Ichor (ICHR) 10-K 8 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 28, 2018	Mar. 01, 2019	Jun. 29, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 28, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	ICHR
Entity Registrant Name	ICHOR HOLDINGS, LTD.
Entity Central Index Key	1,652,535
Current Fiscal Year End Date	--12-28
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Ordinary Shares Outstanding		22,369,135
Entity Public Float			$ 534,635,184

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Current assets:
Cash	$ 43,834	$ 68,794
Restricted cash		510
Accounts receivable, net	40,287	49,249
Inventories, net	121,106	154,541
Prepaid expenses and other current assets	6,348	5,357
Current assets from discontinued operations		3
Total current assets	211,575	278,454
Property and equipment, net	41,740	34,380
Other noncurrent assets	906	1,052
Deferred tax assets, net	1,363	994
Intangible assets, net	56,895	73,405
Goodwill	173,010	169,399
Total assets	485,489	557,684
Current liabilities:
Accounts payable	64,300	121,405
Accrued liabilities	9,556	12,211
Other current liabilities	5,148	6,715
Current portion of long-term debt	8,750	6,490
Current liabilities from discontinued operations		400
Total current liabilities	87,754	147,221
Long-term debt, less current portion, net	192,117	180,247
Deferred tax liabilities	3,966	10,558
Other non-current liabilities	3,326	2,896
Total liabilities	287,163	340,922
Shareholders’ equity:
Preferred shares ($0.0001 par value; 20,000,000 shares authorized; zero shares issued and outstanding)
Ordinary shares ($0.0001 par value; 200,000,000 shares authorized; 22,234,508 and 25,892,162 shares outstanding, respectively; 26,574,037 and 25,892,162 shares issued, respectively)	2	3
Additional paid in capital	228,358	214,697
Treasury shares at cost (4,339,529 and zero shares, respectively)	(89,979)
Retained earnings	59,945	2,062
Total shareholders’ equity	198,326	216,762
Total liabilities and shareholders’ equity	$ 485,489	$ 557,684

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 28, 2018	Dec. 29, 2017
Statement Of Financial Position [Abstract]
Preferred shares, par value	$ 0.0001	$ 0.0001
Preferred shares, authorized	20,000,000	20,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Ordinary shares, par value	$ 0.0001	$ 0.0001
Ordinary shares, authorized	200,000,000	200,000,000
Ordinary shares, issued	26,574,037	25,892,162
Ordinary shares, outstanding	22,234,508	25,892,162
Treasury shares	4,339,529	0

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Net sales	$ 823,611	$ 655,892	$ 405,747
Cost of sales	687,474	555,131	340,352
Gross profit	136,137	100,761	65,395
Operating expenses:
Research and development	9,355	7,899	6,383
Selling, general, and administrative	47,448	37,802	28,126
Amortization of intangible assets	15,369	8,880	7,015
Total operating expenses	72,172	54,581	41,524
Operating income	63,965	46,180	23,871
Interest expense	9,987	3,277	4,370
Other income, net	(241)	(126)	(629)
Income from continuing operations before income taxes	54,219	43,029	20,130
Income tax benefit from continuing operations	(3,664)	(13,886)	(649)
Net income from continuing operations	57,883	56,915	20,779
Discontinued operations:
Loss from discontinued operations before taxes		(722)	(4,077)
Income tax expense (benefit) from discontinued operations		(261)	40
Net loss from discontinued operations		(461)	(4,117)
Net income	57,883	56,454	16,662
Less: Undistributed earnings attributable to preferred shareholders			(15,284)
Net income attributable to ordinary shareholders	$ 57,883	$ 56,454	$ 1,378
Net income per share from continuing operations attributable to ordinary shareholders, Basic	$ 2.34	$ 2.27	$ 1.14
Net income per share from continuing operations attributable to ordinary shareholders, Diluted	2.30	2.17	0.87
Net income per share attributable to ordinary shareholders, Basic	2.34	2.25	0.92
Net income per share attributable to ordinary shareholders, Diluted	$ 2.30	$ 2.15	$ 0.70
Shares used to compute net income from continuing operations per share attributable to ordinary shareholders:
Shares used to compute net income per share attributable to ordinary shareholders, Basic	24,706,542	25,118,031	1,503,296
Shares used to compute net income per share attributable to ordinary shareholders, Diluted	25,128,055	26,218,424	1,967,926
Continuing Operations
Shares used to compute net income from continuing operations per share attributable to ordinary shareholders:
Shares used to compute net income per share attributable to ordinary shareholders, Basic	24,706,542	25,118,031	1,503,296
Shares used to compute net income per share attributable to ordinary shareholders, Diluted	25,128,055	26,218,424	1,967,926

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Shares	Ordinary Shares	Additional Paid-in Capital	Treasury Shares	Retained Earnings (Accumulated Deficit)
Balance at Dec. 25, 2015	$ 74,678	$ 142,728		$ 3,004		$ (71,054)
Balance, Shares at Dec. 25, 2015		17,722,808	65,409
Ordinary shares issued from initial public offering, net of transaction costs	47,103			47,103
Ordinary shares issued from initial public offering, net of transaction costs, shares			5,877,778
Conversion of preferred shares to ordinary shares	0	$ (142,728)	$ 2	142,726
Conversion of preferred shares to ordinary shares, shares		(17,722,808)	17,722,808
Ordinary shares issued from vesting of restricted share units, Shares			191,386
Share-based compensation expense	3,216			3,216
Net income	16,662					16,662
Balance at Dec. 30, 2016	141,659		$ 2	196,049		(54,392)
Balance, Shares at Dec. 30, 2016			23,857,381
Ordinary shares issued from initial public offering, net of transaction costs	7,278		$ 1	7,277
Ordinary shares issued from initial public offering, net of transaction costs, shares			881,667
Ordinary shares issued from exercise of stock options	9,141			9,141
Ordinary shares issued from exercise of stock options, shares			1,078,182
Ordinary shares issued from vesting of restricted share units, Shares			74,932
Share-based compensation expense	2,230			2,230
Net income	56,454					56,454
Balance at Dec. 29, 2017	216,762		$ 3	214,697		2,062
Balance, Shares at Dec. 29, 2017			25,892,162
Ordinary shares issued from exercise of stock options	5,661			5,661
Ordinary shares issued from exercise of stock options, shares			573,162
Ordinary shares issued from vesting of restricted share units	(91)			(91)
Ordinary shares issued from vesting of restricted share units, Shares			79,336
Ordinary shares issued from employee share purchase plan	514			514
Ordinary shares issued from employee share purchase plan, shares			29,377
Repurchase of ordinary shares	$ (89,980)		$ (1)		$ (89,979)
Repurchase of ordinary shares, shares	(4,339,529)		(4,339,529)		4,339,529
Share-based compensation expense	$ 7,577			7,577
Net income	57,883					57,883
Balance at Dec. 28, 2018	$ 198,326		$ 2	$ 228,358	$ (89,979)	$ 59,945
Balance, Shares at Dec. 28, 2018			22,234,508		4,339,529

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Cash flows from operating activities:
Net income	$ 57,883	$ 56,454	$ 16,662
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,064	12,509	9,497
Gain on sale of investments and settlement of note receivable		(241)
Share-based compensation	7,577	2,230	3,216
Deferred income taxes	(6,687)	(15,347)	(2,429)
Amortization of debt issuance costs	970	608	527
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	10,425	(1,059)	(9,007)
Inventories	35,126	(43,425)	(23,719)
Prepaid expenses and other assets	(685)	3,386	(3,381)
Accounts payable	(62,173)	22,612	36,761
Accrued liabilities	(3,518)	848	1,612
Other liabilities	(1,507)	228	(2,009)
Net cash provided by operating activities	60,475	38,803	27,730
Cash flows from investing activities:
Capital expenditures	(13,920)	(8,226)	(4,268)
Cash paid for acquisitions, net of cash acquired	(1,443)	(180,955)	(17,407)
Proceeds from sale of intangible assets			230
Proceeds from sale of property, plant, and equipment			243
Proceeds from sale of investments and settlement note receivable		2,430
Net cash used in investing activities	(15,363)	(186,751)	(21,202)
Cash flows from financing activities:
Issuance of ordinary shares, net of fees		7,278	47,103
Issuance of ordinary shares under share-based compensation plans	6,329	9,141
Employees' taxes paid upon vesting of restricted share units	(91)
Repurchase of ordinary shares	(89,980)
Debt issuance and modification costs	(2,092)	(1,520)
Borrowings on revolving credit facility	44,162	10,000	12,000
Repayments on revolving credit facility	(20,000)		(22,000)
Proceeds from term loan		140,000	15,000
Repayments on term loan	(8,910)	(295)	(30,171)
Net cash provided by (used in) financing activities	(70,582)	164,604	21,932
Net increase (decrease) in cash	(25,470)	16,656	28,460
Cash at beginning of year	69,304	52,648	24,188
Cash at end of year	43,834	69,304	52,648
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	8,273	3,436	3,686
Cash paid during the period for taxes	2,278	1,068	103
Supplemental disclosures of non-cash activities:
Capital expenditures included in accounts payable	$ 1,462	$ 723	$ 1,174

