additional Uncommitted Borrowing Capacity, Minimum Increments			$ 25,000
Number of Advances		2
Debt Instrument, Interest Rate, Effective Percentage				3.07%
Letters of Credit Outstanding, Amount				$ 100
Credit Agreement [Member] | Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.15%
Credit Agreement [Member] | Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.25%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate			2.00%
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate			0.00%
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Credit Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 700,000	$ 575,000							$ 575,000
Line of Credit Facility, Remaining Borrowing Capacity				$ 699,900
Credit Agreement [Member] | Term Loan Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		200,000	$ 125,000							$ 125,000
Proceeds from Issuance of Long-term Debt		$ 125,000
Debt Instrument, Quarterly Payments, Percentage of Loan				1.25%
Debt Instrument, Periodic Payment				$ 1,600
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Subsequent Event [Member]
Proceeds from Issuance of Long-term Debt	$ 75,000
Debt Instrument, Periodic Payment	$ 2,500
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Scenario, Forecast [Member]
Line of Credit Facility, Periodic Payment, Principal							$ 1,600	$ 3,100
Bank of America [Member]
Payments of Debt Issuance Costs				$ 1,600

Note 6 - Debt - Carrying Amount

Note 6 - Debt - Carrying Amounts of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Debt, carrying amount	$ 500,492
Unamortized debt issuance costs	(4,881)	$ (3,820)
Total debt	495,611	454,142
Less: Current maturities	6,250	6,250
Total long-term debt	489,361	447,892
Line of Credit [Member]
Debt, carrying amount		112,500
Unsecured Debt [Member]
Debt, carrying amount	122,500	120,313
Entrustment Loan [Member]
Debt, carrying amount		3,522
Euro Senior Notes, Series A [Member]
Debt, carrying amount	139,623	122,313
Euro Senior Notes, Series B [Member]
Debt, carrying amount	113,369	99,314
US Senior Notes A Due 2022 [Member]
Debt, carrying amount	25,000
US Senior Notes B Due 2027 [Member]
Debt, carrying amount	$ 100,000

Note 6 - Debt - Scheduled Matur

Note 6 - Debt - Scheduled Maturities of the Company's Long Term Debt (Details) $ in Thousands	Dec. 30, 2017USD ($)
2,018	$ 6,250
2,019	6,250
2,020	6,250
2,021	6,250
2,022	122,500
2023 and thereafter	352,992
	$ 500,492

Note 7 - Fair Value of Assets52

Note 7 - Fair Value of Assets and Liabilities (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 30, 2017	Jan. 02, 2016
Intangible Assets, Net (Excluding Goodwill)	$ 213,027	$ 203,850
Goodwill	403,544	453,414	$ 189,767
Industrial [Member]
Goodwill	43,194	38,626	$ 51,259
Industrial [Member] | Custom Products Reporting Unit [Member]
Impairment of Intangible Assets (Excluding Goodwill)	6,015
Goodwill	0
Industrial [Member] | Custom Products Reporting Unit [Member] | Trade Names [Member]
Impairment of Intangible Assets (Excluding Goodwill)	3,800
Intangible Assets, Net (Excluding Goodwill)	700
Industrial [Member] | Custom Products Reporting Unit [Member] | Customer Relationships [Member]
Impairment of Intangible Assets (Excluding Goodwill)	2,200
Intangible Assets, Net (Excluding Goodwill)	0
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0

Note 7 - Fair Value of Assets53

Note 7 - Fair Value of Assets and Liabilities - Assets Measured at Fair Value (Details) - Polytronics [Member] - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Investment in Polytronics	$ 10,993	$ 10,435
Fair Value, Inputs, Level 1 [Member]
Investment in Polytronics	10,993	10,435
Fair Value, Inputs, Level 2 [Member]
Investment in Polytronics
Fair Value, Inputs, Level 3 [Member]
Investment in Polytronics

Note 7 - Fair Value of Assets54

Note 7 - Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value of Senior Notes (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Euro Senior Notes, Series A [Member] | Reported Value Measurement [Member]
Senior Notes, Fair Value	$ 139,623	$ 122,313
Euro Senior Notes, Series A [Member] | Estimate of Fair Value Measurement [Member]
Senior Notes, Fair Value	138,294	122,586
Euro Senior Notes, Series B [Member] | Reported Value Measurement [Member]
Senior Notes, Fair Value	113,369	95,314
Euro Senior Notes, Series B [Member] | Estimate of Fair Value Measurement [Member]
Senior Notes, Fair Value	111,579	99,230
US Senior Notes A Due 2022 [Member] | Reported Value Measurement [Member]
Senior Notes, Fair Value	25,000	25,000
US Senior Notes A Due 2022 [Member] | Estimate of Fair Value Measurement [Member]
Senior Notes, Fair Value	24,737	24,746
US Senior Notes B Due 2027 [Member] | Reported Value Measurement [Member]
Senior Notes, Fair Value	100,000	100,000
US Senior Notes B Due 2027 [Member] | Estimate of Fair Value Measurement [Member]
Senior Notes, Fair Value	$ 99,992	$ 98,660

Note 7 - Fair Value of Assets55

Note 7 - Fair Value of Assets and Liabilities - Impairment of Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Goodwill, impairment charge	[1]		$ 8,794
Goodwill		$ 453,414	403,544	$ 189,767
Other intangible assets		203,850	213,026
Impairment of goodwill and intangible assets			14,809
Industrial [Member]
Goodwill, impairment charge			8,794
Goodwill		$ 38,626	43,194	$ 51,259
Industrial [Member] | Custom Products Reporting Unit [Member]
Goodwill, impairment charge			8,794
Goodwill			0
Other intangible assets, impairment charge			6,015
Other intangible assets			660
Impairment of goodwill and intangible assets			14,809
Total			660
Industrial [Member] | Custom Products Reporting Unit [Member] | Fair Value, Inputs, Level 3 [Member]
Goodwill
Other intangible assets			680
Total			$ 680
[1]	The 2016 impairments in the Industrial segment was due to the $8.8 million impairment of Custom Products reporting unit goodwill.

