Ichor (ICHR) 10-K 5 Mar 21 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 25, 2020	Feb. 26, 2021	Jun. 26, 2020
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 25, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Trading Symbol	ICHR
Entity Registrant Name	ICHOR HOLDINGS, LTD.
Entity Central Index Key	0001652535
Current Fiscal Year End Date	--12-25
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Shell Company	false
Entity File Number	001-37961
Entity Tax Identification Number	00-0000000
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Ordinary Shares Outstanding		28,058,970
Entity Public Float			$ 578,920,000
Title of 12(b) Security	Ordinary Shares, par value $0.0001
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	3185 Laurelview Ct.
Entity Address, City or Town	Fremont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94538
City Area Code	510
Local Phone Number	897-5200
ICFR Auditor Attestation Flag	false
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	The information required by Part III of Form 10‑K is incorporated herein by reference to the registrant’s definitive Proxy Statement relating to its 2020 General Meeting, which will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 27, 2019
Current assets:
Cash	$ 252,899	$ 60,612
Accounts receivable, net	100,977	84,849
Inventories	134,756	127,037
Prepaid expenses and other current assets	7,082	4,449
Total current assets	495,714	276,947
Property and equipment, net	41,811	44,541
Operating lease right-of-use assets	10,088	14,198
Other noncurrent assets	5,503	1,094
Deferred tax assets, net	6,324	4,738
Intangible assets, net	39,845	52,027
Goodwill	174,887	173,010
Total assets	774,172	566,555
Current liabilities:
Accounts payable	116,664	131,578
Accrued liabilities	20,792	12,814
Other current liabilities	10,700	5,233
Current portion of long-term debt	8,750	8,750
Current portion of lease liabilities	5,128	5,492
Total current liabilities	162,034	163,867
Long-term debt, less current portion, net	191,522	169,304
Lease liabilities, less current portion	5,272	9,081
Deferred tax liabilities, net	109	210
Other non-current liabilities	3,546	2,677
Total liabilities	362,483	345,139
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; 27,907,077 and 22,618,708 shares outstanding, respectively; 32,344,516 and 27,056,147 shares issued, respectively)	3	2
Additional paid in capital	399,311	242,318
Treasury shares at cost (4,437,439 shares)	(91,578)	(91,578)
Retained earnings	103,953	70,674
Total shareholders’ equity	411,689	221,416
Total liabilities and shareholders’ equity	$ 774,172	$ 566,555

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 25, 2020	Dec. 27, 2019
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	32,344,516	27,056,147
Ordinary shares, outstanding	27,907,077	22,618,708
Treasury shares	4,437,439	4,437,439

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Income Statement [Abstract]
Net sales	$ 914,236	$ 620,837	$ 823,611
Cost of sales	789,344	534,473	687,474
Gross profit	124,892	86,364	136,137
Operating expenses:
Research and development	13,361	11,102	9,355
Selling, general, and administrative	56,614	47,270	47,448
Amortization of intangible assets	13,365	13,015	15,369
Total operating expenses	83,340	71,387	72,172
Operating income	41,552	14,977	63,965
Interest expense	8,727	10,647	9,987
Other expense (income), net	534	55	(241)
Income before income taxes	32,291	4,275	54,219
Income tax benefit	(988)	(6,454)	(3,664)
Net income	$ 33,279	$ 10,729	$ 57,883
Net income per share: Basic	$ 1.44	$ 0.48	$ 2.34
Net income per share: Diluted	$ 1.42	$ 0.47	$ 2.30
Shares used to compute net income per share:
Shares used to compute net income per share, Basic	23,172,961	22,418,802	24,706,542
Shares used to compute net income per share, Diluted	23,460,105	22,766,903	25,128,055

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Ordinary Shares	Additional Paid-in Capital	Treasury Shares	Retained Earnings (Accumulated Deficit)
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
Ordinary shares issued from exercise of stock options	5,042		5,042
Ordinary shares issued from exercise of stock options, shares		353,027
Ordinary shares issued from vesting of restricted share units	(290)		(290)
Ordinary shares issued from vesting of restricted share units, shares		81,438
Ordinary shares issued from employee share purchase plan	671		671
Ordinary shares issued from employee share purchase plan, shares		47,645
Repurchase of ordinary shares	$ (1,599)			$ (1,599)
Repurchase of ordinary shares, shares	(97,910)	(97,910)		97,910
Share-based compensation expense	$ 8,537		8,537
Net income	10,729				10,729
Balance at Dec. 27, 2019	221,416	$ 2	242,318	$ (91,578)	70,674
Balance, Shares at Dec. 27, 2019		22,618,708		4,437,439
Ordinary shares issued, net of transaction costs	139,372	$ 1	139,371
Ordinary shares issued, net of transaction costs, shares		4,600,000
Ordinary shares issued from exercise of stock options	8,849		8,849
Ordinary shares issued from exercise of stock options, shares		514,481
Ordinary shares issued from vesting of restricted share units	(1,829)		(1,829)
Ordinary shares issued from vesting of restricted share units, shares		140,700
Ordinary shares issued from employee share purchase plan	727		727
Ordinary shares issued from employee share purchase plan, shares		33,188
Share-based compensation expense	9,875		9,875
Net income	33,279				33,279
Balance at Dec. 25, 2020	$ 411,689	$ 3	$ 399,311	$ (91,578)	$ 103,953
Balance, Shares at Dec. 25, 2020		27,907,077		4,437,439