Organization and Summary of Sig

Organization and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 28, 2018
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Operations of the Company Ichor Holdings, Ltd. and Subsidiaries (the “we”, “us”, “our”, “Company”) designs, develops, manufactures and distributes gas and liquid delivery subsystems and components purchased by capital equipment manufacturers for use in the semiconductor markets. We are headquartered in Fremont, California and have operations in the United States, United Kingdom, Singapore, Malaysia, and Korea. On December 30, 2011, Ichor Systems Holdings, LLC consummated a sales transaction with Icicle Acquisition Holdings, LLC, a Delaware limited liability company. Shortly after consummation of the sale transaction, Icicle Acquisition Holdings, LLC changed its name to Ichor Holdings, LLC. In March 2012, Ichor Holdings, LLC completed a reorganization of its legal structure, forming Ichor Holdings, Ltd., a Cayman Islands entity. Ichor Holdings, Ltd. is now the reporting entity and the ultimate parent company of the operating entities. In January 2016, we decided to close our Kingston, New York facility which was the primary facility for the Precision Flow Technologies, Inc. (“PFT”) subsidiary. In May 2016, we ceased operations in this facility and ended the relationship with the customer it served in this location. Our consolidated financial statements and accompanying notes for current and prior periods have been retroactively adjusted to present the results of operations of the Precision Flow Technologies, Inc. subsidiary as a discontinued operation. In addition, the assets and liabilities to be disposed of have been treated and classified as a discontinued operation. For more information on the discontinued operation see Note 15 – Discontinued Operations Basis of Presentation These consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). All intercompany balances and transactions have been eliminated upon consolidation. All financial figures presented in the notes to consolidated financial statements are in thousands, except share, per share, and percentage figures. These consolidated financial statements include the following wholly owned subsidiaries of Ichor Holdings, Ltd.: Name of Subsidiary Jurisdiction of Incorporation, Organization, or Formation Ichor Intermediate Holdings, Ltd. Cayman Islands Icicle Acquisition Holding Co-op Netherlands Icicle Acquisition Holding B.V. Netherlands Ichor Holdings Ltd. Scotland Ichor Systems Ltd. Scotland Ichor Holdings, LLC Delaware Ichor Systems, Inc. Delaware Ichor Systems Korea Ltd. Korea Ichor Systems Malaysia Sdn Bhd Malaysia Ichor Systems Singapore, PTE Ltd. Singapore Precision Flow Technologies, Inc. New York Ajax-United Patterns & Molds, Inc. California Cal-Weld, Inc. California Talon Innovations Corporations Minnesota Talon Innovations (FL) Corporation Florida Talon Innovations Korea Korea IAN Engineering Co., Ltd. Korea Public Offering On December 14, 2016, we completed an initial public offering (“IPO”) of 5,877,778 ordinary shares at a price to the public of $9.00 per share. We received net proceeds from the offering of $47.1 million after offering fees and expenses. The net proceeds were used to repay $40.0 million of loans outstanding under our Credit Facilities. In January 2017, we received $7.3 million, net of fees and expenses, from the exercise of the underwriters’ over‑allotment option to sell an additional 881,667 ordinary shares. Year End We use a 52 or 53 week fiscal year ending on the last Friday in December. The years ended December 28, 2018 and December 29, 2017 were both 52 weeks. The year ended December 30, 2016 was 53 weeks. All references to 2018, 2017, and 2016 are references to the fiscal years then ended. Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods presented. We base our estimates and judgments on historical experience and on various other assumptions that we believe are reasonable under the circumstances. Actual results could differ from the estimates made by management. Significant estimates include the fair value of assets and liabilities acquired in acquisitions, estimated useful lives for long-lived assets, allowance for doubtful accounts, inventory valuation, uncertain tax positions, fair value assigned to stock options granted, and impairment analysis for both definite-lived intangible assets and goodwill. Revenue Recognition We recognize revenue when control of promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. This amount is recorded as net sales in our consolidated statements of operations. Transaction price – In most of our contracts, prices are generally determined by a customer-issued purchase order and generally remain fixed over the duration of the contract. Certain contracts contain variable consideration, including early-payment discounts and rebates. When a contract includes variable consideration, we evaluate the estimate of the variable consideration to determine whether the estimate needs to be constrained; therefore, we include the variable consideration in the transaction price only to the extent that it is probable that a significant reversal will not occur. Variable consideration estimates are updated at each reporting date. Historically, we have not incurred significant costs to obtain a contract. All amounts billed to a customer relating to shipping and handling are classified as net sales, while all costs incurred by us for shipping and handling are classified as cost of goods sold. Performance obligations – Substantially all of our performance obligations pertain to promised goods (“products”), which are primarily comprised of fluid delivery subsystems, weldments, and other components. Most of our contracts contain a single performance obligation and are generally completed within twelve months. Product sales are recognized at a point-in-time, generally upon delivery, as such term is defined within the contract, as that is when control of the promised good has transferred. Products are covered by a standard assurance warranty, generally extended for a period of one to two years depending on the customer, which promises that delivered products conform to contract specifications. As such, we account for such warranties under ASC 460, Guarantees , and not as a separate performance obligation . Contract balances – Accounts receivable represents our unconditional right to receive consideration from our customers. Accounts receivable are carried at invoice price less an estimate for doubtful accounts and estimated payment discounts. Payment terms vary by customer but are generally due within 15‑60 days. Historically, we have not incurred significant payment issues with our customers. We had no significant contract assets or liabilities on our consolidated balance sheets in any of the periods presented Concentration of Credit Risk Financial instruments that subject us to credit risk consist of accounts receivable, accounts payable and long-term debt. At December 28, 2018 and December 29, 2017, two customers represented, in the aggregate, approximately 40% and 61%, respectively, of the balance of accounts receivable. We establish an allowance for doubtful accounts based upon the credit risk of specific customers, historical trends, and other information. Activity and balances related to the allowance for doubtful accounts is as follows: Allowance for doubtful accounts Balance at December 25, 2015 $ 123 Charges to costs and expenses 71 Write-offs — Balance at December 30, 2016 194 Charges to costs and expenses 62 Write-offs — Balance at December 29, 2017 256 Charges to costs and expenses 195 Write-offs and recoveries (111 ) Balance at December 28, 2018 $ 340 We require collateral, typically cash, in the normal course of business if customers do not meet the criteria established for offering credit. If the financial condition of our customers were to deteriorate and result in an impaired ability to make payments, additions to the allowance may be required. Accounts receivable are written off when deemed uncollectible. Recoveries of accounts receivable previously written off are recorded to income when received. We use qualified manufacturers to supply many components and subassemblies of our products. We obtain the majority of our components from a limited group of suppliers. A majority of the purchased components used in our products are customer specified. An interruption in the supply of a particular component would have a temporary adverse impact on our operating results. We maintain cash balances at both United States-based and foreign-based commercial banks. Cash balances in the United States exceed amounts that are insured by the Federal Deposit Insurance Corporation (FDIC). The majority of the cash maintained in foreign-based commercial banks is insured by the government where the foreign banking institutions are based. Cash held in foreign-based commercial banks totaled $25.5 million and $36.4 million at December 28, 2018 and December 29, 2017, respectively, and at times exceeds insured amounts. No losses have been incurred at December 28, 2018 and December 29, 2017 for amounts exceeding the insured limits. Fair Value Measurements We estimate the fair value of financial assets and liabilities based upon comparison of such assets and liabilities to the current market values for instruments of a similar nature and degree of risk. We utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible. We determine fair value based on assumptions that market participants would use in pricing an asset or liability in the principal or most advantageous market. When considering market participant assumptions in fair value measurements, the following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the following levels: ▪ Level 1 Inputs: Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date ▪ Level 2 Inputs: Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability ▪ Level 3 Inputs: Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date There were no changes to our valuation techniques during 2018. We estimate that the recorded value of our financial assets and liabilities approximate fair value at December 28, 2018 and December 29, 2017. We estimate the value of intangible assets on a nonrecurring basis based on an income approach utilizing discounted cash flows. Under this approach, we estimate the future cash flows from our asset groups and discount the income stream to its present value to arrive at fair value. Future cash flows are based on recently prepared operating forecasts. Operating forecasts and cash flows include, among other things, revenue growth rates that are calculated based on management’s forecasted sales projections. A discount rate is utilized to convert the forecasted cash flows to their present value equivalent. The discount rate applied to the future cash flows includes a subject-company risk premium, an equity market risk premium, a beta, and a risk-free rate. As this approach contains unobservable inputs, the measurement of fair value for intangible assets is classified as Level 3. Inventories Inventories are stated at the lower of cost or net realizable value. The majority of inventory values are based upon average costs. We analyze inventory levels and record write-downs for inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value, and inventory in excess of expected customer demand. We assess the valuation of all inventories, including raw materials, work-in-process, finished goods and spare parts on a periodic basis. Obsolete inventory or inventory in excess of our estimated usage is written down to its estimated market value less costs to sell, if less than its cost. Inherent in our estimates of demand and market value in determining inventory valuation are estimates related to economic trends, future demand for our products and technological obsolescence of our products. If actual demand and market conditions are less favorable than our projections, additional inventory write-downs may be required. If the inventory value is written down to its net realizable value, and subsequently there is an increased demand for the inventory at a higher value, the increased value of the inventory is not realized until the inventory is sold either as a component of a subsystem or as separate inventory. Property and Equipment Property, plant and equipment are stated at cost, less accumulated depreciation. Depreciation is computed using the straight-line method over the following estimated useful lives: Estimated useful lives of PP&E Machinery 5-10 years Leasehold improvements Lesser of 10 years or lease term Computer software, hardware, and equipment 3-5 years Office furniture, fixtures, and equipment 5-7 years Vehicles 5 years Maintenance and repairs that neither add materially to the value of the asset nor appreciably prolong its useful life are charged to expense as incurred. Gains or losses on the disposal of property and equipment are included in selling, general and administrative expenses on the consolidated statements of operations. Long-Lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate, in management’s judgment, that the carrying amount of an asset (or asset group) may not be recoverable. In analyzing potential impairments, projections of future cash flows from the asset group are used to estimate fair value. If the sum of the expected future undiscounted cash flows is less than the carrying amount of the asset group, a loss is recognized for the difference between the estimated fair value and the carrying value of the asset group. The projections are based on assumptions, judgments and estimates of revenue growth rates for the related business, anticipated future economic, regulatory and political conditions, the assignment of discount rates relative to risk, and estimates of terminal values. At December 28, 2018 and December 29, 2017, intangible assets passed the recoverability test resulting in no impairment. Intangible Assets We account for intangible assets that have a definite life and are amortized on a basis consistent with their expected cash flows over the following estimated useful lives: Estimated useful lives of intangibles Trademarks 10 years Customer relationships 6-10 years Developed technology 7-10 years Goodwill Goodwill represents the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. We review goodwill for impairment annually and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. We first make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying a quantitative goodwill impairment test. Under the quantitative test, the fair value of the reporting unit is compared to its carrying value and an impairment loss is recognized for any excess of carrying amount over the reporting unit’s fair value. Fair value of the reporting unit is determined using a discounted cash flow analysis. For purposes of testing goodwill for impairment, we have concluded that we operate as one reporting unit. We performed a qualitative goodwill assessment at December 28 2018 and December 29, 2017. This assessment indicated that it was more likely than not our reporting unit’s fair value exceeded its carrying value. Research and Development Costs Research and development costs are expensed as incurred. Special Bonus On August 11, 2015, our Board of Directors instituted a special bonus to certain members of management totaling $3.1 million. In December 2016 our Board of Directors approved that all remaining special bonus not yet earned had been earned, resulting in a $0.6 million expense in 2016. There were no such bonuses instituted in 2018 or 2017. Share-Based Payments We use the Black-Scholes option-pricing model to value the awards on the date of grant. We use the simplified method to estimate the expected term of share-based awards for all periods as we do not have sufficient history to estimate the weighted average expected term. The risk-free interest rate is based on the U.S. Treasury rates in effect on the corresponding date of grant. Estimated volatility is based on the historical volatility of ours and similar entities’ publicly traded shares. Income Taxes We recognize deferred income taxes using the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred income taxes are recognized for differences between the financial reporting and tax bases of assets and liabilities at enacted statutory tax rates in effect for the years in which the differences are expected to reverse. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. Income tax benefit for the current year differs from the statutory rate primarily as a result of the impact of foreign operations and discrete tax benefits recorded in connection with our historical acquisitions, stock option exercises, and the release of the valuation allowance against certain foreign tax credits that are now expected to be utilized as a result of the analysis performed related to the Tax Cuts and Jobs Act passed in 2017. When tax returns are filed, it is highly certain that some positions taken would be sustained upon examination by the taxing authorities, while others may be subject to uncertainty about the merits of the position taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the consolidated financial statements in the period during which, based on all available evidence, management believes it is more likely than not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. Tax positions taken are not offset or aggregated with other positions. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefit that is more than 50% likely of being realized upon settlement with the applicable taxing authority. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above is reflected as a liability for unrecognized tax benefits in our consolidated balance sheets along with any associated interest and penalties that would be payable to the taxing authorities upon examination. We recognize interest and penalties as a component of income tax expense. Foreign Operations The functional currency of our international subsidiaries located in the United Kingdom, Singapore, and Malaysia, is the U.S. dollar. Transactions denominated in currencies other than the functional currency generate foreign exchange gains and losses that are included in other income, net on our consolidated statements of operations. Substantially, all of our sales and agreements with third-party suppliers provide for pricing and payments in U.S. dollars and, therefore, are not subject to material exchange rate fluctuations. Foreign operations consist of revenue of $379.1 million, $346.0 million, and $241.7 million during 2018, 2017, and 2016, respectively. Assets of foreign operations totaled $157.0 million and $127.2 million at December 29, 2017 and December 30, 2016, respectively. Accounting Pronouncements Recently Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Updated (“ASU”) 2014‑09, Revenue from Contracts with Customers (Topic 606) We adopted Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers , on December 30, 2017, the first day of fiscal year 2018, using the modified retrospective method. After assessing our contracts with our customers, we determined that there was not a significant change to the nature, timing, and extent of our revenues under the new standard. Accordingly, we did not make a cumulative-effect adjustment to retained earnings on December 30, 2017, as there was no adjustment to be made. In August 2016, the FASB issued ASU 2016‑15, Statement of Cash Flows – Classification of Certain Cash Receipts and Cash Payments . The amendment provides and clarifies guidance on the classification of certain cash receipts and cash payments in the statement of cash flows to eliminate diversity in practice. We adopted ASU 2016-15 on December 30, 2017, the first day of fiscal year 2018, which did not have a significant impact on our consolidated financial statements. In January 2017, the FASB issued ASU 2017‑01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The amendments in this update clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. We adopted ASU 2017‑01 on December 30, 2017, the first day of fiscal year 2018, which did not have a significant impact on our consolidated financial statements. In May 2017, the FASB issued ASU 2017‑09, Compensation-Stock Compensation (Topic 718) – Scope of Modification Accounting , which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. We adopted ASU 2017‑09 on December 30, 2017, the first day of fiscal year 2018, which did not have a significant impact on our consolidated financial statements. Accounting Pronouncements Recently Issued In February 2016, the FASB issued ASU 2016‑02, Leases (Topic 842) , which consists of a comprehensive lease accounting standard. Under the new standard, assets and liabilities arising from most leases will be recognized on the balance sheet. Leases will be classified as either operating or financing, and the lease classification will determine whether expense is recognized on a straight-line basis (operating leases) or based on an effective interest method (financing leases). The standard also contains expanded disclosure requirements regarding the amounts, timing, and uncertainties of cash flows related to leasing activities. The new standard is effective for interim and annual periods beginning after December 15, 2018. In July 2018, the FASB issued ASU 2018‑11, Leases (Topic 842): Targeted Improvements , which provides an optional transition method allowing entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We plan to use the optional transition method and apply the lease standard as of December 29, 2018, the first day of fiscal year 2019. The new standard provides a number of practical expedients in transition. We will elect the package of practical expedients, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification, and initial direct costs. We will elect to not recognize short-term leases, those with an initial term of 12 months or less, on our consolidated balance sheets. We expect the new standard to have a material effect on our consolidated financial statements. While we continue to assess all of the effects of adoption, we currently believe the most significant effects relate to the recognition of new right-of-use (“ROU”) assets and lease liabilities on our balance sheet for our facilities operating leases and the new disclosure requirements about our leasing activities. Upon adoption of the standard, we anticipate recording lease liabilities and ROU assets to our consolidated balance sheet of approximately $17‑22 million. We do not anticipate a significant cumulative-effect adjustment to the opening balance of retained earnings, and we don’t anticipate the standard to have a material impact on our consolidated statements of income or cash flows. We are evaluating the disclosure requirements and collecting the relevant data in preparation for disclosure in our first quarter 2019 consolidated financial statements, and we are continuing to review our existing contracts for potential embedded leases. In June 2018, the FASB issued ASU 2018‑07, Compensation-Stock Compensation (Topic 718): Improvements to Non-Employee Share-Based Payment Accounting . This standard is intended to reduce cost and complexity and to improve financial reporting for share-based payments issued to nonemployees. ASU 2018‑07 expands the scope of ASC Topic 718, which currently only includes share-based payments issued to employees, to also include share-based payments issued to nonemployees for goods and services. The provisions are effective for annual periods beginning after December 15, 2018. We do not expect this ASU to have a material impact on our consolidated financial statements.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 28, 2018
Business Combinations [Abstract]
Acquisitions	Note 2 – Acquisitions IAN Engineering Co., Ltd. On April 19, 2018, we completed the acquisition, via stock purchase, of IAN Engineering Co., Ltd. (“IAN”), a Seoul-based leader in providing locally-sourced design and manufacturing of gas delivery systems to customers in South Korea, for an aggregate purchase price of $6.5 million, inclusive of $5.3 million paid at closing and contingent consideration with a fair value of $1.3 million. Contingent consideration consisted of an earn-out liability that became payable in 2019 and 2020 if certain financial targets were achieved. During 2018, we determined those financial targets would not be met and, therefore, derecognized the earn-out liability, resulting in a gain of $1.3 million recognized in operating income on our consolidated statements of income. As this determination was made because of facts and circumstances that arose after the acquisition date, there was no change to total acquisition consideration. IAN provides us exposure to and growth opportunities in the South Korean semiconductor capital equipment market. The following table presents the preliminary purchase price allocation as of April 19, 2018 and December 28, 2018. Measurement period adjustments recognized in 2018 relate to the fair value of IAN’s opening balance of deferred taxes. Preliminary Allocation April 19, 2018 2018 Measurement Period Adjustment Preliminary Allocation December 28, 2018 Cash acquired $ 3,952 $ — $ 3,952 Accounts receivable 863 — 863 Inventories 1,870 — 1,870 Prepaid expenses and other current assets 56 — 56 Property and equipment 396 — 396 Other noncurrent assets 101 — 101 Intangible assets 1,559 — 1,559 Goodwill 2,856 6 2,862 Accounts payable (4,193 ) — (4,193 ) Accrued and other current liabilities (452 ) — (452 ) Deferred tax liabilities (383 ) (6 ) (389 ) Other non-current liabilities (82 ) — (82 ) Total acquisition consideration $ 6,543 $ — $ 6,543 We preliminarily allocated $1.6 million to customer relationships with an amortization period of 6 years. Goodwill recognized from the acquisition was primarily attributed to an assembled workforce and expected synergies and is not tax deductible. The allocation of acquisition consideration for IAN is preliminary as we have not obtained all of the information to finalize our procedures on the opening balance sheet or the allocation between goodwill and intangible assets. We have recorded allocations based on information currently available. Our consolidated statements of operations for 2018 include approximately eight months of IAN operating activity, including revenue of $7.7 million. Pro forma financial information has not been provided for the acquisition of IAN as it was not material to our operations and overall financial position. Talon Innovations Corporation On December 11, 2017 we completed the acquisition, via stock purchase, of Talon Innovations Corporation (“Talon”), a Minnesota-based leader in the design and manufacturing of high precision machined parts used in leading edge semiconductor tools, for $137.8 million. Talon expanded our capacity and capabilities in the area of component manufacturing for gas and chemical delivery tools used in semiconductor manufacturing and other industrial applications. The following table presents the preliminary purchase price allocation as of December 11, 2017 and the final allocation as of December 28, 2018. Measurement period adjustments recognized in 2018 primarily relate to the fair value of Talon’s opening balance of accounts receivable, inventory, income taxes payable, deferred taxes, developed technology, and other working capital amounts. Preliminary Allocation December 11, 2017 2018 Measurement Period Adjustment Final Allocation December 11, 2018 Cash acquired $ 5,586 $ — $ 5,586 Accounts receivable 11,471 600 12,071 Inventories 19,399 209 19,608 Prepaid expenses and other current assets 182 — 182 Property and equipment 16,655 — 16,655 Other noncurrent assets 76 — 76 Intangible assets 38,000 (2,700 ) 35,300 Goodwill 74,594 892 75,486 Accounts payable (4,706 ) — (4,706 ) Accrued liabilities (2,767 ) 170 (2,597 ) Other current liabilities (1,838 ) 972 (866 ) Deferred tax liabilities (19,652 ) 652 (19,000 ) Total acquisition consideration $ 137,000 $ 795 $ 137,795 We allocated $32.4 million to customer relationships and $2.9 million to intellectual property with weighted average amortization periods of 6 years and 10 years, respectively. Goodwill recognized from the acquisition was primarily attributed to an assembled workforce and expected synergies and is not tax deductible. We incurred transaction costs of $1.5 million in connection with the acquisition during 2017. The fair value adjustment to inventory as part of our purchase price allocation resulted in a $4.5 million and $1.6 million charge to cost of sales during 2018 and 2017, respectively. Our consolidated statement of operations for 2017 includes approximately 3 weeks of Talon operating activity, which is not material to our 2017 results of operations. Cal‑Weld, Inc. On July 27, 2017, we completed the acquisition, via stock purchase, of Cal‑Weld, Inc. (“Cal‑Weld”), a California-based leader in the design and fabrication of precision, high purity industrial components, subsystems, and systems, for $56.2 million. Cal‑Weld expanded our capacity and capabilities in the area of component manufacturing for gas delivery tools used in semiconductor manufacturing. The following table presents the preliminary purchase price allocation as of July 27, 2017 and the final allocation on June 29, 2018. Measurement period adjustments recognized in 2017 and 2018 primarily relate to the fair value of Cal‑Weld’s opening balance of inventory, income taxes payable, and other working capital amounts. Preliminary Allocation July 27, 2017 2017 Measurement Period Adjustment 2018 Measurement Period Adjustment Final Allocation June 29, 2018 Cash acquired $ 7,337 $ — $ — $ 7,337 Accounts receivable 10,318 — — 10,318 Inventories 20,836 — (388 ) 20,448 Prepaid expenses and other current assets 287 113 — 400 Property and equipment 1,639 — — 1,639 Other noncurrent assets 587 — — 587 Intangible assets 12,140 — — 12,140 Goodwill 17,957 (223 ) (143 ) 17,591 Accounts payable (5,991 ) — (5,991 ) Accrued liabilities (2,016 ) 79 (173 ) (2,110 ) Other non-current liabilities (908 ) — — (908 ) Deferred tax liabilities (5,307 ) 31 11 (5,265 ) Total acquisition consideration $ 56,879 $ — $ (693 ) $ 56,186 We allocated $11.5 million to customer relationships and $0.7 million to order backlog with weighted average amortization periods of 6 years and 6 months, respectively. Goodwill recognized from the acquisition was primarily attributed to an assembled workforce and expected synergies and is not tax deductible. We incurred transaction costs of $1.9 million in connection with the acquisition during 2017. The fair value adjustment to inventory as part of our purchase price allocation resulted in a $3.6 million charge to cost of sales during 2017. Our consolidated statement of operations for 2017 includes approximately 5 months of Cal‑Weld operating activity, including revenue of $53.0 million and net income from continuing operations of $6.7 million. Ajax-United Patterns & Molds, Inc. On April 12, 2016, we completed the acquisition, via stock purchase, of Ajax-United Patterns & Molds, Inc. (“Ajax”), a California-based manufacturer of complex plastic and metal products used in the medical, biomedical, semiconductor, data communication and food processing equipment industries, for $17.6 million. The acquisition allows us to manufacture and assemble the complex plastic and metal products required by the medical, biomedical, semiconductor and data communication equipment industries. The following table presents the preliminary purchase price allocation as of April 12, 2016 and the final allocation on April 12, 2017. Measurement period adjustments recognized in 2016 and 2017 are primarily related to finalization of the valuation of deferred tax liabilities and net identifiable assets and liabilities. Preliminary Allocation April 12, 2016 2016 Measurement Period Adjustment 2017 Measurement Period Adjustment Final Allocation April 12, 2017 Cash acquired $ 187 $ — $ — $ 187 Accounts receivable 1,245 5 — 1,250 Inventories 3,236 — — 3,236 Prepaid expenses and other current assets 77 — 8 85 Property and equipment 1,545 — (78 ) 1,467 Other noncurrent assets 2,948 — — 2,948 Intangible assets 8,130 (100 ) — 8,030 Goodwill 4,629 2,449 (22 ) 7,056 Accounts payable and accrued liabilities (4,403 ) (83 ) 9 (4,477 ) Deferred tax liabilities — (2,271 ) 83 (2,188 ) Total acquisition consideration $ 17,594 $ — $ — $ 17,594 We allocated $8.0 million to customer relationships with a weighted average amortization periods of 10 years. Goodwill recognized from the acquisition was primarily attributed to an assembled workforce and expected synergies and is not tax deductible. We incurred transaction costs of $1.5 million in 2016 in connection with the acquisition. Our consolidated statement of operations for 2016 includes approximately 8 months of Ajax operating activity, including revenue of $20.0 million and operating income of $0.6 million. Pro forma financial information has not been provided for the acquisition of Ajax as it was not material to our operations and overall financial position.

Inventories

Inventories	12 Months Ended
	Dec. 28, 2018
Inventory Disclosure [Abstract]
Inventories	Note 3 – Inventories Inventory consists of the following: December 28, 2018 December 29, 2017 Raw materials $ 90,713 $ 91,109 Work in process 20,852 42,186 Finished goods 17,233 27,268 Excess and obsolete adjustment (7,692 ) (6,022 ) Total inventories, net $ 121,106 $ 154,541 The following table presents changes to our excess and obsolete adjustment: Excess and obsolete adjustment Balance at December 25, 2015 $ (6,132 ) Charge to cost of sales (3,921 ) Disposition of inventory 1,973 Balance at December 30, 2016 (8,080 ) Charge to cost of sales (909 ) Disposition of inventory 2,967 Balance at December 29, 2017 (6,022 ) Charge to cost of sales (1,871 ) Disposition of inventory 201 Balance at December 28, 2018 $ (7,692 )

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 28, 2018
Property Plant And Equipment [Abstract]
Property and Equipment	Note 4 – Property and Equipment Property and equipment consist of the following: December 28, 2018 December 29, 2017 Machinery $ 29,885 $ 23,464 Leasehold improvements 15,333 15,329 Computer software, hardware and equipment 4,884 4,551 Office furniture, fixtures and equipment 1,058 868 Vehicles 26 51 Construction-in-process 9,514 2,771 60,700 47,034 Less accumulated depreciation (18,960 ) (12,654 ) Total property and equipment, net $ 41,740 $ 34,380 Depreciation expense for 2018, 2017, and 2016 was $7.7 million, $3.6 million, and $2.5 million, respectively.