Note 7 - Fair Value of Assets56

Note 7 - Fair Value of Assets and Liabilities - Level 3 Measurements (Details) - Industrial [Member] - Custom Products Reporting Unit [Member] - Fair Value, Inputs, Level 3 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Trade Names [Member]
Fair value	$ 680
Trade Names [Member] | Relief From Royalty [Member]
Discount rate	18.00%
Royalty rate	1.00%
Customer Relationships [Member]
Fair value
Customer Relationships [Member] | Excess Earnings [Member]
Discount rate	18.00%
Attrition rate	5.00%

Note 8 - Benefit Plans (Details

Note 8 - Benefit Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Premium Refund of Annuity Contract	$ 300			$ 300
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement					$ (29,928)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year			300
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year			1,400
Other Assets [Member]
Defined Contribution Plan, Plan Assets			8,000
Other Long-term Liabilities [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability			$ 8,000
401(K) Savings Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			4.00%
Defined Contribution Plan, Employer Discretionary Matching Contribution, Percent of Employees' Gross Pay			2.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 3,500	$ 3,200	$ 2,800
Foreign Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			4.50%
Pension Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			4.50%	4.90%
Pension Plan [Member] | UNITED STATES
Payment for Pension Benefits		$ 9,100
Define Benefit Plan, Pre-tax Settlement Charge		$ 30,200
Defined Benefit Plan, Accumulated Benefit Obligation			$ 60,500	$ 51,300
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets					6.80%
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets					5.10%
Supplemental Employee Retirement Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 300

Note 8 - Benefit Plans - Benefi

Note 8 - Benefit Plans - Benefit Plan Related Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Change in benefit obligation:
Service cost	$ 2,037	$ 1,509	$ 1,574
Interest cost	1,887	1,662	4,828
Change in plan assets at fair value:
Fair value of plan assets at beginning of year	42,208
Fair value of plan assets at end of year	48,123	42,208
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent benefit liability	(18,742)	(13,398)
Pension Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	55,606	50,282
Service cost	2,037	1,509
Interest cost	1,887	1,662
Net actuarial loss (gain)	(433)	10,190
Benefits paid from the trust	(1,405)	(2,329)
Benefits paid directly by the Company	(1,098)	250
Curtailments and settlements	(31)	(427)
Acquisitions		2,023
Effect of exchange rate movements	5,477	(7,554)
Other	5,228
Benefit obligation at end of year	67,268	55,606	50,282
Change in plan assets at fair value:
Fair value of plan assets at beginning of year	42,208	44,629
Actual return on plan assets	2,962	6,929
Employer contributions	264
Employer contributions		(126)
Benefits paid	(1,405)	(2,329)
Acquisitions		24
Effect of exchange rate movements	4,094	(6,919)
Fair value of plan assets at end of year	48,123	42,208	$ 44,629
Net amount recognized/(unfunded status)	(19,145)	(13,398)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent assets	78
Current benefit liability	(481)
Noncurrent benefit liability	(18,742)	(13,398)
Net liability recognized	$ (19,145)	$ (13,398)

Note 8 - Benefit Plans - Amount

Note 8 - Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Pre-tax (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Net actuarial loss	$ 12,261	$ 13,107
Prior service (cost)
Net amount recognized, pre-tax	$ 12,261	$ 13,107

Note 8 - Benefit Plans - Bene60

Note 8 - Benefit Plans - Benefit Plan Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Components of net periodic benefit cost:
Service cost	$ 2,037	$ 1,509	$ 1,574
Interest cost	1,887	1,662	4,828
Expected return on plan assets	(1,990)	(1,935)	(5,095)
Amortization of losses	337	306	1,091
Net periodic benefit cost	2,271	1,542	2,398
Curtailment/Settlement loss (gain)	(25)	(36)	29,928
Total expense (income) for the year	$ 2,246	$ 1,506	32,326
UNITED STATES
Components of net periodic benefit cost:
Service cost			750
Interest cost			3,093
Expected return on plan assets			(2,749)
Amortization of losses			870
Net periodic benefit cost			1,964
Curtailment/Settlement loss (gain)			29,928
Total expense (income) for the year			31,892
Foreign Plan [Member]
Components of net periodic benefit cost:
Service cost			824
Interest cost			1,735
Expected return on plan assets			(2,346)
Amortization of losses			221
Net periodic benefit cost			434
Curtailment/Settlement loss (gain)
Total expense (income) for the year			$ 434