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Cash flows from operating activities:
Net income	$ 33,279	$ 10,729	$ 57,883
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,246	21,869	23,064
Share-based compensation	9,875	8,537	7,577
Deferred income taxes	(1,687)	(7,131)	(6,687)
Amortization of debt issuance costs	968	937	970
Loss on sale of asset disposal group	3,575
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	(16,128)	(44,562)	10,425
Inventories	(8,527)	(5,931)	35,126
Prepaid expenses and other assets	(2,076)	6,067	(685)
Accounts payable	(14,509)	67,966	(62,173)
Accrued liabilities	7,722	3,214	(3,518)
Other liabilities	1,521	(4,545)	(1,507)
Net cash provided by operating activities	38,259	57,150	60,475
Cash flows from investing activities:
Capital expenditures	(10,301)	(12,343)	(13,920)
Cash paid for acquisitions, net of cash acquired	(5,035)		(1,443)
Cash paid for intangible assets		(8,147)
Proceeds from sale of property and equipment	739
Net cash used in investing activities	(14,597)	(20,490)	(15,363)
Cash flows from financing activities:
Issuance of ordinary shares, net of fees	139,372
Issuance of ordinary shares under share-based compensation plans	9,832	5,757	6,329
Employees' taxes paid upon vesting of restricted share units	(1,829)	(290)	(91)
Repurchase of ordinary shares		(1,599)	(89,980)
Debt issuance and modification costs			(2,092)
Borrowings on revolving credit facility	30,000	13,000	44,162
Repayments on revolving credit facility		(28,000)	(20,000)
Repayments on term loan	(8,750)	(8,750)	(8,910)
Net cash provided by (used in) financing activities	168,625	(19,882)	(70,582)
Net increase in cash	192,287	16,778	(25,470)
Cash at beginning of period	60,612	43,834	69,304
Cash at end of period	252,899	60,612	43,834
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	8,235	8,424	8,273
Cash paid during the period for taxes, net of refunds	250	896	2,278
Supplemental disclosures of non-cash activities:
Capital expenditures included in accounts payable	369	774	$ 1,462
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 642	$ 817