Intangible Assets and Goodwill

Intangible Assets and Goodwill	12 Months Ended
	Dec. 28, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Note 5 – Intangible Assets and Goodwill Definite-lived intangible assets consist of the following: December 28, 2018 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (6,781 ) $ — $ 2,909 10.0 years Customer relationships 82,986 (31,308 ) — 51,678 7.8 years Developed technology 2,900 (592 ) — 2,308 10.0 years Total intangible assets $ 95,576 $ (38,681 ) $ — $ 56,895 December 29, 2017 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (5,814 ) $ — $ 3,876 10.0 years Customer relationships 81,427 (20,060 ) — 61,367 7.8 years Developed technology 22,990 (14,938 ) — 8,052 7.7 years Backlog 660 (550 ) — 110 0.5 years Total intangible assets $ 114,767 $ (41,362 ) $ — $ 73,405 Future projected annual amortization expense consists of the following: Future amortization expense 2019 $ 12,579 2020 12,579 2021 12,579 2022 8,765 2023 7,541 Thereafter 2,852 $ 56,895 The following tables present the changes to goodwill: Goodwill Balance at December 25, 2015 $ 70,015 Acquisitions 7,078 Balance at December 30, 2016 77,093 Acquisitions 92,306 Balance at December 29, 2017 169,399 Acquisitions 3,611 Balance at September 28, 2018 $ 173,010

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 28, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 6 – Commitments and Contingencies Operating Leases We lease facilities under various non-cancellable operating leases expiring through 2024. In addition to base rental payments, we are responsible for utilities and our proportionate share of operating expenses. Escalating rental payments are recognized on a straight‑line basis over the lease term. Rent expense for 2018, 2017, and 2016, was $5.5 million, $3.6 million, and $2.9 million, respectively. Future minimum lease payments for non-cancelable operating leases are as follows: Future minimum lease payments 2019 $ 4,910 2020 4,873 2021 4,356 2022 3,820 2023 1,103 Thereafter 120 $ 19,182 Litigation We are periodically involved in legal actions and claims that arise as a result of events that occur in the normal course of operations. The ultimate resolution of these actions is not expected to have a material adverse effect on our financial position or results of operations.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 28, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 7 – Income Taxes In December 2017, the Tax Cuts and Jobs Act (the “2017 Tax Act”) was enacted. The 2017 Tax Act included a number of changes to existing U.S. tax laws that impact us, most notably a reduction of the U.S. corporate income tax rate from 35% to 21% for tax years beginning after December 31, 2017. The 2017 Tax Act also provided for a one‑time transition tax on certain foreign earnings and the acceleration of depreciation for certain assets placed into service after September 27, 2017, and prospective changes beginning in 2018, including the repeal of the domestic manufacturing deduction, acceleration of tax revenue recognition, capitalization of research and development expenditures, additional limitations on executive compensation, and limitations on the deductibility of interest. We recognized the income tax effects of the 2017 Tax Act in our 2017 financial statements in accordance with Staff Accounting Bulletin (“SAB”) No. 118, which provides SEC staff guidance for the application of ASC Topic 740, Income Taxes The changes to existing U.S. tax laws as a result of the 2017 Tax Act, which we believe have the most significant impact on the federal income taxes, are as follows: Reduction of the U.S. Corporate Income Tax Rate We measure deferred tax assets and liabilities using enacted tax rates that will apply in the years in which the temporary differences are expected to be recovered or paid. Accordingly, our deferred tax assets and liabilities were re‑measured in 2017 to reflect the reduction in the U.S. corporate income tax rate from 35% to 21%, resulting in a $5.9 million increase in income tax benefit for 2017 and a corresponding $5.9 million decrease in net deferred tax liabilities at December 29, 2017. Transition Tax on Foreign Earnings In 2017, we recognized a provisional income tax expense of $0.7 million related to the one-time transition tax on certain foreign earnings. This resulted in a corresponding decrease in deferred tax assets due to the utilization of net operating loss carryforwards. This amount was adjusted in 2018 to $0.6 million, resulting in a tax benefit of $0.1 million recorded in 2018. Global Intangible Low-Taxed Income (“GILTI”) Beginning in 2018, a portion of foreign subsidiaries’ earnings, net of a return on investment in tangible assets, are subject to tax in the United States. During 2018, we recognized income tax expense of $0.1 million, net of foreign tax credits, related to GILTI. Foreign Derived Intangible Income (“FDII”) Deduction Beginning in 2018, a deduction is allowed in the United States for a portion of foreign-derived income, net of a return on investment in tangible assets. During 2018, we recognized income tax benefit of $0.2 million related to the FDII deduction. Foreign Tax Credits Beginning in 2018, rules surrounding the utilization and carryforward of foreign tax credits in the United States were changed as a result of the 2017 Tax Act. Due to these changes, we released a valuation allowance on our accrued foreign tax credits which were previously limited under the tax code in effect before the 2017 Tax Act was enacted, resulting in a $4.1 million discrete benefit. Income from continuing operations before tax was as follows: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 United States $ 7,519 $ 370 $ (12,553 ) Foreign 46,700 42,659 32,683 Income from continuing operations before tax $ 54,219 $ 43,029 $ 20,130 Significant components of income tax benefit from continuing operations consist of the following: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Current: Federal $ 861 $ 809 $ — State 316 249 (73 ) Foreign 1,751 397 1,858 Total current tax expense 2,928 1,455 1,785 Deferred: Federal (5,379 ) (13,251 ) (2,213 ) State (667 ) (1,553 ) — Foreign (546 ) (537 ) (221 ) Total deferred tax benefit (6,592 ) (15,341 ) (2,434 ) Income tax benefit from continuing operations $ (3,664 ) $ (13,886 ) $ (649 ) The reconciliation of income tax computed at the U.S. federal statutory tax rates to income tax benefit from continuing operations consist of the following: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Effective rate reconciliation: U.S. federal tax expense $ 11,386 $ 15,060 $ 7,046 State income taxes, net (329 ) (373 ) (324 ) Permanent items 30 2,141 303 Foreign rate differential (1,679 ) (7,498 ) (5,907 ) Tax holiday (7,583 ) (7,437 ) (5,714 ) Credits (1,158 ) (1,818 ) (794 ) Tax contingencies 168 335 86 Share-based compensation (1,270 ) (5,438 ) 185 Withholding tax 727 840 1,435 Impact of re-characterizing intercompany debt to equity — 1,409 — Impact of Tax Cuts and Jobs Act 199 (6,188 ) — Other, net (15 ) (248 ) 168 Valuation allowance (4,140 ) (4,671 ) 2,867 Income tax benefit from continuing operations $ (3,664 ) $ (13,886 ) $ (649 ) Deferred income tax assets and liabilities from continuing operations consist of the following as of: December 28, 2018 December 29, 2017 Deferred tax assets: Inventory $ 3,500 $ 2,825 Share-based compensation 1,295 866 Accrued payroll 896 1,202 Net operating loss carryforwards 534 4,020 Transaction costs 99 63 Tax credits 7,258 5,851 Other assets 1,747 1,956 Deferred tax assets 15,329 16,783 Valuation allowance (112 ) (4,252 ) Total deferred tax assets 15,217 12,531 Deferred tax liabilities: Intangible assets (13,789 ) (18,283 ) Property, plant and equipment (3,687 ) (3,069 ) Other liabilities (344 ) (743 ) Total deferred tax liabilities (17,820 ) (22,095 ) Net deferred tax liability $ (2,603 ) $ (9,564 ) At December 28, 2018, we had federal and state net operating loss carryforwards of $1.0 million and $5.8 million, respectively. The federal and state net operating loss carryforwards, if not utilized, will begin to expire in 2035 and 2032, respectively. At December 28, 2018, we had federal and state research and development credits of $1.7 million and $0.4 million, respectively. The federal and state research and development credits, if not utilized, will begin to expire in 2032 and 2022, respectively. Additionally, we had foreign tax credits of $1.5 million, which if not utilized, will begin to expire in 2022. We have determined the amount of our valuation allowance based on our estimates of taxable income by jurisdiction in which we operate over the periods in which the related deferred tax assets will be recoverable. During 2017, the Company completed the acquisitions of Cal‑Weld and Talon, resulting in a release of valuation allowance against the Company’s net deferred tax assets. During the second quarter of 2018, as part of our evaluation of the 2017 Tax Act, we determined we would be able to utilize our foreign tax credit carryforwards, including our currently generated credits and accrued credits related to intercompany payables. As such, we recognized an addition $4.1 million benefit from releasing the associated valuation allowance. As of December 28, 2018, we believe it is more-likely-than-not that we will realize our U.S. deferred tax assets, with the exception of certain state and foreign net operating loss carryforwards we believe are not likely to be realized within the carryforward period. The Company was granted a tax holiday for its Singapore operations effective 2011 through 2021. The net impact of the tax holiday in Singapore as compared to the Singapore statutory rate was a benefit of $7.6 million, $7.4 million, and $5.7 million during 2018, 2017, and 2016, respectively. Our income tax fluctuates based on the geographic mix of earnings and is calculated quarterly based on actual results pursuant to ASC Topic 740‑270 As of December 28, 2018, we have recognized $2.3 million of unrecognized tax benefits in long-term liabilities and zero unrecognized tax benefits in noncurrent deferred tax liabilities on the accompanying consolidated balance sheet. If recognized, $1.6 million of this amount would impact our effective tax rate. We do not expect a significant decrease to the total amount of unrecognized tax benefits within the next twelve months. Our ongoing practice is to recognize potential accrued interest and penalties related to unrecognized tax benefits within its global operations in income tax benefit. During 2018, we recognized a net increase of approximately $0.1 million in potential interest and penalties associated with uncertain tax positions in the consolidated statements of operations. At December 28, 2018, we had approximately $0.1 million and $0.4 million of interest and penalties, respectively, associated with uncertain tax positions, which are excluded from the unrecognized tax benefits table below. We recognize interest and penalties relating to unrecognized tax benefits as part of its income tax expense. The following table summarizes the activity related to the Company’s unrecognized tax benefits: Unrecognized tax benefits Balance at December 25, 2015 $ 558 Increase in tax positions for current year 118 Decrease in tax positions for prior period (100 ) Balance at December 30, 2016 576 Increase in tax positions for current year 458 Increase in tax positions for prior period 214 Increase in tax positions due to acquisitions 710 Decrease in tax positions for prior period — Impact of Tax Cuts and Jobs Act (48 ) Balance at December 29, 2017 1,910 Increase in tax positions for current year 407 Decreases in tax positions for prior period (61 ) Balance at December 28, 2018 $ 2,256 Our three major filing jurisdictions are the United States, Singapore and Malaysia. We are no longer subject to U.S. Federal examination for tax years ending before 2015, to state examinations before 2014, or to foreign examinations before 2013. However, to the extent allowed by law, the tax authorities may have the right to examine prior periods where net operating losses or tax credits were generated and carried forward, and make adjustments up to the amount of the net operating losses or credit carryforward.

Employee Benefit Programs

Employee Benefit Programs	12 Months Ended
	Dec. 28, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Programs	Note 8 – Employee Benefit Programs 401(k) Plan We sponsor a 401(k) plan available to employees of our U.S.‑based subsidiaries. Participants may make salary deferral contributions not to exceed 50% of a participant’s annual compensation or the maximum amount otherwise allowed by law. Eligible employees receive a discretionary matching contribution equal to 50% of a participant’s deferral, up to an annual maximum of 4% of a participant’s annual compensation. For 2018, 2017, and 2016, matching contributions were $1.5 million, $0.7 million, and $0.3 million, respectively.

Credit Facilities

Credit Facilities	12 Months Ended
	Dec. 28, 2018
Debt Disclosure [Abstract]
Credit Facilities	Note 9 – Credit Facilities Long-term debt consists of the following: December 28, 2018 December 29, 2017 Term loan $ 170,625 $ 179,535 Revolving credit facility 34,162 10,000 Total principal amount of long-term debt 204,787 189,535 Less unamortized debt issuance costs (3,920 ) (2,798 ) Total long-term debt, net 200,867 186,737 Less current portion (8,750 ) (6,490 ) Total long-term debt, less current portion, net $ 192,117 $ 180,247 Maturities of long-term debt consist of the following: Future maturities of long-term debt 2019 $ 8,750 2020 8,750 2021 8,750 2022 8,750 2023 169,787 $ 204,787 The weighted average interest rate across all credit facilities was 4.36%, 4.30%, and 5.04% during 2018, 2017, and 2016, respectively. On August 11, 2015, we entered into a new credit agreement with a syndicate of lenders and repaid all outstanding indebtedness under our previous credit agreement. The credit agreement included a $55.0 million term loan facility and $20.0 million revolving credit facility. We recorded $2.6 million in debt issuance costs associated with the new credit agreement. In April 2016, we acquired Ajax. To fund the acquisition, we amended our credit agreement, increasing the term loan facility by $15.0 million. The amendment did not meet the definition of an extinguishment and was accounted for as a modification. In July 2017, we acquired Cal‑Weld. To fund the acquisition, we amended our credit agreement, increasing the term loan facility by $20.0 million, increasing the revolving credit facility capacity by $20.0 million, and reducing our interest rate. The amendment did not meet the definition of an extinguishment and was accounted for as a modification. In December 2017, we acquired Talon. To fund the acquisition, we amended our credit agreement, increasing the term loan facility by $120.0 million. The amendment did not meet the definition of an extinguishment and was accounted for as a modification. On February 15, 2018, we amended and restated our credit agreement, which replaced our existing credit facilities with a $175.0 million term loan facility and a $125.0 million revolving credit facility. The amendment reduced our interest rate, depending on our leverage ratio, and extended the maturity date. We incurred debt issuance costs of $2.1 million in connection with the amendment. The amendment did not meet the definition of an extinguishment and was accounted for as a modification. Our credit agreement is secured by our tangible and intangible assets and includes customary representations, warranties, and covenants. We are required to maintain a minimum fixed charge coverage ratio of 1.25 : 1 and a maximum leverage ratio 3.00 : 1. Interest is charged at either the Base Rate or the Eurodollar rate (as such terms are defined in the credit agreement) at our option, plus an applicable margin. The Base Rate is equal to the higher of i) the Prime Rate, ii) the Federal Funds Rate plus 0.5%, or iii) the Eurodollar Rate plus 1.00%. The Eurodollar rate is equal to LIBOR. The applicable margin on Base Rate and Eurodollar Rate loans is 0.75‑1.50% and 1.75‑2.50% per annum, respectively, depending on our leverage ratio. We are also charged a commitment fee of 0.20%-0.35% on the unused portion of our revolver. Base Rate interest payments and commitment fees are due quarterly. Eurodollar interest payments are due on the last day of the applicable interest period. At December 28, 2018, the term loan and revolver bore interest at the Eurodollar rate option of 4.34% and 4.54%, respectively. Principal payments of $2.2 million are due on a quarterly basis. The credit agreement matures on February 15, 2023.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 28, 2018
Equity [Abstract]
Shareholders' Equity	Note 10 – Shareholders’ Equity Preferred Shares Prior to the December 2016 IPO, our preferred shares had the following characteristics: Conversion —The holders of preferred shares had the ability to convert to common stock at any time at the option of the holder, and the preferred shares would automatically convert to common stock upon a majority vote of the holders of preferred stock. The conversion price was equal to the ratio of the original issuance price divided by the conversion price. Liquidation preference —In the event of any voluntary or involuntary liquidation, dissolution, or winding up of the Company, preferred shareholders were entitled to receive an amount per share equal to the greater of (i) the original issuance price plus any dividends declared but unpaid or (ii) an amount per share that would have been payable assuming conversion to common stock immediately prior to a liquidation event. Any remaining assets after the initial liquidation preference were to be distributed to common stock holders on a pro rata basis. If our assets were not sufficient for the full liquidation preference, the holders would share in any distribution on a pro rata basis. Voting —Preferred shareholders had voting rights based on the number of shares of common stock into which the preferred shares could convert. Dividends —Preferred shareholders were entitled to receive dividends when and if declared by our Board of Directors. At the IPO, all outstanding preferred shares were converted into 17,722,808 ordinary shares. Share Repurchase Program In February 2018, our Board of Directors authorized a share repurchase program up to $50.0 million under which we may repurchase our ordinary shares in the open market or through privately negotiated transactions, depending on market conditions and other factors. Ordinary shares repurchased are recorded as treasury shares using the cost method on a first-in, first-out basis. In August 2018, our Board of Directors authorized a $50 million increase to the share repurchase program. The following tables details our share repurchases for the periods indicated : Total Number of Shares Repurchased Total Cost of Repurchase Average Price Paid per Share Amount Available Under Repurchase Program (dollars in thousands, except share and per share amounts) Amount available at February 15, 2018 $ 50,000 Quarter ended March 30, 2018 195,750 $ 5,000 $ 25.54 $ 45,000 Quarter ended June 29, 2018 1,061,855 24,970 $ 23.52 $ 20,030 Board authorization, $50 million increase, August 18, 2018 $ 70,030 Quarter ended September 28, 2018 1,424,359 30,348 $ 21.31 $ 39,683 Quarter ended December 28, 2018 1,657,565 29,662 $ 17.89 $ 10,021 Year ended December 28, 2018 4,339,529 $ 89,980 $ 20.73 $ 10,021