Note 8 - Benefit Plans - Weight

Note 8 - Benefit Plans - Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Foreign Plan [Member]
Expected return on plan assets	4.50%
Pension Plan [Member]
Discount rate	3.00%	3.70%
Expected return on plan assets	4.50%	4.90%
Compensation increase rate	4.50%	5.30%
Measurement dates	Dec. 31, 2016	Jan. 2, 2016
Discount rate	3.10%	2.60%	3.80%
Compensation increase rate	5.00%	4.50%	6.20%
Measurement dates	Dec. 30, 2017	Dec. 31, 2016	Jan. 2, 2016
Pension Plan [Member] | UNITED STATES
Discount rate			3.90%
Expected return on plan assets			6.80%
Measurement dates			Dec. 27, 2014
Pension Plan [Member] | Foreign Plan [Member]
Discount rate			3.70%
Expected return on plan assets			5.10%
Compensation increase rate			5.30%
Measurement dates			Dec. 27, 2014

Note 8 - Benefit Plans - Funded

Note 8 - Benefit Plans - Funded Status of Plans (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Projected benefit obligation	$ 28,515	$ 48,985
Fair value of plan assets	9,292	42,179
Accumulated benefit obligation	18,990	51,306
Fair value of plan assets	$ 6,003	$ 38,912

Note 8 - Benefit Plans - Expect

Note 8 - Benefit Plans - Expected Benefit Payments to Be Paid to Participants (Details) $ in Thousands	Dec. 30, 2017USD ($)
2,018	$ 2,467
2,019	2,474
2,020	2,473
2,021	2,802
2,022	2,776
2023-2027	$ 16,777

Note 8 - Benefit Plans - Alloca

Note 8 - Benefit Plans - Allocation of Plan Assets (Details) - Pension Plan [Member]	Dec. 30, 2017	Dec. 31, 2016
Asset Allocations	100.00%	100.00%
Equity Securities [Member]
Asset Allocations	35.00%	32.00%
Debt Securities [Member]
Asset Allocations	64.00%	65.00%
Cash and Cash Equivalents [Member]
Asset Allocations	1.00%	3.00%

Note 8 - Benefit Plans - The Co

Note 8 - Benefit Plans - The Company's Pension Plan Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Total pension plan assets	$ 48,123	$ 42,208
Cash and Cash Equivalents [Member]
Total pension plan assets	404	1,428
Fair Value, Inputs, Level 1 [Member]
Total pension plan assets	9,292	8,638
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Total pension plan assets	173	476
Fair Value, Inputs, Level 2 [Member]
Total pension plan assets
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Total pension plan assets
Fair Value, Inputs, Level 3 [Member]
Total pension plan assets
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Total pension plan assets
Fair Value Measured at Net Asset Value Per Share [Member]
Total pension plan assets	38,831	33,570
Fair Value Measured at Net Asset Value Per Share [Member] | Cash and Cash Equivalents [Member]
Total pension plan assets	231	952
Global Equity Index Fund [Member] | Equity Securities [Member]
Total pension plan assets	7,898	6,321
Global Equity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Total pension plan assets
Global Equity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Total pension plan assets
Global Equity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Total pension plan assets
Global Equity Index Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member]
Total pension plan assets	7,898	6,321
Global Equity GBP Hedge Fund [Member] | Equity Securities [Member]
Total pension plan assets	8,134	6,406
Global Equity GBP Hedge Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Total pension plan assets
Global Equity GBP Hedge Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Total pension plan assets
Global Equity GBP Hedge Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Total pension plan assets
Global Equity GBP Hedge Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member]
Total pension plan assets	8,134	6,406
Philippine Stock [Member] | Equity Securities [Member]
Total pension plan assets	1,031	906
Philippine Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Total pension plan assets	1,031	906
Philippine Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Total pension plan assets
Philippine Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Total pension plan assets
Philippine Stock [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member]
Total pension plan assets
Investment Grade Corporate Bond Funds [Member] | Debt Securities [Member]
Total pension plan assets	6,003	5,372
Investment Grade Corporate Bond Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Total pension plan assets	6,003	5,372
Investment Grade Corporate Bond Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Total pension plan assets
Investment Grade Corporate Bond Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Total pension plan assets
Investment Grade Corporate Bond Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member]
Total pension plan assets
Over 15y Gilts Index Fund [Member] | Debt Securities [Member]
Total pension plan assets	3,684	3,265
Over 15y Gilts Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Total pension plan assets
Over 15y Gilts Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Total pension plan assets
Over 15y Gilts Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Total pension plan assets
Over 15y Gilts Index Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member]
Total pension plan assets	3,684	3,265
Active Corp Bond Over 10 Yr Fund [Member] | Debt Securities [Member]
Total pension plan assets	6,835	5,902
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Total pension plan assets
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Total pension plan assets
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Total pension plan assets
Active Corp Bond Over 10 Yr Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member]
Total pension plan assets	6,835	5,902
Over 5y Index Linked Gilts Fund [Member] | Debt Securities [Member]
Total pension plan assets	12,049	10,724
Over 5y Index Linked Gilts Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Total pension plan assets
Over 5y Index Linked Gilts Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Total pension plan assets
Over 5y Index Linked Gilts Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Total pension plan assets
Over 5y Index Linked Gilts Fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member]
Total pension plan assets	12,049	10,724
Philippine Long Govt Securities [Member] | Debt Securities [Member]
Total pension plan assets	1,362	1,133
Philippine Long Govt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Total pension plan assets	1,362	1,133
Philippine Long Govt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Total pension plan assets
Philippine Long Govt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Total pension plan assets
Philippine Long Govt Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member]
Total pension plan assets
Philippine Long Corporate Bonds [Member] | Debt Securities [Member]
Total pension plan assets	723	751
Philippine Long Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Total pension plan assets	723	751
Philippine Long Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Total pension plan assets
Philippine Long Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Total pension plan assets
Philippine Long Corporate Bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Debt Securities [Member]
Total pension plan assets