Organization and Summary of Sig

Organization and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 25, 2020
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	Note 1 – 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, the United Kingdom, Singapore, Malaysia, Korea, and Mexico. 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. Basis of Presentation These consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the U.S. (“GAAP”). All intercompany balances and transactions have been eliminated upon consolidation. All dollar figures presented in tables in the notes to consolidated financial statements are in thousands, except per share amounts. 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 Year End We use a 52‑ or 53‑week fiscal year ending on the last Friday in December. The years ended December 25, 2020, December 27, 2019, and December 28, 2018 were all 52 weeks. All references to 2020, 2019, and 2018 are references to the fiscal years then ended. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of 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, 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 sales. 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 Commitments and Contingencies 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. Concentration of Credit Risk Financial instruments that subject us to credit risk consist of accounts receivable, accounts payable, and long-term debt. At December 25, 2020 and December 27, 2019, two customers represented, in the aggregate, approximately 73% and 66%, 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 29, 2017 $ 256 Charges to costs and expenses 195 Write-offs (111 ) Balance at December 28, 2018 340 Charges to costs and expenses — Write-offs (45 ) Balance at December 27, 2019 295 Charges to costs and expenses 209 Write-offs (126 ) Balance at December 25, 2020 $ 378 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 $39.9 million and $34.4 million at December 25, 2020 and December 27, 2019, respectively, and at times exceeds insured amounts. No losses have been incurred at December 25, 2020 or December 27, 2019 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 2020. We estimate the recorded value of our financial assets and liabilities approximates fair value at December 25, 2020 and December 27, 2019. We estimate the value of acquired 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 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 property & equipment Machinery 5-10 years Leasehold improvements 10 years 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 material value to 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. Leases We determine if an arrangement is a lease, or contains a lease, at the inception of the arrangement. If we determine the arrangement is a lease, or contains a lease, at lease inception, we then determine whether the lease is an operating lease or a finance lease. Operating and finance leases result in recording a right-of-use (“ROU”) asset and lease liability on our consolidated balance sheets. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. For purposes of calculating operating lease ROU assets and operating lease liabilities, we use the non-cancellable lease term plus options to extend that we are reasonably certain to take. Lease expense for operating lease payments is recognized on a straight-line basis over the lease term. 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. During 2020 and 2019, we did not identify any triggering events that would indicate 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 intangible assets 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 25, 2020 and December 27, 2019. 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. Share-Based Payments We use the Black-Scholes option-pricing model to value 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 and stock option exercises. 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 operations located in the United Kingdom, Singapore, Malaysia, and Mexico, 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 expense (income), net on our consolidated statements of operations. Substantially all of our sales contracts, and most of our agreements with third-party suppliers, provide for pricing and payment in U.S. dollars. Accordingly, these transactions are not subject to material exchange rate fluctuations. Accounting Pronouncements Recently Adopted In February 2016, the FASB issued ASU 2016‑02, Leases (Topic 842) , which consists of a comprehensive lease accounting standard. Under the 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. 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 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 adopted and applied the lease standard as of December 29, 2018 , the first day of fiscal year 2019, using this optional transition method. The standard provides a number of practical expedients in transition. We elected the package of practical expedients, which permits us not to reassess our prior conclusions about lease identification, lease classification, and initial direct costs. We elected to not recognize short-term leases, those with an initial term of 12 months or less, on our consolidated balance sheets. The standard had material effects on our consolidated financial statements. The most significant effects relate to the recognition of 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, we recorded operating lease liabilities of $18.1 million, with an offsetting increase to operating lease ROU assets of $17.7 million in exchange for the liabilities assumed. We did not recognize a cumulative-effect adjustment to the opening balance of retained earnings, as there was no adjustment to be made as a result of our adoption and application of the standard. The standard did not have a significant impact on our consolidated statements of operations or cash flows. In June 2016, the FASB issued ASU 2016‑13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . This standard changes the methodology for measuring credit losses on financial instruments and the timing of when such losses are recorded. We adopted the standard on the first day of the first quarter of 2020, and the adoption did not have a significant impact on our financial statements. In August 2018, the FASB issued ASU 2018‑15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350‑40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . The new guidance clarifies the accounting for implementation costs in cloud computing arrangements. We adopted the standard on the first day of the first quarter of 2020. During the 2020, we incurred capitalizable implementation costs of approximately $4.4 million in connection with our implementation of a new company-wide ERP system that is classified as a hosting arrangement that is a service contract. Accordingly, these costs are included in Other noncurrent assets on our consolidated balance sheet as of December 25, 2020. Additionally, our cash used in operating activities for 2020 includes $3.3 million in cash outflows associated with these capitalized implementation costs. As the ERP system was not yet in-service as of December 25, 2020, there was no amortization expense recognized during 2020. Accounting Pronouncements Recently Issued In December 2019, the FASB issued ASU 2019‑12, Income Taxes (Topic 740) – Simplifying the Accounting for Income Taxes , as part of its initiative to reduce complexity in accounting standards. The amendments in the ASU include removing exceptions to incremental intraperiod tax allocation of losses and gains from different financial statement components, exceptions to the method of recognizing income taxes on interim period losses, and exceptions to deferred tax liability recognition related to foreign subsidiary investments. In addition, the ASU requires that entities recognize franchise tax based on an incremental method and requires an entity to evaluate the accounting for step-ups in the tax basis of goodwill as inside or outside of a business combination. The amendments in the ASU are effective for fiscal years beginning after December 15, 2020, including interim periods therein. We have not adopted this ASU as of December 25, 2020. We are currently evaluating the impact the ASU, although we do not expect the ASU to to have a significant impact on our financial statements.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 25, 2020
Business Combinations [Abstract]
Acquisitions	Note 2 – Acquisitions On December 1, 2020, we acquired certain operating assets and assumed the operations of a precision machining operation in Nogales, Mexico, which was considered a business combination under ASC 805 – Business Combinations 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 would become 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 the final allocation as of 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 Final 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 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. 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.

Inventories

Inventories	12 Months Ended
	Dec. 25, 2020
Inventory Disclosure [Abstract]
Inventories	Note 3 – Inventories Inventories consist of the following: December 25, 2020 December 27, 2019 Raw materials $ 88,015 $ 85,329 Work in process 38,184 31,825 Finished goods 21,299 17,700 Excess and obsolete adjustment (12,742 ) (7,817 ) Total inventories $ 134,756 $ 127,037 The following table presents changes to our excess and obsolete adjustment: Excess and obsolete adjustment 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 ) Charge to cost of sales (1,086 ) Disposition of inventory 961 Balance at December 27, 2019 (7,817 ) Charge to cost of sales (4,649 ) Disposition of inventory (276 ) Balance at December 25, 2020 $ (12,742 )