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 28, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Note 11 – Related Party Transactions We purchased certain parts from Ajax Foresight Global Manufacturing Sdn. Bhd. (“AFGM”), an investment acquired in conjunction with our acquisition of Ajax We received advisory services from Francisco Partners Management, L.P. (“FPM”), an entity affiliated with certain of our former principal shareholders through our December 2016 IPO, at which time our advisory agreement with FPM was terminated. Under the advisory agreement, we were obligated to pay FPM an annual advisory fee equal to $1.5 million per year. Such advisory fee was waived for all periods presented in which the advisory agreement was effective. We also received consulting services from Francisco Partners Consulting, LLC (“FPC”), an entity that provides consulting services to the private equity funds managed by FPM and their portfolio companies on a dedicated basis, through our December 2016 IPO, at which time our agreement with FPC was terminated and such services ceased. FPC is not an affiliate of us, FPM, or any of our former principal shareholders, and none of our former principal shareholders hold an in interest in FPC. During 2017, we received a refund from FPC for previously paid consulting fees of $0.3 million. During 2016 we paid $0.5 million to FPC for consulting services. On January 10, 2011, PFT entered into a sublease agreement with Precision Flow Inc., which was majority owned by a member of our Board of Directors. During 2016, PFT paid $1.0 million in sublease rent to Precision Flow Inc. This board member resigned in 2016, and therefore no related party relationship exists on a go-forward basis. We had purchases totaling $0.1 million from Ceres, an entity owned by a member of our Board of Directors during 2016. We had sales totaling $0.2 million to Ceres during 2016. This board member resigned in 2016, and therefore no related party relationship exists on a go-forward basis.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 28, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation	Note 12 – Share-Based Compensation 2016 Plan In December 2016, we adopted the 2016 Omnibus Incentive Plan (“the 2016 Plan”). Under the 2016 Plan, 1,888,000 ordinary shares are reserved for issuance. The number of shares reserved for issuance under the 2016 Plan increases annually beginning in fiscal year 2018 by the lesser of (i) 2% of the ordinary shares outstanding on the last day of the immediately preceding fiscal year or (ii) such amount determined by our Board of Directors. Awards may be in the form of options, tandem and non-tandem stock appreciation rights, restricted shares, performance awards, and other share based awards and can be issued to employees, directors, and consultants. Canceled or expired awards under the 2016 Plan are returned to the incentive plan pool for future grants. Awards granted under the 2016 Plan generally have a term of 7 years. Vesting generally occurs 25% on the first anniversary of the date of grant, and quarterly thereafter over the remaining 3 years. Upon vesting of restricted shares, employees may elect to have shares withheld to cover statutory minimum withholding taxes. Shares withheld are not reflected as an issuance of ordinary shares within our consolidated statements of shareholders’ equity, as the shares were never issued, and the associated tax payments are reflected as financing activities within our consolidated statements of cash flows. 2012 Plan In March 2012, we adopted the Ichor Holdings Ltd. 2012 Equity Incentive Plan (the “2012 Plan”). Under the 2012 Plan, we may grant either restricted shares or stock options to employees, directors and consultants. Our Board of Directors initially authorized the issuance of 21,000,000 stock options or restricted shares under the 2012 Plan. On October 25, 2013, our Board of Directors authorized the issuance of an additional 4,000,000 stock options or restricted shares under the 2012 Plan. Canceled or expired stock options or restricted shares are returned to the incentive plan pool for future grants. Stock options granted under the 2012 Plan generally have a term of 7 years. Vesting generally occurs 25% on the first anniversary of the date of grant, and quarterly thereafter over the remaining 3 years. There have been no issuances of equity-based awards under the 2012 Plan since the adoption of the 2016 Plan. On January 18, 2018, in connection with the resignation of our former Chief Financial Officer, certain separation benefits became effective, which included a vesting acceleration of all outstanding and unvested stock options and restricted shares. Consequently, 88,445 stock options and 39,175 restricted shares vested on January 18, 2018. This was accounted for as an equity award modification under ASC Topic 718, resulting in $2.9 million in share-based compensation expense. Stock Options The table below sets forth the weighted average assumptions used to measure the fair value of options granted: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average expected term 5 years 5 years 5 years Risk-free interest rate 2.6 % 1.9 % 1.3 % Dividend yield 0.0 % 0.0 % 0.0 % Volatility 52.6 % 47.7 % 50.0 % The following table summarizes our stock option activity: Number of Stock Options Time vesting Performance vesting Weighted average exercise price per share Weighted average remaining contractual term Aggregate intrinsic value (in thousands) Outstanding, December 29, 2017 1,452,825 215,908 $ 12.87 Granted 773,100 — $ 24.64 Exercised (423,162 ) (150,000 ) $ 9.88 Forfeited (96,322 ) — $ 20.13 Expired — — $ — Outstanding, December 28, 2018 1,706,441 65,908 $ 18.57 4.7 years $ 3,572 Exercisable, December 28, 2018 594,335 65,908 $ 12.05 2.7 years $ 3,186 Fair value information for options granted and the intrinsic value of options exercised are as follows: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average grant-date fair value of options granted $ 11.81 $ 8.52 $ 4.18 Total intrinsic value of options exercised $ 8,744 $ 16,423 N/A At December 28, 2018, total unrecognized share-based compensation expense relating to stock options was $9.7 million, with a weighted average remaining service period of 2.9 years. Restricted Shares The following table summarizes our restricted share activity: Number of Restricted Shares Time vesting Weighted average grant date fair value Unvested, December 29, 2017 153,281 $ 17.53 Granted 122,698 $ 23.89 Vested (83,679 ) $ 15.12 Forfeited — $ — Unvested, December 28, 2018 192,300 $ 22.64 Fair value information for restricted shares granted and vested during is as follows: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average grant-date fair value of shares granted $ 23.89 $ 19.63 $ 9.42 Total fair value of shares vested $ 2,041 $ 634 $ 1,484 At December 28, 2018, total unrecognized share-based compensation expense relating to restricted shares was $3.6 million, with a weighted average remaining service period of 2.8 years. During 2018, 2017, and 2016, share-based compensation expense for stock options and restricted shares across all plans totaled $7.3 million, $2.2 million, and $3.2 million, respectively. 2017 ESPP In May 2017, we adopted the 2017 Employee Stock Purchase Plan (the “2017 ESPP”). The 2017 ESPP grants employees the ability to designate a portion of their base-pay to purchase ordinary shares at a price equal to 85% of the fair market value of our ordinary shares on the first or last day of each 6 month purchase period. Purchase periods begin on January 1 or July 1 and end on June 30 or December 31, or the next business day if such date is not a business day. Shares are purchased on the last day of the purchase period. The table below sets forth the weighted average assumptions used to measure the fair value of 2017 ESPP rights: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average expected term 0.5 years 0.4 years N/A Risk-free interest rate 1.9 % 1.1 % N/A Dividend yield 0.0 % 0.0 % N/A Volatility 52.7 % 47.8 % N/A We recognize share-based compensation expense associated with the 2017 ESPP over the duration of the purchase period. We recognized $0.3 million and $0.1 million of share-based compensation expense associated with the 2017 ESPP during 2018 and 2017, respectively. At December 28, 2018, there was no unrecognized share-based compensation expense.

Segment Information

Segment Information	12 Months Ended
	Dec. 28, 2018
Segment Reporting [Abstract]
Segment Information	Note 13 – Segment Information Our Chief Operating Decision Maker, the Chief Executive Officer, reviews our results of operations on a consolidated level and executive staff is structured by function rather than by product category. Therefore, we operate in one operating segment. Key resources, decisions, and assessment of performance are also analyzed on a company‑wide level. Foreign operations are conducted primarily through our wholly owned subsidiaries in Singapore and Malaysia. Our principal markets include North America, Asia and, to a lesser degree, Europe. Sales by geographic area represent sales to unaffiliated customers. All information on sales by geographic area is based upon the location to which the products were shipped. The following table sets forth sales by geographic area (including sales from discontinued operations): Year Ended December 28, 2018 December 29, 2017 December 30, 2016 United States of America $ 502,750 $ 386,645 $ 243,237 Singapore 224,230 223,277 163,515 Europe 60,688 27,555 16,353 Other 35,943 18,415 9,218 Total net sales $ 823,611 $ 655,892 $ 432,323 The following table sets forth our two major customers, which comprised 88%, 93%, and 97% of net sales from continuing operations in 2018, 2017, and 2016, respectively: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Lam Research $ 458,705 $ 350,372 $ 207,230 Applied Materials $ 262,146 $ 259,234 $ 185,465

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 28, 2018
Earnings Per Share [Abstract]
Earnings per Share	Note 14 – Earnings per Share Basic and diluted net income per share attributable to ordinary shareholders was presented in conformity with the two-class method during 2016, as we had two classes of stock until our December 2016 IPO. We considered our convertible preferred shares to be a participating security as the convertible preferred shares participated in dividends with ordinary shareholders, when and if declared by our Board of Directors. In the event a dividend was paid on ordinary shares, the holders of preferred shares were entitled to a proportionate share of any such dividend as if they were holders of ordinary shares (on an as-if converted basis). The convertible preferred shares did not participate in incurred losses. In accordance with the two-class method, earnings allocated to these participating securities and the related number of outstanding shares of the participating securities, which include contractual participation rights in undistributed earnings, have been excluded from the computation of basic and diluted net income per share attributable to ordinary shareholders. Under the two-class method, net income attributable to ordinary shareholders after deduction of preferred share dividends, if any, is determined by allocating undistributed earnings between the ordinary shares and the participating securities based on their respective rights to receive dividends. Basic net income per share attributable to ordinary shareholders is computed by dividing net income attributable to ordinary shareholders by the weighted-average number of ordinary shares outstanding during the period. All participating securities are excluded from basic weighted-average ordinary shares outstanding. Diluted net income per share attributable to ordinary shareholders is computed by dividing net income attributable to ordinary shareholders by the weighted average number of ordinary shares outstanding, including all potentially dilutive ordinary shares, if the effect of each class of potential shares of ordinary shares is dilutive. For purposes of calculating EPS under the two-class method, an accounting policy election has been made to treat each income statement line item (net income from continuing operations, net income from discontinued operations, and net income) as an independent calculation and only allocate earnings to participating securities for those line items for which income is reported, as the participating securities do not have a contractual obligation to participate in losses. There is therefore no allocation of losses to participating securities for those line items for which a loss is reported. Under this method, the sum of the individual EPS income statement line items will not reconcile to the total net income per share. Net income per share was not presented in conformity with the two ‑ The following table sets forth the computation of our basic and diluted net income (loss) per share attributable to ordinary shareholders and a reconciliation of the numerator and denominator used in the calculation: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Numerator: Net income from continuing operations $ 57,883 $ 56,915 $ 20,779 Undistributed earnings attributed to preferred shareholders — — (19,060 ) Net income from continuing operations, attributable to ordinary shareholders $ 57,883 $ 56,915 $ 1,719 Net loss from discontinued operations $ — $ (461 ) $ (4,117 ) Undistributed earnings attributed to preferred shareholders — — — Net loss from discontinued operations, attributable to ordinary shareholders $ — $ (461 ) $ (4,117 ) Net income $ 57,883 $ 56,454 $ 16,662 Undistributed earnings attributed to preferred shareholders — — (15,284 ) Net income, attributable to ordinary shareholders $ 57,883 $ 56,454 $ 1,378 Denominator: Weighted average ordinary shares outstanding 24,706,542 25,118,031 1,503,296 Dilutive effect of stock options 398,590 1,030,793 306,871 Dilutive effect of restricted shares 20,530 68,184 157,759 Dilutive effect of employee share purchase plan 2,393 1,416 — Weighted average number of shares used in diluted per share calculation for net income and net income from continuing operations 25,128,055 26,218,424 1,967,926 Weighted average ordinary shares outstanding 24,706,542 25,118,031 1,503,296 Dilutive effect of stock options — — — Dilutive effect of restricted shares — — — Dilutive effect of employee share purchase plan — — — Weighted average number of shares used in diluted per share calculation for net loss from discontinued operations 24,706,542 25,118,031 1,503,296 Earnings per share attributable to ordinary shareholders: Net income from continuing operations: Basic $ 2.34 $ 2.27 $ 1.14 Diluted $ 2.30 $ 2.17 $ 0.87 Net loss from discontinued operations: Basic $ — $ (0.02 ) $ (2.74 ) Diluted $ — $ (0.02 ) $ (2.74 ) Net income: Basic $ 2.34 $ 2.25 $ 0.92 Diluted $ 2.30 $ 2.15 $ 0.70 An aggregated total of 516,070, 72,321, and 165,275 potential ordinary shares have been excluded from the computation of diluted net income per share attributable to ordinary shareholders for 2018, 2017, and 2016, respectively, because including them would have been antidilutive.

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 28, 2018
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations	Note 15 – Discontinued Operations In January 2016, we made the decision to shut down our Kingston, New York facility as this location consumed a significant amount of resources while contributing very little income. We completed the shutdown of the operations of the New York facility in May 2016 through abandonment as a buyer for the facility and operation was not found. We recorded lease abandonment and inventory charges of approximately $0.6 million and $2.0 million, respectively, in 2016. In 2017, we accrued for remaining costs of $0.3 million to occupy the facility through its lease expiration in February 2018. The discontinued operation was deemed to be fully disposed of at December 29, 2017. Accordingly, there was no activity associated with the discontinued operation during 2018. The carrying amounts of the major classes of assets and liabilities of our Kingston, New York facility are reflected in the following table: December 29, 2017 Assets Current assets: Prepaid expenses and other current assets $ 3 Total current assets 3 Total assets $ 3 Liabilities Current liabilities: Accounts payable $ 136 Accrued liabilities 255 Other current liabilities 9 Total current liabilities 400 Total liabilities $ 400 The results of the discontinued operation were as follows: Year Ended December 29, 2017 December 30, 2016 Net sales $ — $ 26,576 Cost of sales — 28,077 Operating expenses: Research and development — 262 Selling, general, and administrative 722 2,315 Total operating expenses 722 2,577 Operating loss (722 ) (4,078 ) Other income, net — (1 ) Loss from discontinued operations before income taxes (722 ) (4,077 ) Income tax expense (benefit) (261 ) 40 Loss from discontinued operations $ (461 ) $ (4,117 )

Subsequent Events (unaudited)

Subsequent Events (unaudited)	12 Months Ended
	Dec. 28, 2018
Subsequent Events [Abstract]
Subsequent Events (unaudited)	Note 16 – Subsequent Events (unaudited) Ordinary Share Repurchases In January 2019, we repurchased 97,910 ordinary shares for a total cost of $1.6 million at an average price of $16.34 per share pursuant to our previously announced share repurchase program.