Note 9 - Shareholders' Equity66

Note 9 - Shareholders' Equity (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016	May 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 2.2	$ 13.3	$ 5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	15	10.7	8.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid	0.9	0.6	0.4
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 15.9
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 328 days
Allocated Share-based Compensation Expense	$ 17.3	12.8	10.7
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	6	4.4	3.7
Accumulated Other Comprehensive Income (Loss), Pension and Other Post-retirement Benefit Plans, Liability Adjustment Tax	$ 1.4	$ 1.1	$ 0.7
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				1,000,000
Treasury Stock, Shares, Acquired	0
Minimum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	7 years
Minimum [Member] | Restricted Stock and Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Maximum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Maximum [Member] | Restricted Stock and Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years

Note 9 - Shareholders' Equity -

Note 9 - Shareholders' Equity - Reconciliation of Outstanding Stock Options (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 30, 2017USD ($)$ / sharesshares
Outstanding (in shares)	356,184
Outstanding (in dollars per share) | $ / shares	$ 98.65
Granted (in shares)	76,082
Granted (in dollars per share) | $ / shares	$ 154.15
Exercised (in shares)	(27,965)
Exercised (in dollars per share) | $ / shares	$ 84.93
Forfeited (in shares)
Outstanding (in shares)	404,301
Outstanding (in dollars per share) | $ / shares	$ 110.04
Outstanding (Year)	4 years 182 days
Outstanding | $	$ 35,488
Exercisable (in shares)	203,745
Exercisable (in dollars per share) | $ / shares	$ 92.36
Exercisable (Year)	3 years 219 days
Exercisable | $	$ 21,486

Note 9 - Shareholders' Equity68

Note 9 - Shareholders' Equity - Reconciliation of Nonvested Restricted Share and Share Unit Awards (Details) - Restricted Stock and Restricted Share Units [Member]	12 Months Ended
	Dec. 30, 2017$ / sharesshares
Nonvested (in shares) | shares	207,330
Nonvested (in dollars per share) | $ / shares	$ 106.92
Granted (in shares) | shares	95,621
Granted (in dollars per share) | $ / shares	$ 151.91
Vested (in shares) | shares	(95,520)
Vested (in dollars per share) | $ / shares	$ 102.49
Forfeited (in shares) | shares	(7,738)
Forfeited (in dollars per share) | $ / shares	$ 111.56
Nonvested (in shares) | shares	199,693
Nonvested (in dollars per share) | $ / shares	$ 130.40

Note 9 - Shareholders' Equity69

Note 9 - Shareholders' Equity - Weighted Average Fair Value of Options Granted and Black-Scholes Option Valuation Model Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Weighted average fair value of options granted (in dollars per share)	$ 30.77	$ 26.06	$ 21.99
Risk-free interest rate	1.79%	1.37%	1.25%
Expected dividend yield	0.86%	0.97%	1.04%
Expected stock price volatility	23.00%	26.00%	28.00%
Expected life of options (years) (Year)	4 years 146 days	4 years 219 days	4 years 219 days

Note 9 - Shareholders' Equity70

Note 9 - Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Balance		$ 814,931	$ 739,252	$ 724,319
Balance		927,556	814,931	739,252
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	[1]	(11,983)	(8,722)	(29,615)
Activity	[1]	1,147	(3,261)	20,893
Balance	[1]	(10,836)	(11,983)	(8,722)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Balance		10,769	11,584	10,791
Activity		(974)	(815)	793
Balance		9,795	10,769	11,584
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Balance		(73,365)	(48,533)	(2,302)
Activity		10,738	(24,832)	(46,231)
Balance		(62,627)	(73,365)	(48,533)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Balance		(74,579)	(45,671)	(21,126)
Activity		10,911	(28,908)	(24,545)
Balance		$ (63,668)	$ (74,579)	$ (45,671)
[1]	Net of tax of $1.4 million, $1.1 million, and $0.7 million at December 30, 2017; December 31, 2016; and January 2, 2016, respectively.

Note 10 - Income Taxes (Details

Note 10 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016	Dec. 30, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 47,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Toll Charge	49,000		$ 49,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Other Than Toll Charge	(2,000)		(1,962)
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount			13,000
Income Tax Expense (Benefit)			84,518	18,786	26,082
Income Taxes Paid			31,800	35,600	23,300
Proceeds from Income Tax Refunds			13,700
Undistributed Earnings of Foreign Subsidiaries	680,000		680,000
Deferred Tax Liabilities, Undistributed Foreign Earnings	12,000		12,000	1,750		$ 1,800
Income Tax Examination, Interest Expense			900	900	200
Income Tax Examination, Interest Accrued	3,300		3,300	2,400	1,500
Unrecognized Tax Benefits	7,660		7,660	8,617	3,532
CHINA
Income Tax Holiday, Aggregate Dollar Amount			$ 5,700
Income Tax Holiday Expense (Benefit) Amount Per Diluted Share			$ 0.25
Foreign Tax Authority [Member]
Deferred Tax Liabilities, Undistributed Foreign Earnings	11,800		$ 11,800
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member] | Earliest Tax Year [Member]
Income Tax Examination, Year under Examination			2,011
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member] | Latest Tax Year [Member]
Income Tax Examination, Year under Examination			2,014
Domestic Tax Authority [Member]
Deferred Tax Liabilities, Undistributed Foreign Earnings	200		$ 200
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Income Tax Examination, Year under Examination			2,015
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Income Tax Examination, Year under Examination			2,016
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Income Tax Expense (Benefit)					$ (11,700)
Carry-back of U.S. Federal Net Operating Loss [Member]
Income Tax Expense (Benefit)				$ (3,000)
Other Long-term Liabilities [Member]
Accrued Income Taxes, Noncurrent	$ 32,000		$ 32,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%