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 25, 2020
Property Plant And Equipment [Abstract]
Property and Equipment	Note 4 – Property and Equipment Property and equipment consist of the following: December 25, 2020 December 27, 2019 Machinery $ 37,196 $ 33,684 Leasehold improvements 29,616 27,835 Computer software, hardware, and equipment 6,501 5,796 Office furniture, fixtures and equipment 1,166 1,040 Vehicles 75 26 Construction-in-process 5,483 3,760 80,037 72,141 Less accumulated depreciation (38,226 ) (27,600 ) Total property and equipment, net $ 41,811 $ 44,541 Depreciation expense for 2020, 2019, and 2018 was $10.9 million, $8.9 million, and $7.7 million, respectively. Cloud Computing Implementation Costs Pursuant to ASU 2018-15, we capitalize implementation costs associated with hosting arrangement that are service contracts. These costs are recorded to prepaid expenses or other noncurrent assets. To-date, these costs are those incurred to implement a new company-wide ERP system. The following table summarizes capitalized cloud computing implementation costs: Capitalized cloud computing implementation costs as of December 27, 2019 $ — Costs capitalized during the period 4,366 Capitalized costs amortized during the period — Capitalized cloud computing implementation costs as of December 25, 2020 $ 4,366

Intangible Assets and Goodwill

Intangible Assets and Goodwill	12 Months Ended
	Dec. 25, 2020
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 25, 2020 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (8,717 ) $ — $ 973 10.0 years Customer relationships 84,169 (53,946 ) — 30,223 7.8 years Developed technology 11,047 (2,398 ) — 8,649 10.0 years Total intangible assets $ 104,906 $ (65,061 ) $ — $ 39,845 December 27, 2019 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (7,750 ) $ — $ 1,940 10.0 years Customer relationships 82,986 (42,621 ) — 40,365 7.8 years Developed technology 11,047 (1,325 ) — 9,722 10.0 years Total intangible assets $ 103,723 $ (51,696 ) $ — $ 52,027 Future projected annual amortization expense consists of the following: Future amortization expense 2021 $ 13,591 2022 9,778 2023 8,552 2024 2,156 2025 2,071 Thereafter 3,697 $ 39,845 The following tables present the changes to goodwill: Goodwill Balance at December 29, 2017 $ 169,399 Acquisitions 3,611 Balance at December 28, 2018 173,010 Acquisitions — Balance at December 27, 2019 173,010 Acquisitions 1,877 Balance at December 25, 2020 $ 174,887

Leases

Leases	12 Months Ended
	Dec. 25, 2020
Leases [Abstract]
Leases	Note 6 – Leases We lease facilities under various non-cancellable operating leases expiring through 2025. In addition to base rental payments, we are generally responsible for our proportionate share of operating expenses, including facility maintenance, insurance, and property taxes. As these amounts are variable, they are not included in lease liabilities. As of December 2 5 , 20 20 , we had no operating leases executed for which the rental period had not yet commenced. The components of lease expense are as follows: Year Ended December 25, 2020 December 27, 2019 Operating lease cost $ 5,397 $ 5,420 Supplemental cash flow information related to leases is as follows: Year Ended December 25, 2020 December 27, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,574 $ 5,220 Supplemental balance sheet information related to leases is as follows: December 25, 2020 December 27, 2019 Weighted-average remaining lease term of operating leases 2.3 years 3.1 years Weighted-average discount rate of operating leases 4.5% 4.5% Future minimum lease payments under non-cancellable leases as of December 25, 2020 are as follows 2021 $ 5,128 2022 4,340 2023 1,283 2024 248 2025 26 Total future minimum lease payments 11,025 Less imputed interest (625 ) Total lease liabilities $ 10,400