Organization and Summary of S_2

Organization and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 28, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Operations of the Company	Organization and Operations of the Company Ichor Holdings, Ltd. and Subsidiaries (the “we”, “us”, “our”, “Company”) designs, develops, manufactures and distributes gas and liquid delivery subsystems and components purchased by capital equipment manufacturers for use in the semiconductor markets. We are headquartered in Fremont, California and have operations in the United States, United Kingdom, Singapore, Malaysia, and Korea. On December 30, 2011, Ichor Systems Holdings, LLC consummated a sales transaction with Icicle Acquisition Holdings, LLC, a Delaware limited liability company. Shortly after consummation of the sale transaction, Icicle Acquisition Holdings, LLC changed its name to Ichor Holdings, LLC. In March 2012, Ichor Holdings, LLC completed a reorganization of its legal structure, forming Ichor Holdings, Ltd., a Cayman Islands entity. Ichor Holdings, Ltd. is now the reporting entity and the ultimate parent company of the operating entities. In January 2016, we decided to close our Kingston, New York facility which was the primary facility for the Precision Flow Technologies, Inc. (“PFT”) subsidiary. In May 2016, we ceased operations in this facility and ended the relationship with the customer it served in this location. Our consolidated financial statements and accompanying notes for current and prior periods have been retroactively adjusted to present the results of operations of the Precision Flow Technologies, Inc. subsidiary as a discontinued operation. In addition, the assets and liabilities to be disposed of have been treated and classified as a discontinued operation. For more information on the discontinued operation see Note 15 – Discontinued Operations
Basis of Presentation	Basis of Presentation These consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). All intercompany balances and transactions have been eliminated upon consolidation. All financial figures presented in the notes to consolidated financial statements are in thousands, except share, per share, and percentage figures. These consolidated financial statements include the following wholly owned subsidiaries of Ichor Holdings, Ltd.: Name of Subsidiary Jurisdiction of Incorporation, Organization, or Formation Ichor Intermediate Holdings, Ltd. Cayman Islands Icicle Acquisition Holding Co-op Netherlands Icicle Acquisition Holding B.V. Netherlands Ichor Holdings Ltd. Scotland Ichor Systems Ltd. Scotland Ichor Holdings, LLC Delaware Ichor Systems, Inc. Delaware Ichor Systems Korea Ltd. Korea Ichor Systems Malaysia Sdn Bhd Malaysia Ichor Systems Singapore, PTE Ltd. Singapore Precision Flow Technologies, Inc. New York Ajax-United Patterns & Molds, Inc. California Cal-Weld, Inc. California Talon Innovations Corporations Minnesota Talon Innovations (FL) Corporation Florida Talon Innovations Korea Korea IAN Engineering Co., Ltd. Korea
Public Offering	Public Offering On December 14, 2016, we completed an initial public offering (“IPO”) of 5,877,778 ordinary shares at a price to the public of $9.00 per share. We received net proceeds from the offering of $47.1 million after offering fees and expenses. The net proceeds were used to repay $40.0 million of loans outstanding under our Credit Facilities. In January 2017, we received $7.3 million, net of fees and expenses, from the exercise of the underwriters’ over‑allotment option to sell an additional 881,667 ordinary shares.
Year End	Year End We use a 52 or 53 week fiscal year ending on the last Friday in December. The years ended December 28, 2018 and December 29, 2017 were both 52 weeks. The year ended December 30, 2016 was 53 weeks. All references to 2018, 2017, and 2016 are references to the fiscal years then ended.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods presented. We base our estimates and judgments on historical experience and on various other assumptions that we believe are reasonable under the circumstances. Actual results could differ from the estimates made by management. Significant estimates include the fair value of assets and liabilities acquired in acquisitions, estimated useful lives for long-lived assets, allowance for doubtful accounts, inventory valuation, uncertain tax positions, fair value assigned to stock options granted, and impairment analysis for both definite-lived intangible assets and goodwill.
Revenue Recognition	Revenue Recognition We recognize revenue when control of promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. This amount is recorded as net sales in our consolidated statements of operations. Transaction price – In most of our contracts, prices are generally determined by a customer-issued purchase order and generally remain fixed over the duration of the contract. Certain contracts contain variable consideration, including early-payment discounts and rebates. When a contract includes variable consideration, we evaluate the estimate of the variable consideration to determine whether the estimate needs to be constrained; therefore, we include the variable consideration in the transaction price only to the extent that it is probable that a significant reversal will not occur. Variable consideration estimates are updated at each reporting date. Historically, we have not incurred significant costs to obtain a contract. All amounts billed to a customer relating to shipping and handling are classified as net sales, while all costs incurred by us for shipping and handling are classified as cost of goods sold. Performance obligations – Substantially all of our performance obligations pertain to promised goods (“products”), which are primarily comprised of fluid delivery subsystems, weldments, and other components. Most of our contracts contain a single performance obligation and are generally completed within twelve months. Product sales are recognized at a point-in-time, generally upon delivery, as such term is defined within the contract, as that is when control of the promised good has transferred. Products are covered by a standard assurance warranty, generally extended for a period of one to two years depending on the customer, which promises that delivered products conform to contract specifications. As such, we account for such warranties under ASC 460, Guarantees , and not as a separate performance obligation . Contract balances – Accounts receivable represents our unconditional right to receive consideration from our customers. Accounts receivable are carried at invoice price less an estimate for doubtful accounts and estimated payment discounts. Payment terms vary by customer but are generally due within 15‑60 days. Historically, we have not incurred significant payment issues with our customers. We had no significant contract assets or liabilities on our consolidated balance sheets in any of the periods presented
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that subject us to credit risk consist of accounts receivable, accounts payable and long-term debt. At December 28, 2018 and December 29, 2017, two customers represented, in the aggregate, approximately 40% and 61%, respectively, of the balance of accounts receivable. We establish an allowance for doubtful accounts based upon the credit risk of specific customers, historical trends, and other information. Activity and balances related to the allowance for doubtful accounts is as follows: Allowance for doubtful accounts Balance at December 25, 2015 $ 123 Charges to costs and expenses 71 Write-offs — Balance at December 30, 2016 194 Charges to costs and expenses 62 Write-offs — Balance at December 29, 2017 256 Charges to costs and expenses 195 Write-offs and recoveries (111 ) Balance at December 28, 2018 $ 340 We require collateral, typically cash, in the normal course of business if customers do not meet the criteria established for offering credit. If the financial condition of our customers were to deteriorate and result in an impaired ability to make payments, additions to the allowance may be required. Accounts receivable are written off when deemed uncollectible. Recoveries of accounts receivable previously written off are recorded to income when received. We use qualified manufacturers to supply many components and subassemblies of our products. We obtain the majority of our components from a limited group of suppliers. A majority of the purchased components used in our products are customer specified. An interruption in the supply of a particular component would have a temporary adverse impact on our operating results. We maintain cash balances at both United States-based and foreign-based commercial banks. Cash balances in the United States exceed amounts that are insured by the Federal Deposit Insurance Corporation (FDIC). The majority of the cash maintained in foreign-based commercial banks is insured by the government where the foreign banking institutions are based. Cash held in foreign-based commercial banks totaled $25.5 million and $36.4 million at December 28, 2018 and December 29, 2017, respectively, and at times exceeds insured amounts. No losses have been incurred at December 28, 2018 and December 29, 2017 for amounts exceeding the insured limits.
Fair Value Measurements	Fair Value Measurements We estimate the fair value of financial assets and liabilities based upon comparison of such assets and liabilities to the current market values for instruments of a similar nature and degree of risk. We utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible. We determine fair value based on assumptions that market participants would use in pricing an asset or liability in the principal or most advantageous market. When considering market participant assumptions in fair value measurements, the following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the following levels: ▪ Level 1 Inputs: Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date ▪ Level 2 Inputs: Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability ▪ Level 3 Inputs: Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date There were no changes to our valuation techniques during 2018. We estimate that the recorded value of our financial assets and liabilities approximate fair value at December 28, 2018 and December 29, 2017. We estimate the value of intangible assets on a nonrecurring basis based on an income approach utilizing discounted cash flows. Under this approach, we estimate the future cash flows from our asset groups and discount the income stream to its present value to arrive at fair value. Future cash flows are based on recently prepared operating forecasts. Operating forecasts and cash flows include, among other things, revenue growth rates that are calculated based on management’s forecasted sales projections. A discount rate is utilized to convert the forecasted cash flows to their present value equivalent. The discount rate applied to the future cash flows includes a subject-company risk premium, an equity market risk premium, a beta, and a risk-free rate. As this approach contains unobservable inputs, the measurement of fair value for intangible assets is classified as Level 3.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value. The majority of inventory values are based upon average costs. We analyze inventory levels and record write-downs for inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value, and inventory in excess of expected customer demand. We assess the valuation of all inventories, including raw materials, work-in-process, finished goods and spare parts on a periodic basis. Obsolete inventory or inventory in excess of our estimated usage is written down to its estimated market value less costs to sell, if less than its cost. Inherent in our estimates of demand and market value in determining inventory valuation are estimates related to economic trends, future demand for our products and technological obsolescence of our products. If actual demand and market conditions are less favorable than our projections, additional inventory write-downs may be required. If the inventory value is written down to its net realizable value, and subsequently there is an increased demand for the inventory at a higher value, the increased value of the inventory is not realized until the inventory is sold either as a component of a subsystem or as separate inventory.
Property and Equipment	Property and Equipment Property, plant and equipment are stated at cost, less accumulated depreciation. Depreciation is computed using the straight-line method over the following estimated useful lives: Estimated useful lives of PP&E Machinery 5-10 years Leasehold improvements Lesser of 10 years or lease term Computer software, hardware, and equipment 3-5 years Office furniture, fixtures, and equipment 5-7 years Vehicles 5 years Maintenance and repairs that neither add materially to the value of the asset nor appreciably prolong its useful life are charged to expense as incurred. Gains or losses on the disposal of property and equipment are included in selling, general and administrative expenses on the consolidated statements of operations.
Long-Lived Assets	Long-Lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate, in management’s judgment, that the carrying amount of an asset (or asset group) may not be recoverable. In analyzing potential impairments, projections of future cash flows from the asset group are used to estimate fair value. If the sum of the expected future undiscounted cash flows is less than the carrying amount of the asset group, a loss is recognized for the difference between the estimated fair value and the carrying value of the asset group. The projections are based on assumptions, judgments and estimates of revenue growth rates for the related business, anticipated future economic, regulatory and political conditions, the assignment of discount rates relative to risk, and estimates of terminal values. At December 28, 2018 and December 29, 2017, intangible assets passed the recoverability test resulting in no impairment.
Intangible Assets	Intangible Assets We account for intangible assets that have a definite life and are amortized on a basis consistent with their expected cash flows over the following estimated useful lives: Estimated useful lives of intangibles Trademarks 10 years Customer relationships 6-10 years Developed technology 7-10 years
Goodwill	Goodwill Goodwill represents the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. We review goodwill for impairment annually and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. We first make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying a quantitative goodwill impairment test. Under the quantitative test, the fair value of the reporting unit is compared to its carrying value and an impairment loss is recognized for any excess of carrying amount over the reporting unit’s fair value. Fair value of the reporting unit is determined using a discounted cash flow analysis. For purposes of testing goodwill for impairment, we have concluded that we operate as one reporting unit. We performed a qualitative goodwill assessment at December 28 2018 and December 29, 2017. This assessment indicated that it was more likely than not our reporting unit’s fair value exceeded its carrying value.
Research and Development Costs	Research and Development Costs Research and development costs are expensed as incurred.
Special Bonus	Special Bonus On August 11, 2015, our Board of Directors instituted a special bonus to certain members of management totaling $3.1 million. In December 2016 our Board of Directors approved that all remaining special bonus not yet earned had been earned, resulting in a $0.6 million expense in 2016. There were no such bonuses instituted in 2018 or 2017.
Share-Based Payments	Share-Based Payments We use the Black-Scholes option-pricing model to value the awards on the date of grant. We use the simplified method to estimate the expected term of share-based awards for all periods as we do not have sufficient history to estimate the weighted average expected term. The risk-free interest rate is based on the U.S. Treasury rates in effect on the corresponding date of grant. Estimated volatility is based on the historical volatility of ours and similar entities’ publicly traded shares.
Income Taxes	Income Taxes We recognize deferred income taxes using the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred income taxes are recognized for differences between the financial reporting and tax bases of assets and liabilities at enacted statutory tax rates in effect for the years in which the differences are expected to reverse. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. Income tax benefit for the current year differs from the statutory rate primarily as a result of the impact of foreign operations and discrete tax benefits recorded in connection with our historical acquisitions, stock option exercises, and the release of the valuation allowance against certain foreign tax credits that are now expected to be utilized as a result of the analysis performed related to the Tax Cuts and Jobs Act passed in 2017. When tax returns are filed, it is highly certain that some positions taken would be sustained upon examination by the taxing authorities, while others may be subject to uncertainty about the merits of the position taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the consolidated financial statements in the period during which, based on all available evidence, management believes it is more likely than not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. Tax positions taken are not offset or aggregated with other positions. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefit that is more than 50% likely of being realized upon settlement with the applicable taxing authority. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above is reflected as a liability for unrecognized tax benefits in our consolidated balance sheets along with any associated interest and penalties that would be payable to the taxing authorities upon examination. We recognize interest and penalties as a component of income tax expense.
Foreign Operations	Foreign Operations The functional currency of our international subsidiaries located in the United Kingdom, Singapore, and Malaysia, is the U.S. dollar. Transactions denominated in currencies other than the functional currency generate foreign exchange gains and losses that are included in other income, net on our consolidated statements of operations. Substantially, all of our sales and agreements with third-party suppliers provide for pricing and payments in U.S. dollars and, therefore, are not subject to material exchange rate fluctuations. Foreign operations consist of revenue of $379.1 million, $346.0 million, and $241.7 million during 2018, 2017, and 2016, respectively. Assets of foreign operations totaled $157.0 million and $127.2 million at December 29, 2017 and December 30, 2016, respectively.
Accounting Pronouncements Recently Adopted	Accounting Pronouncements Recently Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Updated (“ASU”) 2014‑09, Revenue from Contracts with Customers (Topic 606) We adopted Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers , on December 30, 2017, the first day of fiscal year 2018, using the modified retrospective method. After assessing our contracts with our customers, we determined that there was not a significant change to the nature, timing, and extent of our revenues under the new standard. Accordingly, we did not make a cumulative-effect adjustment to retained earnings on December 30, 2017, as there was no adjustment to be made. In August 2016, the FASB issued ASU 2016‑15, Statement of Cash Flows – Classification of Certain Cash Receipts and Cash Payments . The amendment provides and clarifies guidance on the classification of certain cash receipts and cash payments in the statement of cash flows to eliminate diversity in practice. We adopted ASU 2016-15 on December 30, 2017, the first day of fiscal year 2018, which did not have a significant impact on our consolidated financial statements. In January 2017, the FASB issued ASU 2017‑01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The amendments in this update clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. We adopted ASU 2017‑01 on December 30, 2017, the first day of fiscal year 2018, which did not have a significant impact on our consolidated financial statements. In May 2017, the FASB issued ASU 2017‑09, Compensation-Stock Compensation (Topic 718) – Scope of Modification Accounting , which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. We adopted ASU 2017‑09 on December 30, 2017, the first day of fiscal year 2018, which did not have a significant impact on our consolidated financial statements. Accounting Pronouncements Recently Issued In February 2016, the FASB issued ASU 2016‑02, Leases (Topic 842) , which consists of a comprehensive lease accounting standard. Under the new standard, assets and liabilities arising from most leases will be recognized on the balance sheet. Leases will be classified as either operating or financing, and the lease classification will determine whether expense is recognized on a straight-line basis (operating leases) or based on an effective interest method (financing leases). The standard also contains expanded disclosure requirements regarding the amounts, timing, and uncertainties of cash flows related to leasing activities. The new standard is effective for interim and annual periods beginning after December 15, 2018. In July 2018, the FASB issued ASU 2018‑11, Leases (Topic 842): Targeted Improvements , which provides an optional transition method allowing entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We plan to use the optional transition method and apply the lease standard as of December 29, 2018, the first day of fiscal year 2019. The new standard provides a number of practical expedients in transition. We will elect the package of practical expedients, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification, and initial direct costs. We will elect to not recognize short-term leases, those with an initial term of 12 months or less, on our consolidated balance sheets. We expect the new standard to have a material effect on our consolidated financial statements. While we continue to assess all of the effects of adoption, we currently believe the most significant effects relate to the recognition of new right-of-use (“ROU”) assets and lease liabilities on our balance sheet for our facilities operating leases and the new disclosure requirements about our leasing activities. Upon adoption of the standard, we anticipate recording lease liabilities and ROU assets to our consolidated balance sheet of approximately $17‑22 million. We do not anticipate a significant cumulative-effect adjustment to the opening balance of retained earnings, and we don’t anticipate the standard to have a material impact on our consolidated statements of income or cash flows. We are evaluating the disclosure requirements and collecting the relevant data in preparation for disclosure in our first quarter 2019 consolidated financial statements, and we are continuing to review our existing contracts for potential embedded leases. In June 2018, the FASB issued ASU 2018‑07, Compensation-Stock Compensation (Topic 718): Improvements to Non-Employee Share-Based Payment Accounting . This standard is intended to reduce cost and complexity and to improve financial reporting for share-based payments issued to nonemployees. ASU 2018‑07 expands the scope of ASC Topic 718, which currently only includes share-based payments issued to employees, to also include share-based payments issued to nonemployees for goods and services. The provisions are effective for annual periods beginning after December 15, 2018. We do not expect this ASU to have a material impact on our consolidated financial statements.

Organization and Summary of S_3

Organization and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 28, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	We establish an allowance for doubtful accounts based upon the credit risk of specific customers, historical trends, and other information. Activity and balances related to the allowance for doubtful accounts is as follows: Allowance for doubtful accounts Balance at December 25, 2015 $ 123 Charges to costs and expenses 71 Write-offs — Balance at December 30, 2016 194 Charges to costs and expenses 62 Write-offs — Balance at December 29, 2017 256 Charges to costs and expenses 195 Write-offs and recoveries (111 ) Balance at December 28, 2018 $ 340
Property Plant and Equipment Estimated Useful Lives	Property, plant and equipment are stated at cost, less accumulated depreciation. Depreciation is computed using the straight-line method over the following estimated useful lives: Estimated useful lives of PP&E Machinery 5-10 years Leasehold improvements Lesser of 10 years or lease term Computer software, hardware, and equipment 3-5 years Office furniture, fixtures, and equipment 5-7 years Vehicles 5 years
Schedule of Finite Lived Intangible Assets Useful Lives	We account for intangible assets that have a definite life and are amortized on a basis consistent with their expected cash flows over the following estimated useful lives: Estimated useful lives of intangibles Trademarks 10 years Customer relationships 6-10 years Developed technology 7-10 years

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 28, 2018
Business Combinations [Abstract]
Measurement Period Adjustments Related to Finalization of Valuation of Deferred Tax Liabilities and Net Identifiable Assets and Liabilities	The following table presents the preliminary purchase price allocation as of April 19, 2018 and December 28, 2018. Measurement period adjustments recognized in 2018 relate to the fair value of IAN’s opening balance of deferred taxes. Preliminary Allocation April 19, 2018 2018 Measurement Period Adjustment Preliminary Allocation December 28, 2018 Cash acquired $ 3,952 $ — $ 3,952 Accounts receivable 863 — 863 Inventories 1,870 — 1,870 Prepaid expenses and other current assets 56 — 56 Property and equipment 396 — 396 Other noncurrent assets 101 — 101 Intangible assets 1,559 — 1,559 Goodwill 2,856 6 2,862 Accounts payable (4,193 ) — (4,193 ) Accrued and other current liabilities (452 ) — (452 ) Deferred tax liabilities (383 ) (6 ) (389 ) Other non-current liabilities (82 ) — (82 ) Total acquisition consideration $ 6,543 $ — $ 6,543 The following table presents the preliminary purchase price allocation as of December 11, 2017 and the final allocation as of December 28, 2018. Measurement period adjustments recognized in 2018 primarily relate to the fair value of Talon’s opening balance of accounts receivable, inventory, income taxes payable, deferred taxes, developed technology, and other working capital amounts. Preliminary Allocation December 11, 2017 2018 Measurement Period Adjustment Final Allocation December 11, 2018 Cash acquired $ 5,586 $ — $ 5,586 Accounts receivable 11,471 600 12,071 Inventories 19,399 209 19,608 Prepaid expenses and other current assets 182 — 182 Property and equipment 16,655 — 16,655 Other noncurrent assets 76 — 76 Intangible assets 38,000 (2,700 ) 35,300 Goodwill 74,594 892 75,486 Accounts payable (4,706 ) — (4,706 ) Accrued liabilities (2,767 ) 170 (2,597 ) Other current liabilities (1,838 ) 972 (866 ) Deferred tax liabilities (19,652 ) 652 (19,000 ) Total acquisition consideration $ 137,000 $ 795 $ 137,795 The following table presents the preliminary purchase price allocation as of July 27, 2017 and the final allocation on June 29, 2018. Measurement period adjustments recognized in 2017 and 2018 primarily relate to the fair value of Cal‑Weld’s opening balance of inventory, income taxes payable, and other working capital amounts. Preliminary Allocation July 27, 2017 2017 Measurement Period Adjustment 2018 Measurement Period Adjustment Final Allocation June 29, 2018 Cash acquired $ 7,337 $ — $ — $ 7,337 Accounts receivable 10,318 — — 10,318 Inventories 20,836 — (388 ) 20,448 Prepaid expenses and other current assets 287 113 — 400 Property and equipment 1,639 — — 1,639 Other noncurrent assets 587 — — 587 Intangible assets 12,140 — — 12,140 Goodwill 17,957 (223 ) (143 ) 17,591 Accounts payable (5,991 ) — (5,991 ) Accrued liabilities (2,016 ) 79 (173 ) (2,110 ) Other non-current liabilities (908 ) — — (908 ) Deferred tax liabilities (5,307 ) 31 11 (5,265 ) Total acquisition consideration $ 56,879 $ — $ (693 ) $ 56,186 The following table presents the preliminary purchase price allocation as of April 12, 2016 and the final allocation on April 12, 2017. Measurement period adjustments recognized in 2016 and 2017 are primarily related to finalization of the valuation of deferred tax liabilities and net identifiable assets and liabilities. Preliminary Allocation April 12, 2016 2016 Measurement Period Adjustment 2017 Measurement Period Adjustment Final Allocation April 12, 2017 Cash acquired $ 187 $ — $ — $ 187 Accounts receivable 1,245 5 — 1,250 Inventories 3,236 — — 3,236 Prepaid expenses and other current assets 77 — 8 85 Property and equipment 1,545 — (78 ) 1,467 Other noncurrent assets 2,948 — — 2,948 Intangible assets 8,130 (100 ) — 8,030 Goodwill 4,629 2,449 (22 ) 7,056 Accounts payable and accrued liabilities (4,403 ) (83 ) 9 (4,477 ) Deferred tax liabilities — (2,271 ) 83 (2,188 ) Total acquisition consideration $ 17,594 $ — $ — $ 17,594