Note 10 - Income Taxes - Federa

Note 10 - Income Taxes - Federal, State, and Foreign Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Domestic	$ (20,496)	$ (9,563)	$ 1,313
Foreign	224,533	132,837	105,635
Income before income taxes	204,037	123,274	106,948
Current:
Federal	34,060	(3,992)	(6,686)
State	450	(648)	2,078
Foreign	32,945	28,695	19,211
Subtotal	67,455	24,055	14,603
Deferred:
Federal and State	16,562	(1,594)	11,330
Foreign	501	(3,675)	149
Subtotal	17,063	(5,269)	11,479
Provision for income taxes	$ 84,518	$ 18,786	$ 26,082

Note 10 - Income Taxes - Effect

Note 10 - Income Taxes - Effective Income Tax Reconciliation and Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 30, 2017	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Tax expense at statutory rate of 35%		$ 71,413	$ 43,146	$ 37,432
Provisional amount of the Toll charge	$ 49,000	49,000
Provisional Tax Act impact other than the Toll charge	$ 2,000	1,962
State and local taxes, net of federal tax benefit		292	(415)	1,907
Non-U.S. income tax rate differential		(47,077)	(25,471)	(18,253)
Impairment of goodwill without tax benefit			3,088
Tax on unremitted earnings		12,202	2,747
Mexico manufacturing operations restructuring				4,841
Nondeductible professional fees		1,240	313	1,011
Tax deduction for stock of foreign subsidiary			(3,896)
Other, net		(590)	(726)	(856)
Provision for income taxes		$ 84,518	$ 18,786	$ 26,082

Note 10 - Income Taxes - Effe74

Note 10 - Income Taxes - Effective Income Tax Reconciliation and Provision for Income Taxes (Details) (Parentheticals)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Statutory tax rate of 35%	35.00%	35.00%	35.00%

Note 10 - Income Taxes - Deferr

Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2016
Deferred tax assets:
Accrued expenses	$ 24,094	$ 31,770
Foreign tax credit carryforwards	1,053	6,472
Accrued restructuring	156	456
Capital losses	3,165	4,557
Domestic and foreign net operating loss carryforwards	5,778	2,223
Gross deferred tax assets	34,246	45,478
Less: Valuation allowance	(6,203)	(6,738)
Total deferred tax assets	28,043	38,740
Deferred tax liabilities:
Tax depreciation and amortization in excess of book	21,254	23,471
Tax on unremitted earnings	12,000	1,750	$ 1,800
Total deferred tax liabilities	33,254	25,221
Net deferred tax liabilities	$ (5,211)
Net deferred tax assets		$ 13,519

Note 10 - Income Taxes - Reconc

Note 10 - Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Unrecognized tax benefits	$ 8,617	$ 3,532
Additions for tax positions taken in the current year	370	2,696
Additions for tax positions taken in the pre-acquisition periods of acquired subsidiaries		2,491
Settlements		(102)
Other	(1,327)
Unrecognized tax benefits	$ 7,660	$ 8,617

Note 11 - Earnings Per Share (D

Note 11 - Earnings Per Share (Details Textual) - shares	Jan. 17, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		37,443	53,448	113,130
IXYS Corporation [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Acquisitions	2,100,000
IXYS Corporation [Member] | Subsequent Event [Member] | Conversion of IXYS Equity Awards Into Littlefuse Equity Awards [Member]
Conversion of Stock, Shares Issued	500,000

Note 11 - Earnings Per Share -

Note 11 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 30, 2017

[1]

Sep. 30, 2017

[2]

Jul. 01, 2017

[3]

Apr. 01, 2017

[4]

Dec. 31, 2016

[5]

Oct. 01, 2016

[6]

Jul. 02, 2016

[7]

Apr. 02, 2016

[8]

Dec. 30, 2017

Dec. 31, 2016

Jan. 02, 2016

Net income

$ (10,819)

$ 42,808

$ 48,638

$ 38,891

$ 27,245

$ 30,802

$ 27,152

$ 19,289

$ 119,519

$ 104,488

$ 80,866

Basic (in shares)

22,687

22,559

22,565

Effect of dilutive securities (in shares)

244

168

154

Diluted (in shares)

22,931

22,727

22,719

Earnings Per Share:

Basic earnings per share (in dollars per share)

$ 5.27

$ 4.63

$ 3.58

Diluted earnings per share (in dollars per share)

$ 5.21

$ 4.60

$ 3.56

[1]

In the fourth quarter of 2017, the Company recorded an estimated one-time tax charge of $49 million for the enactment of the Tax Cuts and Jobs Act for deemed repatriation of unremitted earnings of foreign subsidiaries, $1.4 million in acquisition and integration costs and $0.7 million in restructuring and production costs related to the transfer of Asian operations.

[2]

In the third quarter of 2017, the Company recorded $4.8 million in acquisition and integration costs and $1.5 million in restructuring and production costs related to the transfer of Asian operations.

[3]

In the second quarter of 2017, the Company recorded $0.3 million in acquisition and integration costs.