Income Taxes

Income Taxes	12 Months Ended
	Dec. 25, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Note 7 – Income Taxes On March 27, 2020 the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was signed into law. The CARES Act allows net operating losses from the 2018, 2019 and 2020 tax years to be carried back up to five years. As a result, during 2020 we were able to carry back our 2019 net operating loss to tax years 2017 and 2018, resulting in a $1.0 million refund claim. The CARES Act also provided for an increased interest deduction for tax years 2019 and 2020, as well as the deferral of the employer portion of social security 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. 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 in 2018 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. During the third quarter of 2020, the IRS issued final regulations that clarified the provision in the 2017 Tax Act that may limit our utilization of certain foreign tax credit carryforwards. For 2020, we have determined that it is more likely than not that the foreign tax credits will be realized within the carryforward period and determined that a valuation allowance is not necessary. Income before tax was as follows: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 United States $ (2,558 ) $ (20,993 ) $ 7,519 Foreign 34,849 25,268 46,700 Income before tax $ 32,291 $ 4,275 $ 54,219 Significant components of income tax benefit consist of the following: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Current: Federal $ (1,103 ) $ (812 ) $ 861 State 341 649 316 Foreign 1,461 868 1,751 Total current tax expense 699 705 2,928 Deferred: Federal (1,321 ) (5,315 ) (5,379 ) State (196 ) (1,218 ) (667 ) Foreign (170 ) (626 ) (546 ) Total deferred tax benefit (1,687 ) (7,159 ) (6,592 ) Income tax benefit $ (988 ) $ (6,454 ) $ (3,664 ) The reconciliation of income tax computed at the U.S. federal statutory tax rates to income tax benefit consist of the following: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Effective rate reconciliation: U.S. federal tax expense $ 6,781 $ 898 $ 11,386 State income taxes, net 105 (523 ) (329 ) Permanent items 298 (75 ) 30 Foreign rate differential (1,325 ) (1,051 ) (1,679 ) Tax holiday (5,911 ) (4,582 ) (7,583 ) Credits (1,411 ) (918 ) (1,158 ) Tax contingencies 80 (830 ) 168 Share-based compensation (1,002 ) (285 ) (1,270 ) Withholding tax 819 554 727 Impact of Tax Cuts and Jobs Act — — 199 Other, net 330 201 (15 ) Valuation allowance 248 157 (4,140 ) Income tax benefit $ (988 ) $ (6,454 ) $ (3,664 ) Deferred income tax assets and liabilities consist of the following. Certain reclassifications have been made to the prior period to conform to the current period presentation. December 25, 2020 December 27, 2019 Deferred tax assets: Inventory $ 3,836 $ 3,620 Share-based compensation 2,266 2,176 Accrued payroll 2,370 906 Net operating loss carryforwards 873 938 Interest carryforwards — 1,382 Tax credits 7,943 7,318 Intercompany interest 1,689 1,500 Operating lease liabilities 2,616 3,877 Other assets 414 211 Deferred tax assets 22,007 21,928 Valuation allowance (518 ) (270 ) Total deferred tax assets 21,489 21,658 Deferred tax liabilities: Intangible assets (7,344 ) (10,482 ) Property, plant and equipment (5,273 ) (2,703 ) Operating lease right-of-use assets (2,568 ) (3,819 ) Other liabilities (89 ) (126 ) Total deferred tax liabilities (15,274 ) (17,130 ) Net deferred tax asset $ 6,215 $ 4,528 At December 25, 2020, we had federal, state, and foreign net operating loss carryforwards of $0.1 million, $5.4 million, and $2.2 million respectively. The federal, state, and foreign net operating loss carryforwards, if not utilized, will begin to expire in 2035, 2032, and 2029, respectively. At December 25, 2020, we had federal and state research and development credits of $2.9 million and $0.1 million, respectively. The federal research and development credits, if not utilized, will begin to expire in 2032, while the state research and development credits will carryforward indefinitely. Additionally, we had foreign tax credits of $2.2 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. As of December 25, 2020, 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. We were granted a tax holiday for our Singapore operations effective 2011 through 2021. We expect to finalize an extension of the tax holiday through 2026 during the first quarter of 2021. The net impact of the tax holiday in Singapore as compared to the Singapore statutory rate was a benefit of $5.9 million, $4.6 million, and $7.6 million during 2020, 2019, and 2018, 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 25, 2020, we have recognized $2.5 million of unrecognized tax benefits in other non-current liabilities in our consolidated balance sheet. If recognized, $1.1 million of this amount would impact our effective tax rate. We expect a decrease of $0.1 million 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 our statements of operations in income tax benefit. Interest and penalties associated with uncertain tax positions recognized during 2020 were insignificant. At December 25, 2020, other non-current liabilities on our balance sheet included approximately zero and $0.4 million of interest and penalties, respectively, associated with uncertain tax positions, which are excluded from the unrecognized tax benefits table below. The following table summarizes the activity related to our unrecognized tax benefits: Unrecognized tax benefits 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 Increase in tax positions for current year 380 Increase in tax positions for prior period 8 Decrease in tax positions for prior period (784 ) Balance at December 27, 2019 1,860 Increase in tax positions for current year 378 Increase in tax positions for prior period 484 Decrease in tax positions for prior period (232 ) Balance at December 25, 2020 $ 2,490 We assert indefinite reinvestment of our U.S. and Netherlands unremitted earnings. With regard to these unremitted earnings, we have not, nor do we anticipate the need to repatriate funds from the U.S. to the Netherlands or from the Netherlands to the Cayman entity to satisfy liquidity needs. Determination of the amount of unrecognized withholding tax liability related to the indefinitely reinvested earnings is not practicable. 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 2017, to state examinations before 2016, or to foreign examinations before 2015. 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. At December 25, 2020, we were not under examination by a tax authority.