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 28, 2018
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventory consists of the following: December 28, 2018 December 29, 2017 Raw materials $ 90,713 $ 91,109 Work in process 20,852 42,186 Finished goods 17,233 27,268 Excess and obsolete adjustment (7,692 ) (6,022 ) Total inventories, net $ 121,106 $ 154,541
Summary of changes to company's excess and obsolete adjustment	The following table presents changes to our excess and obsolete adjustment: Excess and obsolete adjustment Balance at December 25, 2015 $ (6,132 ) Charge to cost of sales (3,921 ) Disposition of inventory 1,973 Balance at December 30, 2016 (8,080 ) Charge to cost of sales (909 ) Disposition of inventory 2,967 Balance at December 29, 2017 (6,022 ) Charge to cost of sales (1,871 ) Disposition of inventory 201 Balance at December 28, 2018 $ (7,692 )

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 28, 2018
Property Plant And Equipment [Abstract]
Summary of Property and Equipment	Property and equipment consist of the following: December 28, 2018 December 29, 2017 Machinery $ 29,885 $ 23,464 Leasehold improvements 15,333 15,329 Computer software, hardware and equipment 4,884 4,551 Office furniture, fixtures and equipment 1,058 868 Vehicles 26 51 Construction-in-process 9,514 2,771 60,700 47,034 Less accumulated depreciation (18,960 ) (12,654 ) Total property and equipment, net $ 41,740 $ 34,380

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 28, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Definite-Lived Intangible Assets	Definite-lived intangible assets consist of the following: December 28, 2018 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (6,781 ) $ — $ 2,909 10.0 years Customer relationships 82,986 (31,308 ) — 51,678 7.8 years Developed technology 2,900 (592 ) — 2,308 10.0 years Total intangible assets $ 95,576 $ (38,681 ) $ — $ 56,895 December 29, 2017 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (5,814 ) $ — $ 3,876 10.0 years Customer relationships 81,427 (20,060 ) — 61,367 7.8 years Developed technology 22,990 (14,938 ) — 8,052 7.7 years Backlog 660 (550 ) — 110 0.5 years Total intangible assets $ 114,767 $ (41,362 ) $ — $ 73,405
Estimated Amortization Expense of Intangible Assets	Future projected annual amortization expense consists of the following: Future amortization expense 2019 $ 12,579 2020 12,579 2021 12,579 2022 8,765 2023 7,541 Thereafter 2,852 $ 56,895
Schedule of Changes in Goodwill	The following tables present the changes to goodwill: Goodwill Balance at December 25, 2015 $ 70,015 Acquisitions 7,078 Balance at December 30, 2016 77,093 Acquisitions 92,306 Balance at December 29, 2017 169,399 Acquisitions 3,611 Balance at September 28, 2018 $ 173,010

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 28, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Minimum Lease Payment for Non-Cancelable Opereating Leases	Future minimum lease payments for non-cancelable operating leases are as follows: Future minimum lease payments 2019 $ 4,910 2020 4,873 2021 4,356 2022 3,820 2023 1,103 Thereafter 120 $ 19,182

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 28, 2018
Income Tax Disclosure [Abstract]
Schedule of income from continuing operations before tax	Income from continuing operations before tax was as follows: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 United States $ 7,519 $ 370 $ (12,553 ) Foreign 46,700 42,659 32,683 Income from continuing operations before tax $ 54,219 $ 43,029 $ 20,130
Schedule of significant components of income tax benefit from continuing operations	Significant components of income tax benefit from continuing operations consist of the following: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Current: Federal $ 861 $ 809 $ — State 316 249 (73 ) Foreign 1,751 397 1,858 Total current tax expense 2,928 1,455 1,785 Deferred: Federal (5,379 ) (13,251 ) (2,213 ) State (667 ) (1,553 ) — Foreign (546 ) (537 ) (221 ) Total deferred tax benefit (6,592 ) (15,341 ) (2,434 ) Income tax benefit from continuing operations $ (3,664 ) $ (13,886 ) $ (649 )
Summary of reconciliation of income tax computed at U.S. federal statutory tax rates to income tax benefit from continuing operations	The reconciliation of income tax computed at the U.S. federal statutory tax rates to income tax benefit from continuing operations consist of the following: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Effective rate reconciliation: U.S. federal tax expense $ 11,386 $ 15,060 $ 7,046 State income taxes, net (329 ) (373 ) (324 ) Permanent items 30 2,141 303 Foreign rate differential (1,679 ) (7,498 ) (5,907 ) Tax holiday (7,583 ) (7,437 ) (5,714 ) Credits (1,158 ) (1,818 ) (794 ) Tax contingencies 168 335 86 Share-based compensation (1,270 ) (5,438 ) 185 Withholding tax 727 840 1,435 Impact of re-characterizing intercompany debt to equity — 1,409 — Impact of Tax Cuts and Jobs Act 199 (6,188 ) — Other, net (15 ) (248 ) 168 Valuation allowance (4,140 ) (4,671 ) 2,867 Income tax benefit from continuing operations $ (3,664 ) $ (13,886 ) $ (649 )
Schedule of deferred income tax assets and liabilities from continuing operations	Deferred income tax assets and liabilities from continuing operations consist of the following as of: December 28, 2018 December 29, 2017 Deferred tax assets: Inventory $ 3,500 $ 2,825 Share-based compensation 1,295 866 Accrued payroll 896 1,202 Net operating loss carryforwards 534 4,020 Transaction costs 99 63 Tax credits 7,258 5,851 Other assets 1,747 1,956 Deferred tax assets 15,329 16,783 Valuation allowance (112 ) (4,252 ) Total deferred tax assets 15,217 12,531 Deferred tax liabilities: Intangible assets (13,789 ) (18,283 ) Property, plant and equipment (3,687 ) (3,069 ) Other liabilities (344 ) (743 ) Total deferred tax liabilities (17,820 ) (22,095 ) Net deferred tax liability $ (2,603 ) $ (9,564 )
Summarizes activity related to company's unrecognized tax benefits	The following table summarizes the activity related to the Company’s unrecognized tax benefits: Unrecognized tax benefits Balance at December 25, 2015 $ 558 Increase in tax positions for current year 118 Decrease in tax positions for prior period (100 ) Balance at December 30, 2016 576 Increase in tax positions for current year 458 Increase in tax positions for prior period 214 Increase in tax positions due to acquisitions 710 Decrease in tax positions for prior period — Impact of Tax Cuts and Jobs Act (48 ) Balance at December 29, 2017 1,910 Increase in tax positions for current year 407 Decreases in tax positions for prior period (61 ) Balance at December 28, 2018 $ 2,256

Credit Facilities (Tables)

Credit Facilities (Tables)	12 Months Ended
	Dec. 28, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consists of the following: December 28, 2018 December 29, 2017 Term loan $ 170,625 $ 179,535 Revolving credit facility 34,162 10,000 Total principal amount of long-term debt 204,787 189,535 Less unamortized debt issuance costs (3,920 ) (2,798 ) Total long-term debt, net 200,867 186,737 Less current portion (8,750 ) (6,490 ) Total long-term debt, less current portion, net $ 192,117 $ 180,247
Schedule of Maturities Long-Term Debt	Maturities of long-term debt consist of the following: Future maturities of long-term debt 2019 $ 8,750 2020 8,750 2021 8,750 2022 8,750 2023 169,787 $ 204,787

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 28, 2018
Equity [Abstract]
Summary of Share Repurchases	The following tables details our share repurchases for the periods indicated : Total Number of Shares Repurchased Total Cost of Repurchase Average Price Paid per Share Amount Available Under Repurchase Program (dollars in thousands, except share and per share amounts) Amount available at February 15, 2018 $ 50,000 Quarter ended March 30, 2018 195,750 $ 5,000 $ 25.54 $ 45,000 Quarter ended June 29, 2018 1,061,855 24,970 $ 23.52 $ 20,030 Board authorization, $50 million increase, August 18, 2018 $ 70,030 Quarter ended September 28, 2018 1,424,359 30,348 $ 21.31 $ 39,683 Quarter ended December 28, 2018 1,657,565 29,662 $ 17.89 $ 10,021 Year ended December 28, 2018 4,339,529 $ 89,980 $ 20.73 $ 10,021

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 28, 2018
Schedule of Assumptions Used for Estimating Fair Value of Options	The table below sets forth the weighted average assumptions used to measure the fair value of options granted: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average expected term 5 years 5 years 5 years Risk-free interest rate 2.6 % 1.9 % 1.3 % Dividend yield 0.0 % 0.0 % 0.0 % Volatility 52.6 % 47.7 % 50.0 %
Schedule of Stock Option Activity	The following table summarizes our stock option activity: Number of Stock Options Time vesting Performance vesting Weighted average exercise price per share Weighted average remaining contractual term Aggregate intrinsic value (in thousands) Outstanding, December 29, 2017 1,452,825 215,908 $ 12.87 Granted 773,100 — $ 24.64 Exercised (423,162 ) (150,000 ) $ 9.88 Forfeited (96,322 ) — $ 20.13 Expired — — $ — Outstanding, December 28, 2018 1,706,441 65,908 $ 18.57 4.7 years $ 3,572 Exercisable, December 28, 2018 594,335 65,908 $ 12.05 2.7 years $ 3,186
Schedule of Fair Value of Options Granted and Intrinsic Value of Options Exercised	Fair value information for options granted and the intrinsic value of options exercised are as follows: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average grant-date fair value of options granted $ 11.81 $ 8.52 $ 4.18 Total intrinsic value of options exercised $ 8,744 $ 16,423 N/A
Schedule of Restricted Share Activity	The following table summarizes our restricted share activity: Number of Restricted Shares Time vesting Weighted average grant date fair value Unvested, December 29, 2017 153,281 $ 17.53 Granted 122,698 $ 23.89 Vested (83,679 ) $ 15.12 Forfeited — $ — Unvested, December 28, 2018 192,300 $ 22.64
Schedule of Fair Value Information for Restricted Shares Granted and Vested	Fair value information for restricted shares granted and vested during is as follows: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average grant-date fair value of shares granted $ 23.89 $ 19.63 $ 9.42 Total fair value of shares vested $ 2,041 $ 634 $ 1,484
2017 Employee Stock Purchase Plan
Schedule of Weighted Average Assumption used to Measure Fair Value	The table below sets forth the weighted average assumptions used to measure the fair value of 2017 ESPP rights: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Weighted average expected term 0.5 years 0.4 years N/A Risk-free interest rate 1.9 % 1.1 % N/A Dividend yield 0.0 % 0.0 % N/A Volatility 52.7 % 47.8 % N/A

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 28, 2018
Segment Reporting [Abstract]
Schedule of Sales By Geographic Area (Including Sales from Discontinued Operations)	The following table sets forth sales by geographic area (including sales from discontinued operations): Year Ended December 28, 2018 December 29, 2017 December 30, 2016 United States of America $ 502,750 $ 386,645 $ 243,237 Singapore 224,230 223,277 163,515 Europe 60,688 27,555 16,353 Other 35,943 18,415 9,218 Total net sales $ 823,611 $ 655,892 $ 432,323
Summary of Segment Information Major Customers	The following table sets forth our two major customers, which comprised 88%, 93%, and 97% of net sales from continuing operations in 2018, 2017, and 2016, respectively: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Lam Research $ 458,705 $ 350,372 $ 207,230 Applied Materials $ 262,146 $ 259,234 $ 185,465

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 28, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Ordinary Shareholders	The following table sets forth the computation of our basic and diluted net income (loss) per share attributable to ordinary shareholders and a reconciliation of the numerator and denominator used in the calculation: Year Ended December 28, 2018 December 29, 2017 December 30, 2016 Numerator: Net income from continuing operations $ 57,883 $ 56,915 $ 20,779 Undistributed earnings attributed to preferred shareholders — — (19,060 ) Net income from continuing operations, attributable to ordinary shareholders $ 57,883 $ 56,915 $ 1,719 Net loss from discontinued operations $ — $ (461 ) $ (4,117 ) Undistributed earnings attributed to preferred shareholders — — — Net loss from discontinued operations, attributable to ordinary shareholders $ — $ (461 ) $ (4,117 ) Net income $ 57,883 $ 56,454 $ 16,662 Undistributed earnings attributed to preferred shareholders — — (15,284 ) Net income, attributable to ordinary shareholders $ 57,883 $ 56,454 $ 1,378 Denominator: Weighted average ordinary shares outstanding 24,706,542 25,118,031 1,503,296 Dilutive effect of stock options 398,590 1,030,793 306,871 Dilutive effect of restricted shares 20,530 68,184 157,759 Dilutive effect of employee share purchase plan 2,393 1,416 — Weighted average number of shares used in diluted per share calculation for net income and net income from continuing operations 25,128,055 26,218,424 1,967,926 Weighted average ordinary shares outstanding 24,706,542 25,118,031 1,503,296 Dilutive effect of stock options — — — Dilutive effect of restricted shares — — — Dilutive effect of employee share purchase plan — — — Weighted average number of shares used in diluted per share calculation for net loss from discontinued operations 24,706,542 25,118,031 1,503,296 Earnings per share attributable to ordinary shareholders: Net income from continuing operations: Basic $ 2.34 $ 2.27 $ 1.14 Diluted $ 2.30 $ 2.17 $ 0.87 Net loss from discontinued operations: Basic $ — $ (0.02 ) $ (2.74 ) Diluted $ — $ (0.02 ) $ (2.74 ) Net income: Basic $ 2.34 $ 2.25 $ 0.92 Diluted $ 2.30 $ 2.15 $ 0.70

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 28, 2018
Discontinued Operations And Disposal Groups [Abstract]
Schedule of Carrying Amounts of Major Classes of Assets and Liabilities of Discontinued Operation and Results of Discontinued Operation	The carrying amounts of the major classes of assets and liabilities of our Kingston, New York facility are reflected in the following table: December 29, 2017 Assets Current assets: Prepaid expenses and other current assets $ 3 Total current assets 3 Total assets $ 3 Liabilities Current liabilities: Accounts payable $ 136 Accrued liabilities 255 Other current liabilities 9 Total current liabilities 400 Total liabilities $ 400 The results of the discontinued operation were as follows: Year Ended December 29, 2017 December 30, 2016 Net sales $ — $ 26,576 Cost of sales — 28,077 Operating expenses: Research and development — 262 Selling, general, and administrative 722 2,315 Total operating expenses 722 2,577 Operating loss (722 ) (4,078 ) Other income, net — (1 ) Loss from discontinued operations before income taxes (722 ) (4,077 ) Income tax expense (benefit) (261 ) 40 Loss from discontinued operations $ (461 ) $ (4,117 )

Organization and Summary of S_4

Organization and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands	Dec. 14, 2016USD ($)$ / sharesshares	Jan. 31, 2017USD ($)shares	Dec. 28, 2018USD ($)Customer	Dec. 29, 2017USD ($)Customershares	Dec. 30, 2016USD ($)shares	Aug. 11, 2015USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Issuance of ordinary shares, net of fees				$ 7,278	$ 47,103
Cash held in foreign-based commercial banks			$ 43,834	68,794
Impairment of long-lived assets			0	0
Special bonus to members of management, amount instituted			$ 0	0		$ 3,100
Special bonus members of management, amount expensed					600
Percentage threshold of likelihood of tax positions being realized upon settlement with taxing authority			50.00%
Foreign operations sales			$ 823,611	655,892	405,747
Foreign operations assets			485,489	557,684
Foreign
Organization And Summary Of Significant Accounting Policies [Line Items]
Cash held in foreign-based commercial banks			25,500	36,400
Losses incurred exceeding the insured limits			0	0
Foreign operations sales			$ 379,100	346,000	241,700
Foreign operations assets				$ 157,000	$ 127,200
Accounts Receivable | Customer Concentration Risk
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, Percentage			40.00%	61.00%
Number of customers | Customer			2	2
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Extended product warranty period			1 year
Payment terms, due period			15 days
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Extended product warranty period			2 years
Payment terms, due period			60 days
ASU 2018-11 | Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Operating lease, lease liabilities			$ 17,000
Operating lease, ROU assets			17,000
ASU 2018-11 | Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Operating lease, lease liabilities			22,000
Operating lease, ROU assets			$ 22,000
Ordinary Shares
Organization And Summary Of Significant Accounting Policies [Line Items]
Ordinary shares issued to public | shares				881,667	5,877,778
IPO
Organization And Summary Of Significant Accounting Policies [Line Items]
Ordinary shares issued to public | shares	5,877,778
Ordinary shares issued to public, per share | $ / shares	$ 9
Net proceeds from ordinary shares issued to public	$ 47,100
Loans outstanding amount repaid	$ 40,000
Over-Allotment Option
Organization And Summary Of Significant Accounting Policies [Line Items]
Issuance of ordinary shares, net of fees		$ 7,300
Over-Allotment Option | Ordinary Shares
Organization And Summary Of Significant Accounting Policies [Line Items]
Ordinary shares issued to public | shares		881,667