[4]

In the first quarter of 2017, the Company $1.5 million in acquisition and integration costs

[5]

In the fourth quarter of 2016, the Company recorded ($0.1) million gain related to the Company's transfer of its reed sensor manufacturing operations from the U.S. and China to the Philippines, $1.2 million of restructuring costs, $3.2 million in acquisition and integration costs and $0.3 million in non-cash inventory charges related to the 2016 acquisitions.

[6]

In the third quarter of 2016, the Company recorded $0.9 million of restructuring costs, $5.9 million in acquisition and integration costs, $14.8 million of charges related to the impairment of the Custom Products reporting unit and $0.5 million in non-cash inventory charges as noted above.

[7]

In the second quarter of 2016, the Company recorded $0.7 million related to the reed sensor manufacturing transfer as noted above, $0.1 million of restructuring costs, $6.1 million in acquisition and integration costs, $0.3 million in charges related to the closure of the manufacturing facility in Denmark and $6.9 million in non-cash inventory charges as noted above.

[8]

In the first quarter of 2016, the Company recorded $1.0 million related to the reed sensor manufacturing transfer as noted above, $0.4 million of restructuring costs, $6.2 million in acquisition and integration costs, and $1.6 million in charges related to the closure of the manufacturing facility in Denmark.

Note 12 - Segment Information79

Note 12 - Segment Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Number of Operating Segments									3
Business Combination, Acquisition Related Costs	$ 1,400	$ 4,800	$ 300	$ 1,500	$ 3,200	$ 5,900	$ 6,100	$ 6,200
Goodwill and Intangible Asset Impairment										$ 14,809
Legal Fees	$ 700	$ 1,500			1,200	$ 900	100	400
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | Outside the United States [Member]
Concentration Risk, Percentage									69.00%
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | CHINA
Concentration Risk, Percentage									26.00%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Arrow Electronics Inc. [Member]
Concentration Risk, Percentage									10.60%
Facility Relocation [Member]
Restructuring Charges					$ 100		700	1,000
Facility Closing [Member]
Restructuring Charges							$ 300	$ 1,600
Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs											4,600
Pension and Other Postretirement Benefits Cost (Reversal of Cost)											31,900
Legal Fees											3,600
Cost of Sales [Member] | Facility Relocation [Member]
Restructuring Charges											$ 5,200
Other Segments [Member] | Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs									$ 8,000	29,200
Restructuring Charges									$ 2,200	2,500
Other Segments [Member] | Cost of Sales [Member]
Goodwill and Intangible Asset Impairment										14,800
Other Segments [Member] | Cost of Sales [Member] | Facility Relocation [Member]
Restructuring Charges										1,600
Other Segments [Member] | Operating Income (Loss) [Member] | Facility Closing [Member]
Restructuring Charges										$ 1,900

Note 12 - Segment Information -

Note 12 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 30, 2017	[1]	Sep. 30, 2017	[2]	Jul. 01, 2017	[3]	Apr. 01, 2017	[4]	Dec. 31, 2016	[5]	Oct. 01, 2016	[6]	Jul. 02, 2016	[7]	Apr. 02, 2016	[8]	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Net sales		$ 304,849		$ 317,889		$ 313,355		$ 285,441		$ 284,518		$ 280,331		$ 271,912		$ 219,398		$ 1,221,534	$ 1,056,159	$ 867,864
Depreciation and amortization																		63,011	53,137	41,641
Operating income		$ 50,780		$ 58,609		$ 60,270		$ 48,852		$ 40,988		$ 27,526		$ 29,702		$ 32,428		218,511	130,644	104,157
Interest expense																		13,380	8,628	4,091
Foreign exchange loss (gain)																		2,376	472	(1,465)
Other (income) expense, net																		(1,282)	(1,730)	(5,417)
Income before income taxes																		204,037	123,274	106,948
Electronics [Member]
Net sales																		661,928	535,191	405,497
Depreciation and amortization																		35,215	29,141	22,936
Operating income																		155,880	117,088	78,194
Automotive [Member]
Net sales																		453,227	415,200	339,957
Depreciation and amortization																		22,459	18,107	13,437
Operating income																		62,571	59,905	53,086
Industrial [Member]
Net sales																		106,379	105,768	122,410
Depreciation and amortization																		5,337	5,889	5,268
Operating income																		10,334	3,615	18,094
Other Segments [Member]
Operating income	[9]																	$ (10,274)	$ (49,964)	$ (45,217)
[1]	In the fourth quarter of 2017, the Company recorded an estimated one-time tax charge of $49 million for the enactment of the Tax Cuts and Jobs Act for deemed repatriation of unremitted earnings of foreign subsidiaries, $1.4 million in acquisition and integration costs and $0.7 million in restructuring and production costs related to the transfer of Asian operations.
[2]	In the third quarter of 2017, the Company recorded $4.8 million in acquisition and integration costs and $1.5 million in restructuring and production costs related to the transfer of Asian operations.
[3]	In the second quarter of 2017, the Company recorded $0.3 million in acquisition and integration costs.
[4]	In the first quarter of 2017, the Company $1.5 million in acquisition and integration costs
[5]	In the fourth quarter of 2016, the Company recorded ($0.1) million gain related to the Company's transfer of its reed sensor manufacturing operations from the U.S. and China to the Philippines, $1.2 million of restructuring costs, $3.2 million in acquisition and integration costs and $0.3 million in non-cash inventory charges related to the 2016 acquisitions.
[6]	In the third quarter of 2016, the Company recorded $0.9 million of restructuring costs, $5.9 million in acquisition and integration costs, $14.8 million of charges related to the impairment of the Custom Products reporting unit and $0.5 million in non-cash inventory charges as noted above.
[7]	In the second quarter of 2016, the Company recorded $0.7 million related to the reed sensor manufacturing transfer as noted above, $0.1 million of restructuring costs, $6.1 million in acquisition and integration costs, $0.3 million in charges related to the closure of the manufacturing facility in Denmark and $6.9 million in non-cash inventory charges as noted above.
[8]	In the first quarter of 2016, the Company recorded $1.0 million related to the reed sensor manufacturing transfer as noted above, $0.4 million of restructuring costs, $6.2 million in acquisition and integration costs, and $1.6 million in charges related to the closure of the manufacturing facility in Denmark.
[9]	Included in "Other" Operating income (loss) for 2017 are costs related to the acquisition and integration costs associated with the Company's completed and pending acquisitions ($8.0 million in Cost of sales ("COS") and Selling, general, and administrative expenses ("SG&A") and charges related to restructuring and production transfers in the Company's Asia operations ($2.2 million in SG&A). Included in "Other" Operating income (loss) for 2016 are costs related to the impairment of the Custom Products reporting unit ($14.8 million), acquisition and integration costs associated with the Company's 2016 acquisitions ($29.2 million in COS and SG&A), transfer of the Company's reed switch manufacturing operations from its Lake Mills, Wisconsin and Suzhou, China locations to the Philippines ($1.6 million in COS), impairment and severance costs related to the closure of the Company's manufacturing facility in Denmark ($1.9 million in SG&A), and restructuring costs ($2.5 million in SG&A and Research and development expenses). Included in "Other" Operating income (loss) for 2015 are costs related to the transfer of the Company's reed switch manufacturing operations from its Lake Mills, Wisconsin and Suzhou, China locations to the Philippines ($5.2 million in COS), acquisition related fees ($4.6 million included in SG&A), pension settlement and other costs ($31.9 million in SG&A), and restructuring costs ($3.6 million in SG&A).