Employee Benefit Programs

Employee Benefit Programs	12 Months Ended
	Dec. 25, 2020
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 2020, 2019, and 2018, matching contributions were $1.9 million, $1.5 million, and $1.5 million, respectively.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 25, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Note 9 – Long-Term Debt Long-term debt consists of the following: December 25, 2020 December 27, 2019 Term loan $ 153,125 $ 161,875 Revolving credit facility 49,162 19,162 Total principal amount of long-term debt 202,287 181,037 Less unamortized debt issuance costs (2,015 ) (2,983 ) Total long-term debt, net 200,272 178,054 Less current portion (8,750 ) (8,750 ) Total long-term debt, less current portion, net $ 191,522 $ 169,304 Maturities of long-term debt consist of the following: Future maturities of long-term debt 2021 $ 8,750 2022 8,750 2023 184,787 Total $ 202,287 The weighted average interest rate across all credit facilities was 3.75%, 4.78%, and 4.36% during 2020, 2019, and 2018, respectively. On February 15, 2018, we entered into an amended and restated credit agreement, which includes a $175.0 million term loan and a $125.0 million revolving credit facility. We incurred debt issuance costs of $2.1 million in connection with the amendment. We account debt issuance costs as a reduction to the carrying value of our long-term debt, and we amortize the costs to interest expense over the term of the credit agreement. The amendment did not meet the definition of an extinguishment and was accounted for as a modification. Term loan payments of $2.2 million are due on a quarterly basis. The credit agreement matures on February 15, 2023. 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 revolving credit facility. 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 25, 2020, the term loan and revolver bore interest at the Eurodollar rate option of 3.50% and 2.73%, respectively.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 25, 2020
Equity [Abstract]
Shareholders' Equity	Note 10 – Shareholders’ Equity Public Offering of Shares On December 14, 2020, we completed an underwritten public offering of 4.6 million ordinary shares with net proceeds of $139.4 million, after deducting the underwriting discount of $1.35 per share and incremental offering expenses of $0.5 million. 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 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 Quarter ended March 29, 2019 97,910 1,599 $ 16.33 $ 8,421 Quarter ended June 28, 2019 — — $ — $ 8,421 Quarter ended September 27, 2019 — — $ — $ 8,421 Quarter ended December 27, 2019 — — $ — $ 8,421 Year ended December 27, 2019 97,910 $ 1,599 $ 16.33 $ 8,421

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 25, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation	Note 11 – Share-Based Compensation 2016 Plan In December 2016, we adopted the 2016 Omnibus Incentive Plan (“the 2016 Plan”). The 2016 Plan provides for grants of share‑based awards to employees, directors, and consultants Awards may be in the form of stock options (“options”), tandem and non‑tandem stock appreciation rights, restricted share awards or restricted share units (“RSUs”), performance awards, and other share‑based awards Options granted under the 2016 Plan generally have a term of 7 years. Vesting of options and RSUs generally occurs 25% on the first anniversary of the date of grant and quarterly thereafter over the remaining 3 years. Upon vesting of RSUs, 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 could grant either restricted shares, RSUs, or options to employees, directors, and consultants. Options granted under the 2012 Plan generally had a term of 7 years. Vesting of options and RSUs generally occurred 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. Share‑based compensation expense across all plans for options, RSUs, and employee share purchase rights was $9.9 million, $8.5 million, and $7.6 million during 2020, 2019, and 2018, respectively. On November 12, 2019, in connection with the transition of our former Chief Executive Officer to Executive Chairman, the Compensation Committee of the Board of Directors modified all outstanding equity awards such that the next 18 months of vesting events would be pulled forward and become immediately vested on January 6, 2020. Consequently, 98,825 options and 60,721 RSUs vested on January 6, 2020. This was accounted for as a probable-to-probable modification under ASC Topic 718, resulting in approximately $1.4 million in share-based compensation expense pulled forward into 2019. 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 options and 39,175 RSUs vested on January 18, 2018. This was accounted for as an improbable-to-probable modification under ASC Topic 718, resulting in $2.9 million in share-based compensation expense recognized in 2018. Stock Options The table below sets forth the weighted average assumptions used to measure the fair value of options granted: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Weighted average expected term 5 years 5 years 5 years Risk-free interest rate 0.5% 2.1% 2.6% Dividend yield 0.0% 0.0% 0.0% Volatility 61.5% 55.3% 52.6% The following table summarizes 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 27, 2019 1,688,938 65,908 $ 20.57 Granted 234,420 — $ 23.67 Exercised (514,481 ) — $ 17.20 Forfeited or expired (83,051 ) — $ 22.49 Outstanding, December 25, 2020 1,325,826 65,908 $ 22.22 4.6 years $ 11,554 Exercisable, December 25, 2020 604,206 65,908 $ 20.88 3.9 years $ 6,423 Fair value information for options granted and the intrinsic value of options exercised are as follows: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Weighted average grant-date fair value of options granted $ 12.10 $ 11.33 $ 11.81 Total intrinsic value of options exercised $ 7,292 $ 3,619 $ 8,744 At December 25, 2020, total unrecognized share-based compensation expense relating to options was $7.4 million, with a weighted average remaining service period of 2.3 years. Restricted Share Units The following table summarizes RSU activity: Number of Restricted Share Units Time vesting Performance vesting Weighted average grant date fair value per share Unvested, December 27, 2019 389,170 17,730 $ 23.03 Granted 393,830 — $ 24.50 Vested (205,029 ) — $ 23.08 Forfeited (13,345 ) (17,730 ) $ 22.22 Unvested, December 25, 2020 564,626 — $ 24.09 Fair value information for RSUs granted and vested is as follows: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Weighted average grant-date fair value of shares granted $ 24.50 $ 23.25 $ 23.89 Total fair value of shares vested $ 4,731 $ 2,217 $ 2,041 At December 25, 2020, total unrecognized share-based compensation expense relating to RSUs was $11.0 million, with a weighted average remaining service period of 2.8 years. 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. As of December 25, 2020, 2.4 million ordinary shares remained eligible for issuance under the 2017 ESPP. The table below sets forth the weighted average assumptions used to measure the fair value of 2017 ESPP rights: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Weighted average expected term 0.5 years 0.5 years 0.5 years Risk-free interest rate 0.7% 2.3% 1.9% Dividend yield 0.0% 0.0% 0.0% Volatility 60.1% 56.0% 52.7% We recognize share-based compensation expense associated with the 2017 ESPP over the duration of the purchase period. We recognized $0.4 million, $0.3 million, and $0.3 million of share-based compensation expense associated with the 2017 ESPP during 2020, 2019, and 2018, respectively. At December 25, 2020, there was no unrecognized share-based compensation expense.