Organization and Summary of S_5

Organization and Summary of Significant Accounting Policies - Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Allowance For Doubtful Accounts Receivable Rollforward
Beginning Balance	$ 256	$ 194	$ 123
Charges to costs and expenses	195	62	71
Write-offs and recoveries	(111)
Ending Balance	$ 340	$ 256	$ 194

Organization and Summary of S_6

Organization and Summary of Significant Accounting Policies - Property Plant And Equipment Estimated Useful Lives (Details)	12 Months Ended
	Dec. 28, 2018
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	Lesser of 10 years or lease term
Vehicles
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	5 years
Minimum | Machinery
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	5 years
Minimum | Office Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	5 years
Maximum | Machinery
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	10 years
Maximum | Office Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	7 years
Computer Software, Hardware and Equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	3 years
Computer Software, Hardware and Equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives of PP&E	5 years

Organization and Summary of S_7

Organization and Summary of Significant Accounting Policies - Schedule of Finite Lived Intangible Assets Useful Lives (Details)	12 Months Ended
	Dec. 28, 2018
Trademarks
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles	10 years
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles	6 years
Customer Relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles	10 years
Developed Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles	7 years
Developed Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles	10 years

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 11, 2018	Jun. 29, 2018	Apr. 19, 2018	Dec. 11, 2017	Jul. 27, 2017	Apr. 12, 2017	Apr. 12, 2016	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Business Acquisition [Line Items]
Cost of sales									$ 687,474	$ 555,131	$ 340,352
IAN Engineering Co., Ltd.
Business Acquisition [Line Items]
Acquisition amount	$ 6,543			$ 6,500
Cash paid for acquisition				5,300
Contingent consideration with fair value				1,300
Gain on derecognized earn out liability recognized in operating income									1,300
Allocated intangible assets	$ 1,559								1,559
Net sales attributable to acquiree included in statement of operations									7,700
IAN Engineering Co., Ltd. | Customer Relationships
Business Acquisition [Line Items]
Allocated intangible assets				$ 1,600
Weighted average amortization period				6 years
Talon
Business Acquisition [Line Items]
Acquisition amount		$ 137,795			$ 137,800
Allocated intangible assets		$ 35,300
Business acquisition, transaction costs										1,500
Talon | Inventory Fair Value Adjustment
Business Acquisition [Line Items]
Cost of sales									$ 4,500	1,600
Talon | Customer Relationships
Business Acquisition [Line Items]
Allocated intangible assets					$ 32,400
Weighted average amortization period					6 years
Talon | Intellectual Property
Business Acquisition [Line Items]
Allocated intangible assets					$ 2,900
Weighted average amortization period					10 years
Cal Weld, Inc.
Business Acquisition [Line Items]
Acquisition amount			$ 56,186			$ 56,200
Allocated intangible assets			$ 12,140
Net sales attributable to acquiree included in statement of operations										53,000
Business acquisition, transaction costs										1,900
Net income attributable to acquiree included in statement of operations										6,700
Cal Weld, Inc. | Inventory Fair Value Adjustment
Business Acquisition [Line Items]
Cost of sales										$ 3,600
Cal Weld, Inc. | Customer Relationships
Business Acquisition [Line Items]
Allocated intangible assets						$ 11,500
Weighted average amortization period						6 years
Cal Weld, Inc. | Backlog
Business Acquisition [Line Items]
Allocated intangible assets						$ 700
Weighted average amortization period						6 months
Ajax-United Patterns & Molds, Inc
Business Acquisition [Line Items]
Acquisition amount							$ 17,594	$ 17,600
Allocated intangible assets							$ 8,030
Net sales attributable to acquiree included in statement of operations											20,000
Business acquisition, transaction costs											1,500
Net income attributable to acquiree included in statement of operations											$ 600
Ajax-United Patterns & Molds, Inc | Customer Relationships
Business Acquisition [Line Items]
Allocated intangible assets								$ 8,000
Weighted average amortization period								10 years

Acquisitions - Schedule of Meas

Acquisitions - Schedule of Measurement Period Adjustments Related to Finalization of Valuation of Deferred Tax Liabilities and Net Identifiable Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 11, 2018	Jun. 29, 2018	Apr. 19, 2018	Dec. 11, 2017	Jul. 27, 2017	Apr. 12, 2017	Apr. 12, 2016	Apr. 12, 2017	Dec. 29, 2017	Jun. 29, 2018	Dec. 28, 2018	Dec. 30, 2016	Dec. 11, 2018	Dec. 25, 2015
Business Acquisition [Line Items]
Goodwill	$ 173,010									$ 169,399		$ 173,010	$ 77,093		$ 70,015
IAN Engineering Co., Ltd.
Business Acquisition [Line Items]
Cash acquired	3,952
Accounts receivable	863											863
Inventories	1,870											1,870
Prepaid expenses and other current assets	56											56
Property and equipment	396											396
Other noncurrent assets	101											101
Intangible assets	1,559											1,559
Goodwill	2,862											2,862
Accounts payable	(4,193)											(4,193)
Accrued and other current liabilities	(452)											(452)
Deferred tax liabilities	(389)											(389)
Other non-current liabilities	(82)											(82)
Total acquisition consideration	$ 6,543			$ 6,500
IAN Engineering Co., Ltd. | Preliminary Allocation
Business Acquisition [Line Items]
Cash acquired				3,952
Accounts receivable				863
Inventories				1,870
Prepaid expenses and other current assets				56
Property and equipment				396
Other noncurrent assets				101
Intangible assets				1,559
Goodwill				2,856
Accounts payable				(4,193)
Accrued and other current liabilities				(452)
Deferred tax liabilities				(383)
Other non-current liabilities				(82)
Total acquisition consideration				$ 6,543
IAN Engineering Co., Ltd. | Measurement Period Adjustment
Business Acquisition [Line Items]
Goodwill												6
Deferred tax liabilities												$ (6)
Talon
Business Acquisition [Line Items]
Cash acquired		$ 5,586
Accounts receivable		12,071												$ 12,071
Inventories		19,608												19,608
Prepaid expenses and other current assets		182												182
Property and equipment		16,655												16,655
Other noncurrent assets		76												76
Intangible assets		35,300												35,300
Goodwill		75,486												75,486
Accounts payable		(4,706)												(4,706)
Accrued liabilities		(2,597)												(2,597)
Other current liabilities		(866)												(866)
Deferred tax liabilities		(19,000)												(19,000)
Total acquisition consideration		$ 137,795			$ 137,800
Talon | Preliminary Allocation
Business Acquisition [Line Items]
Cash acquired					5,586
Accounts receivable					11,471
Inventories					19,399
Prepaid expenses and other current assets					182
Property and equipment					16,655
Other noncurrent assets					76
Intangible assets					38,000
Goodwill					74,594
Accounts payable					(4,706)
Accrued liabilities					(2,767)
Other current liabilities					(1,838)
Deferred tax liabilities					(19,652)
Total acquisition consideration					$ 137,000
Talon | Measurement Period Adjustment
Business Acquisition [Line Items]
Accounts receivable														600
Inventories														209
Intangible assets														(2,700)
Goodwill														892
Accrued liabilities														170
Other current liabilities														972
Deferred tax liabilities														652
Total acquisition consideration														$ 795
Cal Weld, Inc.
Business Acquisition [Line Items]
Cash acquired			$ 7,337
Accounts receivable			10,318								$ 10,318
Inventories			20,448								20,448
Prepaid expenses and other current assets			400								400
Property and equipment			1,639								1,639
Other noncurrent assets			587								587
Intangible assets			12,140								12,140
Goodwill			17,591								17,591
Accounts payable			(5,991)								(5,991)
Accrued liabilities			(2,110)								(2,110)
Deferred tax liabilities			(5,265)								(5,265)
Other non-current liabilities			(908)								(908)
Total acquisition consideration			$ 56,186			$ 56,200
Cal Weld, Inc. | Preliminary Allocation
Business Acquisition [Line Items]
Cash acquired						7,337
Accounts receivable						10,318
Inventories						20,836
Prepaid expenses and other current assets						287
Property and equipment						1,639
Other noncurrent assets						587
Intangible assets						12,140
Goodwill						17,957
Accounts payable						(5,991)
Accrued liabilities						(2,016)
Deferred tax liabilities						(5,307)
Other non-current liabilities						(908)
Total acquisition consideration						$ 56,879
Cal Weld, Inc. | Measurement Period Adjustment
Business Acquisition [Line Items]
Inventories											(388)
Prepaid expenses and other current assets										113
Goodwill										(223)	(143)
Accrued liabilities										79	(173)
Deferred tax liabilities										$ 31	11
Total acquisition consideration											$ (693)
Ajax-United Patterns & Molds, Inc
Business Acquisition [Line Items]
Cash acquired							$ 187
Accounts receivable							1,250		$ 1,250
Inventories							3,236		3,236
Prepaid expenses and other current assets							85		85
Property and equipment							1,467		1,467
Other noncurrent assets							2,948		2,948
Intangible assets							8,030		8,030
Goodwill							7,056		7,056
Accounts payable							(4,477)		(4,477)
Deferred tax liabilities							(2,188)		(2,188)
Total acquisition consideration							$ 17,594	$ 17,600
Ajax-United Patterns & Molds, Inc | Preliminary Allocation
Business Acquisition [Line Items]
Cash acquired								187
Accounts receivable								1,245
Inventories								3,236
Prepaid expenses and other current assets								77
Property and equipment								1,545
Other noncurrent assets								2,948
Intangible assets								8,130
Goodwill								4,629
Accounts payable								(4,403)
Total acquisition consideration								$ 17,594
Ajax-United Patterns & Molds, Inc | Measurement Period Adjustment
Business Acquisition [Line Items]
Accounts receivable													5
Prepaid expenses and other current assets									8
Property and equipment									(78)
Intangible assets													(100)
Goodwill									(22)				2,449
Deferred tax liabilities									83				(2,271)
Accounts payable and accrued liabilities									$ 9				$ (83)

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 90,713	$ 91,109
Work in process	20,852	42,186
Finished goods	17,233	27,268
Excess and obsolete adjustment	(7,692)	(6,022)
Total inventories, net	$ 121,106	$ 154,541

Inventories - Changes to Compan

Inventories - Changes to Company's excess and obsolete adjustment (Detail) - Excess and obsolete adjustment - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Inventory [Line Items]
Beginning Balance	$ (6,022)	$ (8,080)	$ (6,132)
Charge to cost of sales	(1,871)	(909)	(3,921)
Disposition of inventory	201	2,967	1,973
Ending Balance	$ (7,692)	$ (6,022)	$ (8,080)

Property and Equipment - Summar

Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 60,700	$ 47,034
Less accumulated depreciation	(18,960)	(12,654)
Total property and equipment, net	41,740	34,380
Machinery
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	29,885	23,464
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	15,333	15,329
Office Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,058	868
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	26	51
Construction-In-Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	9,514	2,771
Computer Software, Hardware and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 4,884	$ 4,551

Property and Equipment - Additi

Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Property Plant And Equipment [Abstract]
Depreciation expense	$ 7.7	$ 3.6	$ 2.5

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Schedule of Definite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Finite Lived Intangible Assets [Line Items]
Gross value	$ 95,576	$ 114,767
Accumulated amortization	(38,681)	(41,362)
Carrying amount	56,895	73,405
Trademarks
Finite Lived Intangible Assets [Line Items]
Gross value	9,690	9,690
Accumulated amortization	(6,781)	(5,814)
Carrying amount	$ 2,909	$ 3,876
Weighted average useful life	10 years
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	10 years	10 years
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross value	$ 82,986	$ 81,427
Accumulated amortization	(31,308)	(20,060)
Carrying amount	$ 51,678	$ 61,367
Customer Relationships | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	7 years 9 months 18 days	7 years 9 months 18 days
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	6 years
Customer Relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	10 years
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross value	$ 2,900	$ 22,990
Accumulated amortization	(592)	(14,938)
Carrying amount	$ 2,308	$ 8,052
Developed Technology | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	10 years	7 years 8 months 12 days
Developed Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	7 years
Developed Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	10 years
Backlog
Finite Lived Intangible Assets [Line Items]
Gross value		$ 660
Accumulated amortization		(550)
Carrying amount		$ 110
Backlog | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average useful life		6 months

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,019	$ 12,579
2,020	12,579
2,021	12,579
2,022	8,765
2,023	7,541
Thereafter	2,852
Carrying amount	$ 56,895	$ 73,405

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Schedule of Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Goodwill [Roll Forward]
Goodwill balance	$ 169,399	$ 77,093	$ 70,015
Acquisitions	3,611	92,306	7,078
Goodwill balance	$ 173,010	$ 169,399	$ 77,093

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Rent expense	$ 5.5	$ 3.6	$ 2.9
Non-cancellable operating lease expiration year	2,024

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Future minimum lease payments for non-cancelable operating leases (Detail) $ in Thousands	Dec. 28, 2018USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2,019	$ 4,910
2,020	4,873
2,021	4,356
2,022	3,820
2,023	1,103
Thereafter	120
Total operating lease obligation	$ 19,182

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 29, 2018	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Income Taxes [Line Items]
Corporate income tax rate		21.00%	35.00%
Increase in income tax benefit			$ 5,900
Decrease in net deferred tax liabilities			5,900
Transition tax recognized provisional income tax expense		$ 600	700
Deferred tax assets, tax benefit		(100)
Foreign tax credits carryforward, resulting in discrete benefit		4,100
Operating Loss Carryforwards, federal		1,000
Operating Loss Carryforwards, state		5,800
Foreign tax credits		1,500
Additional benefit resulting from associated valuation allowance	$ 4,100
Tax holiday		7,583	7,437	$ 5,714
Unrecognized tax benefits for uncertain tax positions		2,256	1,910	576	$ 558
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		1,600
Net increase of interest and penalties associated with unrecognized tax benefits		100
Unrecognized tax benefits, income tax penalties		400
Unrecognized tax benefits, interest on income taxes expense		100
Long-term Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits for uncertain tax positions		2,300
Deferred Tax Liabilities Non Current
Income Taxes [Line Items]
Unrecognized tax benefits for uncertain tax positions		0
Singapore
Income Taxes [Line Items]
Tax holiday		7,600	$ 7,400	$ 5,700
GILTI
Income Taxes [Line Items]
Income tax expense (benefit)		100
FDII
Income Taxes [Line Items]
Income tax expense (benefit)		(200)
Federal
Income Taxes [Line Items]
Tax Credit Carryforward amount		1,700
State
Income Taxes [Line Items]
Tax Credit Carryforward amount		$ 400

Income Taxes - Summary of Infor

Income Taxes - Summary of Information on Company's Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
United States	$ 7,519	$ 370	$ (12,553)
Foreign	46,700	42,659	32,683
Income from continuing operations before income taxes	$ 54,219	$ 43,029	$ 20,130

Income Taxes - Significant Comp

Income Taxes - Significant Components of Income Tax Benefit From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Current:
Federal	$ 861	$ 809
State	316	249	$ (73)
Foreign	1,751	397	1,858
Total current tax expense	2,928	1,455	1,785
Deferred:
Federal	(5,379)	(13,251)	(2,213)
State	(667)	(1,553)
Foreign	(546)	(537)	(221)
Total deferred tax benefit	(6,592)	(15,341)	(2,434)
Income tax benefit from continuing operations	$ (3,664)	$ (13,886)	$ (649)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Income Tax at Federal Statutory Tax Rates to Income Tax Benefit From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Effective rate reconciliation:
U.S. federal tax expense	$ 11,386	$ 15,060	$ 7,046
State income taxes, net	(329)	(373)	(324)
Permanent items	30	2,141	303
Foreign rate differential	(1,679)	(7,498)	(5,907)
Tax holiday	(7,583)	(7,437)	(5,714)
Credits	(1,158)	(1,818)	(794)
Tax contingencies	168	335	86
Share-based compensation	(1,270)	(5,438)	185
Withholding tax	727	840	1,435
Impact of re-characterizing intercompany debt to equity		1,409
Impact of Tax Cuts and Jobs Act	199	(6,188)
Other, net	(15)	(248)	168
Valuation allowance	(4,140)	(4,671)	2,867
Income tax benefit from continuing operations	$ (3,664)	$ (13,886)	$ (649)

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Deferred tax assets:
Inventory	$ 3,500	$ 2,825
Share-based compensation	1,295	866
Accrued payroll	896	1,202
Net operating loss carryforwards	534	4,020
Transaction costs	99	63
Tax credits	7,258	5,851
Other assets	1,747	1,956
Deferred tax assets	15,329	16,783
Valuation allowance	(112)	(4,252)
Total deferred tax assets	15,217	12,531
Deferred tax liabilities:
Intangible assets	(13,789)	(18,283)
Property, plant and equipment	(3,687)	(3,069)
Other liabilities	(344)	(743)
Total deferred tax liabilities	(17,820)	(22,095)
Net deferred tax liability	$ (2,603)	$ (9,564)

Income Taxes - Summary of the A

Income Taxes - Summary of the Activity Related to Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward
Beginning balance	$ 1,910	$ 576	$ 558
Increase in tax positions for current year	407	458	118
Increase in tax positions for prior period		214
Increase in tax positions due to acquisitions		710
Decrease in tax positions for prior period	(61)		(100)
Impact of Tax Cuts and Jobs Act		(48)
Ending balance	$ 2,256	$ 1,910	$ 576