Note 12 - Segment Information81

Note 12 - Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 30, 2017		Sep. 30, 2017	[2]	Jul. 01, 2017	[3]	Apr. 01, 2017	[4]	Dec. 31, 2016		Oct. 01, 2016	[6]	Jul. 02, 2016	[7]	Apr. 02, 2016	[8]	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Net sales	$ 304,849	[1]	$ 317,889		$ 313,355		$ 285,441		$ 284,518	[5]	$ 280,331		$ 271,912		$ 219,398		$ 1,221,534	$ 1,056,159	$ 867,864
Long-lived assets	250,577								217,175								250,577	217,175	162,568
Additions to long-lived assets																	65,925	46,228	44,019
UNITED STATES
Net sales																	383,025	356,674	344,305
Long-lived assets	23,490								23,731								23,490	23,731	23,965
Additions to long-lived assets																	3,518	4,694	8,609
CHINA
Net sales																	321,111	263,701	193,792
Long-lived assets	86,310								65,345								86,310	65,345	37,241
Additions to long-lived assets																	32,775	13,181	9,710
Other Countries [Member]
Net sales																	517,398	435,784	329,767
Long-lived assets	47,138								42,492								47,138	42,492	20,707
Additions to long-lived assets																	7,258	7,590	3,887
MEXICO
Long-lived assets	62,510								52,262								62,510	52,262	47,130
Additions to long-lived assets																	19,395	15,667	9,193
PHILIPPINES
Long-lived assets	$ 31,129								$ 33,345								31,129	33,345	33,525
Additions to long-lived assets																	$ 2,979	$ 5,096	$ 12,620
[1]	In the fourth quarter of 2017, the Company recorded an estimated one-time tax charge of $49 million for the enactment of the Tax Cuts and Jobs Act for deemed repatriation of unremitted earnings of foreign subsidiaries, $1.4 million in acquisition and integration costs and $0.7 million in restructuring and production costs related to the transfer of Asian operations.
[2]	In the third quarter of 2017, the Company recorded $4.8 million in acquisition and integration costs and $1.5 million in restructuring and production costs related to the transfer of Asian operations.
[3]	In the second quarter of 2017, the Company recorded $0.3 million in acquisition and integration costs.
[4]	In the first quarter of 2017, the Company $1.5 million in acquisition and integration costs
[5]	In the fourth quarter of 2016, the Company recorded ($0.1) million gain related to the Company's transfer of its reed sensor manufacturing operations from the U.S. and China to the Philippines, $1.2 million of restructuring costs, $3.2 million in acquisition and integration costs and $0.3 million in non-cash inventory charges related to the 2016 acquisitions.
[6]	In the third quarter of 2016, the Company recorded $0.9 million of restructuring costs, $5.9 million in acquisition and integration costs, $14.8 million of charges related to the impairment of the Custom Products reporting unit and $0.5 million in non-cash inventory charges as noted above.
[7]	In the second quarter of 2016, the Company recorded $0.7 million related to the reed sensor manufacturing transfer as noted above, $0.1 million of restructuring costs, $6.1 million in acquisition and integration costs, $0.3 million in charges related to the closure of the manufacturing facility in Denmark and $6.9 million in non-cash inventory charges as noted above.
[8]	In the first quarter of 2016, the Company recorded $1.0 million related to the reed sensor manufacturing transfer as noted above, $0.4 million of restructuring costs, $6.2 million in acquisition and integration costs, and $1.6 million in charges related to the closure of the manufacturing facility in Denmark.