Segment Information

Segment Information	12 Months Ended
	Dec. 25, 2020
Segment Reporting [Abstract]
Segment Information	Note 12 – 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: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 United States of America $ 490,965 $ 329,037 $ 502,750 Singapore 303,444 198,657 224,230 Europe 70,915 56,090 60,688 Other 48,912 37,053 35,943 Total net sales $ 914,236 $ 620,837 $ 823,611 The following table sets forth our two major customers, which comprised 87%, 85%, and 88% of net sales in 2020, 2019, and 2018, respectively: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Lam Research $ 475,933 $ 319,144 $ 458,705 Applied Materials $ 316,082 $ 207,391 $ 262,146 Foreign long-lived assets, exclusive of deferred tax assets, were $31.5 million and $30.3 million at December 25, 2020 and December 27, 2019, respectively.

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 25, 2020
Earnings Per Share [Abstract]
Earnings per Share	Note 13 – Earnings per Share The following table sets forth the computation of our basic and diluted net income (loss) per share and a reconciliation of the numerator and denominator used in the calculation: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Numerator: Net income $ 33,279 $ 10,729 $ 57,883 Denominator: Basic weighted average ordinary shares outstanding 23,172,961 22,418,802 24,706,542 Dilutive effect of options 221,565 259,337 398,590 Dilutive effect of RSUs 61,761 85,603 20,530 Dilutive effect of ESPP 3,818 3,161 2,393 Diluted weighted average ordinary shares outstanding 23,460,105 22,766,903 25,128,055 Earnings per share: Net income: Basic $ 1.44 $ 0.48 $ 2.34 Diluted $ 1.42 $ 0.47 $ 2.30 A combined total of 1,430,000, 1,588,000, and 1,320,000 potentially dilutive options and RSUs were excluded from the calculation of net income per share for 2020, 2019, and 2018, respectively, because including them would have been antidilutive under the treasury stock method.