Employee Benefit Programs - Add

Employee Benefit Programs - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Defined Contribution Plan Disclosure [Line Items]
Percentage of maximum annual contributions per employee	50.00%	50.00%	50.00%
Percentage of eligible employee receive discretionary matching contribution	50.00%	50.00%	50.00%
Employee matching contributions	$ 1.5	$ 0.7	$ 0.3
Maximum
Defined Contribution Plan Disclosure [Line Items]
Percentage of maximum annual contributions per employee	4.00%

Credit Facilities - Schedule of

Credit Facilities - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 204,787	$ 189,535
Less unamortized debt issuance costs	(3,920)	(2,798)
Total long-term debt, net	200,867	186,737
Less current portion	(8,750)	(6,490)
Total long-term debt, less current portion, net	192,117	180,247
Term Loan
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	170,625	179,535
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 34,162	$ 10,000

Credit Facilities - Maturities

Credit Facilities - Maturities of long Term Debt Consist (Detail) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017
Debt Disclosure [Abstract]
2,019	$ 8,750
2,020	8,750
2,021	8,750
2,022	8,750
2,023	169,787
Total long-term debt	$ 204,787	$ 189,535

Credit Facilities - Additional

Credit Facilities - Additional Information (Details)	Feb. 15, 2018USD ($)	Jul. 31, 2017USD ($)	Apr. 30, 2016USD ($)	Dec. 28, 2018USD ($)	Dec. 29, 2017USD ($)	Dec. 30, 2016	Aug. 11, 2015USD ($)
Line Of Credit Facility [Line Items]
Weighted average interest rate across all credit facilities				4.36%	4.30%	5.04%
Debt issuance costs							$ 2,600,000
Total principal amount of long-term debt				$ 204,787,000	$ 189,535,000
Credit Agreement
Line Of Credit Facility [Line Items]
Debt issuance costs	$ 2,100,000
Fixed charge coverage ratio				1.25%
Description of interest rate				The Base Rate is equal to the higher of i) the Prime Rate, ii) the Federal Funds Rate plus 0.5%, or iii) the Eurodollar Rate plus 1.00%. The Eurodollar rate is equal to LIBOR. The applicable margin on Base Rate and Eurodollar Rate loans is 0.751.50% and 1.752.50% per annum, respectively, depending on our leverage ratio.
Credit Agreement | Federal Funds Effective Rate
Line Of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Credit Agreement | Eurodollar Rate
Line Of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Frequency of interest payment				Last day of the applicable interest period
Credit Agreement | Base Rate
Line Of Credit Facility [Line Items]
Frequency of interest payment				Quarterly
Credit Agreement | Maximum
Line Of Credit Facility [Line Items]
Consolidated leverage ratio				3
Credit Agreement | Maximum | Eurodollar Rate
Line Of Credit Facility [Line Items]
Additional basis spread on variable rate	2.50%
Credit Agreement | Maximum | Base Rate
Line Of Credit Facility [Line Items]
Additional basis spread on variable rate	1.50%
Credit Agreement | Minimum | Eurodollar Rate
Line Of Credit Facility [Line Items]
Additional basis spread on variable rate	1.75%
Credit Agreement | Minimum | Base Rate
Line Of Credit Facility [Line Items]
Additional basis spread on variable rate	0.75%
Term Loan
Line Of Credit Facility [Line Items]
Credit facility, face amount							55,000,000
Total principal amount of long-term debt				$ 170,625,000	179,535,000
Term Loan | Credit Agreement
Line Of Credit Facility [Line Items]
Credit facility, increase amount		$ 20,000,000	$ 15,000,000
Increased term loan facility					120,000,000
Total principal amount of long-term debt	$ 175,000,000
Credit facility, periodic principal payments				$ 2,200,000
Principal payments maturity date				Feb. 15, 2023
Credit facility, frequency of principal payments				quarterly basis
Term Loan | Credit Agreement | Eurodollar Rate
Line Of Credit Facility [Line Items]
Interest rate				4.34%
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Credit facility, face amount							$ 20,000,000
Total principal amount of long-term debt				$ 34,162,000	$ 10,000,000
Revolving Credit Facility | Credit Agreement
Line Of Credit Facility [Line Items]
Credit facility, additional borrowing capacity		$ 20,000
Total principal amount of long-term debt	$ 125,000,000
Principal payments maturity date				Feb. 15, 2023
Revolving Credit Facility | Credit Agreement | Eurodollar Rate
Line Of Credit Facility [Line Items]
Interest rate				4.54%
Revolving Credit Facility | Credit Agreement | Maximum
Line Of Credit Facility [Line Items]
Percentage of commitment fee on unused portion of revolver	0.35%
Revolving Credit Facility | Credit Agreement | Minimum
Line Of Credit Facility [Line Items]
Percentage of commitment fee on unused portion of revolver	0.20%

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	Aug. 18, 2018	Dec. 14, 2016	Aug. 31, 2018	Dec. 30, 2016	Feb. 28, 2018
Shareholders Equity [Line Items]
Share repurchase program, authorized amount					$ 50
Increase in stock repurchase program authorized amount	$ 50		$ 50
Ordinary Shares
Shareholders Equity [Line Items]
Conversion of preferred shares to ordinary shares		17,722,808		17,722,808
Preferred Shares
Shareholders Equity [Line Items]
Conversion of preferred shares to ordinary shares		(17,722,808)		(17,722,808)

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 28, 2018	Aug. 18, 2018	Feb. 15, 2018
Equity [Abstract]
Total Number of Shares Repurchased	1,657,565	1,424,359	1,061,855	195,750	4,339,529
Total Cost of Repurchase	$ 29,662	$ 30,348	$ 24,970	$ 5,000	$ 89,980
Average Price Paid per Share	$ 17.89	$ 21.31	$ 23.52	$ 25.54	$ 20.73
Amount Available Under Repurchase Program	$ 10,021	$ 39,683	$ 20,030	$ 45,000	$ 10,021	$ 70,030	$ 50,000

Shareholders' Equity - Summar_2

Shareholders' Equity - Summary of Share Repurchases (Parenthetical) (Details) - USD ($) $ in Millions	Aug. 18, 2018	Aug. 31, 2018
Equity [Abstract]
Increase in stock repurchase program authorized amount	$ 50	$ 50

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Ajax Foresight Global Manufacturing Sdn. Bhd. (AFGM)
Related Party Transaction [Line Items]
Total purchases		$ 0.2	$ 0.7
Francisco Partners Management, L.P.
Related Party Transaction [Line Items]
Annual advisory fees per year	$ 1.5
Francisco Partners Consulting, LLC
Related Party Transaction [Line Items]
Refund of previously paid consulting fees		$ (0.3)
Payment made for consulting services			0.5
Precision Flow Inc
Related Party Transaction [Line Items]
Rent expense			1
Ceres
Related Party Transaction [Line Items]
Total purchases			0.1
Outstanding sales			$ 0.2

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details) - USD ($)	Jan. 18, 2018	Oct. 25, 2013	May 31, 2017	Mar. 31, 2012	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation					$ 7,577,000	$ 2,230,000	$ 3,216,000
Total unrecognized share-based compensation expense relating to restricted shares					$ 9,700,000
Weighted average remaining service period					2 years 10 months 24 days
Share-based compensation expense					$ 7,300,000	2,200,000	$ 3,200,000
Accounting Standards Update 2016-09
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 2,900,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options vested	88,445
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted shares vested	39,175
Total unrecognized share-based compensation expense relating to restricted shares					$ 3,600,000
Weighted average remaining service period					2 years 9 months 18 days
The 2016 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares reserved for issuance							1,888,000
Percentage of outstanding ordinary shares							2.00%
Share-based compensation arrangement by share-based payment award, expiration period							7 years
Awards vesting percentage							25.00%
Award vesting description							Vesting generally occurs 25% on the first anniversary of the date of grant, and quarterly thereafter over the remaining 3 years.
Awards vesting period							3 years
The 2012 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period				7 years
Awards vesting percentage				25.00%
Award vesting description				Vesting generally occurs 25% on the first anniversary of the date of grant, and quarterly thereafter over the remaining 3 years.
Awards vesting period				3 years
Authorized issuance of stock options or restricted shares				21,000,000
Excess authorized issuance of stock options or restricted shares		4,000,000
Issuances of equity based awards					0
2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized share-based compensation expense relating to restricted shares					$ 0
Share-based compensation expense					$ 300,000	$ 100,000
Purchase price equal to percentage of fair market value of ordinary shares			85.00%

Share-Based Compensation - Sche

Share-Based Compensation - Schedule of Stock Options Valuation Assumptions (Details) - Stock Options	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Weighted average expected term	5 years	5 years	5 years
Risk-free interest rate	2.60%	1.90%	1.30%
Dividend yield	0.00%	0.00%	0.00%
Volatility	52.60%	47.70%	50.00%

Share-Based Compensation - Sc_2

Share-Based Compensation - Schedule of Stock Option Activity (Details) - Stock Options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2018USD ($)$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average exercise price per share, Outstanding, Beginning Balance | $ / shares	$ 12.87
Weighted average exercise price per share, Granted | $ / shares	24.64
Weighted average exercise price per share, Exercised | $ / shares	9.88
Weighted average exercise price per share, Forfeited | $ / shares	20.13
Weighted average exercise price per share, Expired | $ / shares	0
Weighted average exercise price per share, Outstanding, Ending Balance | $ / shares	18.57
Weighted average exercise price per share, Exercisable | $ / shares	$ 12.05
Weighted average remaining contractual term, Outstanding	4 years 8 months 12 days
Weighted average remaining contractual term, Exercisable	2 years 8 months 12 days
Aggregate intrinsic value, Outstanding | $	$ 3,572
Aggregate intrinsic value, Exercisable | $	$ 3,186
Time Vesting
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Stock Options, Outstanding, Beginning Balance	1,452,825
Number of Stock Options, Granted	773,100
Number of Stock Options, Exercised	(423,162)
Number of Stock Options, Forfeited	(96,322)
Number of Stock Options, Expired	0
Number of Stock Options, Outstanding, Ending Balance	1,706,441
Number of Stock Options, Exercisable	594,335
Performance Vesting
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Stock Options, Outstanding, Beginning Balance	215,908
Number of Stock Options, Exercised	(150,000)
Number of Stock Options, Expired	0
Number of Stock Options, Outstanding, Ending Balance	65,908
Number of Stock Options, Exercisable	65,908

Share Based Compensation - Sche

Share Based Compensation - Schedule of Fair Value Information for Options Granted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]
Weighted average grant-date fair value of options granted	$ 11.81	$ 8.52	$ 4.18
Total intrinsic value of options exercised	$ 8,744	$ 16,423

Share-Based Compensation - Sc_3

Share-Based Compensation - Schedule of Restricted Share Activity (Details)	12 Months Ended
	Dec. 28, 2018$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value, Unvested, Beginning Balance | $ / shares	$ 17.53
Weighted average grant date fair value, Granted | $ / shares	23.89
Weighted average grant date fair value, Vested | $ / shares	15.12
Weighted average grant date fair value, Forfeited | $ / shares	0
Weighted average grant date fair value, Unvested, Ending Balance | $ / shares	$ 22.64
Time Vesting Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Restricted Shares, Unvested, Beginning Balance | shares	153,281
Number of Restricted Shares, Granted | shares	122,698
Number of Restricted Shares, Vested | shares	(83,679)
Number of Restricted Shares, Forfeited | shares	0
Number of Restricted Shares, Unvested, Ending Balance | shares	192,300

Share Based Compensation - Sc_2

Share Based Compensation - Schedule of Fair Value Information for Restricted Share Granted and Vested (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of shares granted	$ 23.89
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of shares granted	$ 23.89	$ 19.63	$ 9.42
Total fair value of shares vested	$ 2,041	$ 634	$ 1,484

Share-Based Compensation - Sc_4

Share-Based Compensation - Schedule of Weighted Average Assumption used to Measure Fair Value (Details) - Stock Options	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Weighted average expected term	5 years	5 years	5 years
Risk-free interest rate	2.60%	1.90%	1.30%
Dividend yield	0.00%	0.00%	0.00%
Volatility	52.60%	47.70%	50.00%
2017 Employee Stock Purchase Plan
Weighted average expected term	6 months	4 months 24 days
Risk-free interest rate	1.90%	1.10%
Dividend yield	0.00%	0.00%
Volatility	52.70%	47.80%

Segment Information - Additiona

Segment Information - Additional Information (Details) - Segment	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Segment Reporting Information [Line Items]
Number of operating segment	1
Two Major Customer | Sales Revenue, Net
Segment Reporting Information [Line Items]
Percentage of net sales from continuing operations from two customers	88.00%	93.00%	97.00%

Segment Information - Schedule

Segment Information - Schedule of Sales By Geographic Area (Including Sales from Discontinued Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Segment Reporting Information [Line Items]
Total net sales	$ 823,611	$ 655,892	$ 432,323
United States of America
Segment Reporting Information [Line Items]
Total net sales	502,750	386,645	243,237
Singapore
Segment Reporting Information [Line Items]
Total net sales	224,230	223,277	163,515
Europe
Segment Reporting Information [Line Items]
Total net sales	60,688	27,555	16,353
Other
Segment Reporting Information [Line Items]
Total net sales	$ 35,943	$ 18,415	$ 9,218

Segment Information - Sales fro

Segment Information - Sales from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 823,611	$ 655,892	$ 405,747
Lam Research
Segment Reporting Information [Line Items]
Net sales	458,705	350,372	207,230
Applied Materials
Segment Reporting Information [Line Items]
Net sales	$ 262,146	$ 259,234	$ 185,465

Earnings per Share - Computatio

Earnings per Share - Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Ordinary Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Earnings Per Share Basic And Diluted [Line Items]
Net income from continuing operations	$ 57,883	$ 56,915	$ 20,779
Undistributed earnings attributed to preferred shareholders			(19,060)
Net income from continuing operations, attributable to ordinary shareholders	57,883	56,915	1,719
Net loss from discontinued operations		(461)	(4,117)
Net loss from discontinued operations, attributable to ordinary shareholders		(461)	(4,117)
Net income	57,883	56,454	16,662
Undistributed earnings attributed to preferred shareholders			(15,284)
Net income attributable to ordinary shareholders	$ 57,883	$ 56,454	$ 1,378
Weighted average ordinary shares outstanding	24,706,542	25,118,031	1,503,296
Weighted average number of shares used in diluted per share calculation for net income and net income from continuing operations	25,128,055	26,218,424	1,967,926
Net income from continuing operations:
Basic	$ 2.34	$ 2.27	$ 1.14
Diluted	2.30	2.17	0.87
Net loss from discontinued operations:
Basic		(0.02)	(2.74)
Diluted		(0.02)	(2.74)
Net income:
Basic	2.34	2.25	0.92
Diluted	$ 2.30	$ 2.15	$ 0.70
Continuing Operations
Earnings Per Share Basic And Diluted [Line Items]
Weighted average ordinary shares outstanding	24,706,542	25,118,031	1,503,296
Weighted average number of shares used in diluted per share calculation for net income and net income from continuing operations	25,128,055	26,218,424	1,967,926
Continuing Operations | Employee Stock Option
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect of shares	398,590	1,030,793	306,871
Continuing Operations | Restricted Stock
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect of shares	20,530	68,184	157,759
Continuing Operations | 2017 Employee Stock Purchase Plan
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect of shares	2,393	1,416
Discontinued Operations
Earnings Per Share Basic And Diluted [Line Items]
Weighted average ordinary shares outstanding	24,706,542	25,118,031	1,503,296
Weighted average number of shares used in diluted per share calculation for net income and net income from continuing operations	24,706,542	25,118,031	1,503,296

Earnings per Share - Additional

Earnings per Share - Additional Information (Details) - shares	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Earnings Per Share [Abstract]
Potential ordinary shares excluded from computation of diluted net income (loss) per share attributable to ordinary shareholders	516,070	72,321	165,275

Discontinued Operations - Addit

Discontinued Operations - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 28, 2018	Dec. 29, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Lease abandonment	$ 600
Inventory charges	$ 2,000
Kingston, New York Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Accruede for remaining costs of lease			$ 255
Lease expiration period		2018-02
Accrued Liabilities [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Accruede for remaining costs of lease			$ 300

Discontinued Operations - Sched

Discontinued Operations - Schedule of Carrying Amounts of Major Classes of Assets and Liabilities (Details) $ in Thousands	Dec. 29, 2017USD ($)
Current assets:
Total current assets	$ 3
Current liabilities:
Total current liabilities	400
Kingston, New York Facility
Current assets:
Prepaid expenses and other current assets	3
Total current assets	3
Total assets	3
Current liabilities:
Accounts payable	136
Accrued liabilities	255
Other current liabilities	9
Total current liabilities	400
Total liabilities	$ 400

Discontinued Operations - Sch_2

Discontinued Operations - Schedule of Results of Discontinued Operation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016
Operating expenses:
Loss from discontinued operations before income taxes	$ (722)	$ (4,077)
Income tax expense (benefit)	(261)	40
Net loss from discontinued operations	(461)	(4,117)
Kingston, New York Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales		26,576
Cost of sales		28,077
Operating expenses:
Research and development		262
Selling, general, and administrative	722	2,315
Total operating expenses	722	2,577
Operating loss	(722)	(4,078)
Other income, net		(1)
Loss from discontinued operations before income taxes	(722)	(4,077)
Income tax expense (benefit)	(261)	40
Net loss from discontinued operations	$ (461)	$ (4,117)

Subsequent Events (unaudited) -

Subsequent Events (unaudited) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended				12 Months Ended
	Jan. 31, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 28, 2018
Subsequent Event [Line Items]
Number of shares repurchased during period		1,657,565	1,424,359	1,061,855	195,750	4,339,529
Total cost of repurchased shares		$ 29,662	$ 30,348	$ 24,970	$ 5,000	$ 89,980
Average price of repurchased shares		$ 17.89	$ 21.31	$ 23.52	$ 25.54	$ 20.73
Subsequent Event
Subsequent Event [Line Items]
Number of shares repurchased during period	97,910
Total cost of repurchased shares	$ 1,600
Average price of repurchased shares	$ 16.34