Note 13 - Selected Quarterly 82

Note 13 - Selected Quarterly Financial Data (Unaudited) (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Toll Charge	$ 49,000								$ 49,000
Business Combination, Acquisition Related Costs	1,400	$ 4,800	$ 300	$ 1,500	$ 3,200	$ 5,900	$ 6,100	$ 6,200
Legal Fees	$ 700	$ 1,500			1,200	900	100	400
Other Nonrecurring (Income) Expense					300	500	6,900
Asset Impairment Charges						$ 14,800
Facility Relocation [Member]
Restructuring Charges					$ 100		700	1,000
Facility Closing [Member]
Restructuring Charges							$ 300	$ 1,600

Note 13 - Selected Quarterly 83

Note 13 - Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 30, 2017	[1]	Sep. 30, 2017	[2]	Jul. 01, 2017	[3]	Apr. 01, 2017	[4]	Dec. 31, 2016	[5]	Oct. 01, 2016	[6]	Jul. 02, 2016	[7]	Apr. 02, 2016	[8]	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Net sales	$ 304,849		$ 317,889		$ 313,355		$ 285,441		$ 284,518		$ 280,331		$ 271,912		$ 219,398		$ 1,221,534	$ 1,056,159	$ 867,864
Gross profit	126,624		133,651		132,608		113,650		114,337		113,759		97,866		87,155		506,533	413,117	330,499
Operating income	50,780		58,609		60,270		48,852		40,988		27,526		29,702		32,428		218,511	130,644	104,157
Net income	$ (10,819)		$ 42,808		$ 48,638		$ 38,891		$ 27,245		$ 30,802		$ 27,152		$ 19,289		$ 119,519	$ 104,488	$ 80,866
Basic (in dollars per share)	$ (0.48)		$ 1.88		$ 2.13		$ 1.71		$ 1.20		$ 1.36		$ 1.21		$ 0.86
Diluted (in dollars per share)	$ (0.48)		$ 1.87		$ 2.11		$ 1.69		$ 1.19		$ 1.35		$ 1.20		$ 0.85
[1]	In the fourth quarter of 2017, the Company recorded an estimated one-time tax charge of $49 million for the enactment of the Tax Cuts and Jobs Act for deemed repatriation of unremitted earnings of foreign subsidiaries, $1.4 million in acquisition and integration costs and $0.7 million in restructuring and production costs related to the transfer of Asian operations.
[2]	In the third quarter of 2017, the Company recorded $4.8 million in acquisition and integration costs and $1.5 million in restructuring and production costs related to the transfer of Asian operations.
[3]	In the second quarter of 2017, the Company recorded $0.3 million in acquisition and integration costs.
[4]	In the first quarter of 2017, the Company $1.5 million in acquisition and integration costs
[5]	In the fourth quarter of 2016, the Company recorded ($0.1) million gain related to the Company's transfer of its reed sensor manufacturing operations from the U.S. and China to the Philippines, $1.2 million of restructuring costs, $3.2 million in acquisition and integration costs and $0.3 million in non-cash inventory charges related to the 2016 acquisitions.
[6]	In the third quarter of 2016, the Company recorded $0.9 million of restructuring costs, $5.9 million in acquisition and integration costs, $14.8 million of charges related to the impairment of the Custom Products reporting unit and $0.5 million in non-cash inventory charges as noted above.
[7]	In the second quarter of 2016, the Company recorded $0.7 million related to the reed sensor manufacturing transfer as noted above, $0.1 million of restructuring costs, $6.1 million in acquisition and integration costs, $0.3 million in charges related to the closure of the manufacturing facility in Denmark and $6.9 million in non-cash inventory charges as noted above.
[8]	In the first quarter of 2016, the Company recorded $1.0 million related to the reed sensor manufacturing transfer as noted above, $0.4 million of restructuring costs, $6.2 million in acquisition and integration costs, and $1.6 million in charges related to the closure of the manufacturing facility in Denmark.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts and Reserve (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Allowance for Doubtful Accounts [Member]
Balance at beginning of year		$ 2,079	$ 319	$ 278
Charged to costs and expenses	[1]	3,068	1,769	164
Deductions	[2]	(4,070)	(42)	150
Charged to other accounts	[3]	95	33	27
Balance at end of year		1,172	2,079	319
Reserve for Cash Discount [Member]
Balance at beginning of year		23,825	17,168	19,140
Charged to costs and expenses	[1]	106,781	91,632	81,335
Deductions	[2]	(104,941)	(90,837)	82,997
Charged to other accounts	[3]	679	5,862	(310)
Balance at end of year		26,344	23,825	17,168
Valuation Allowance of Deferred Tax Assets [Member]
Balance at beginning of year		6,738	4,557	4,557
Charged to costs and expenses	[1]
Deductions	[2]
Charged to other accounts	[3]	(535)	2,181
Balance at end of year		$ 6,203	$ 6,738	$ 4,557
[1]	Includes provision for doubtful accounts, sales returns and sales discounts granted to customers.
[2]	Represents uncollectible accounts written off, net of recoveries and credits issued to customers and the write-off of certain deferred tax assets that previously had full valuation allowances.
[3]	Represents business acquisitions, U.S. and non-U.S. subsidiary tax attributes and foreign currency translation adjustments.