Organization and Summary of S_2

Organization and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 25, 2020
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, the United Kingdom, Singapore, Malaysia, Korea, and Mexico. 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.
Basis of Presentation	Basis of Presentation These consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the U.S. (“GAAP”). All intercompany balances and transactions have been eliminated upon consolidation. All dollar figures presented in tables in the notes to consolidated financial statements are in thousands, except per share amounts. 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
Year End	Year End We use a 52‑ or 53‑week fiscal year ending on the last Friday in December. The years ended December 25, 2020, December 27, 2019, and December 28, 2018 were all 52 weeks. All references to 2020, 2019, and 2018 are references to the fiscal years then ended.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of 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, 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 sales. 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
Commitments and Contingencies	Commitments and Contingencies 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.
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 25, 2020 and December 27, 2019, two customers represented, in the aggregate, approximately 73% and 66%, 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 29, 2017 $ 256 Charges to costs and expenses 195 Write-offs (111 ) Balance at December 28, 2018 340 Charges to costs and expenses — Write-offs (45 ) Balance at December 27, 2019 295 Charges to costs and expenses 209 Write-offs (126 ) Balance at December 25, 2020 $ 378 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 $39.9 million and $34.4 million at December 25, 2020 and December 27, 2019, respectively, and at times exceeds insured amounts. No losses have been incurred at December 25, 2020 or December 27, 2019 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 2020. We estimate the recorded value of our financial assets and liabilities approximates fair value at December 25, 2020 and December 27, 2019. We estimate the value of acquired 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 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 property & equipment Machinery 5-10 years Leasehold improvements 10 years 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 material value to 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.
Leases	Leases We determine if an arrangement is a lease, or contains a lease, at the inception of the arrangement. If we determine the arrangement is a lease, or contains a lease, at lease inception, we then determine whether the lease is an operating lease or a finance lease. Operating and finance leases result in recording a right-of-use (“ROU”) asset and lease liability on our consolidated balance sheets. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. For purposes of calculating operating lease ROU assets and operating lease liabilities, we use the non-cancellable lease term plus options to extend that we are reasonably certain to take. Lease expense for operating lease payments is recognized on a straight-line basis over the lease term.
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. During 2020 and 2019, we did not identify any triggering events that would indicate 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 intangible assets 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 25, 2020 and December 27, 2019. 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.
Share-Based Payments	Share-Based Payments We use the Black-Scholes option-pricing model to value 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 and stock option exercises. 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 operations located in the United Kingdom, Singapore, Malaysia, and Mexico, 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 expense (income), net on our consolidated statements of operations. Substantially all of our sales contracts, and most of our agreements with third-party suppliers, provide for pricing and payment in U.S. dollars. Accordingly, these transactions are not subject to material exchange rate fluctuations.
Accounting Pronouncements Recently Adopted	Accounting Pronouncements Recently Adopted In February 2016, the FASB issued ASU 2016‑02, Leases (Topic 842) , which consists of a comprehensive lease accounting standard. Under the 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. 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 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 adopted and applied the lease standard as of December 29, 2018 , the first day of fiscal year 2019, using this optional transition method. The standard provides a number of practical expedients in transition. We elected the package of practical expedients, which permits us not to reassess our prior conclusions about lease identification, lease classification, and initial direct costs. We elected to not recognize short-term leases, those with an initial term of 12 months or less, on our consolidated balance sheets. The standard had material effects on our consolidated financial statements. The most significant effects relate to the recognition of 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, we recorded operating lease liabilities of $18.1 million, with an offsetting increase to operating lease ROU assets of $17.7 million in exchange for the liabilities assumed. We did not recognize a cumulative-effect adjustment to the opening balance of retained earnings, as there was no adjustment to be made as a result of our adoption and application of the standard. The standard did not have a significant impact on our consolidated statements of operations or cash flows. In June 2016, the FASB issued ASU 2016‑13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . This standard changes the methodology for measuring credit losses on financial instruments and the timing of when such losses are recorded. We adopted the standard on the first day of the first quarter of 2020, and the adoption did not have a significant impact on our financial statements. In August 2018, the FASB issued ASU 2018‑15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350‑40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . The new guidance clarifies the accounting for implementation costs in cloud computing arrangements. We adopted the standard on the first day of the first quarter of 2020. During the 2020, we incurred capitalizable implementation costs of approximately $4.4 million in connection with our implementation of a new company-wide ERP system that is classified as a hosting arrangement that is a service contract. Accordingly, these costs are included in Other noncurrent assets on our consolidated balance sheet as of December 25, 2020. Additionally, our cash used in operating activities for 2020 includes $3.3 million in cash outflows associated with these capitalized implementation costs. As the ERP system was not yet in-service as of December 25, 2020, there was no amortization expense recognized during 2020. Accounting Pronouncements Recently Issued In December 2019, the FASB issued ASU 2019‑12, Income Taxes (Topic 740) – Simplifying the Accounting for Income Taxes , as part of its initiative to reduce complexity in accounting standards. The amendments in the ASU include removing exceptions to incremental intraperiod tax allocation of losses and gains from different financial statement components, exceptions to the method of recognizing income taxes on interim period losses, and exceptions to deferred tax liability recognition related to foreign subsidiary investments. In addition, the ASU requires that entities recognize franchise tax based on an incremental method and requires an entity to evaluate the accounting for step-ups in the tax basis of goodwill as inside or outside of a business combination. The amendments in the ASU are effective for fiscal years beginning after December 15, 2020, including interim periods therein. We have not adopted this ASU as of December 25, 2020. We are currently evaluating the impact the ASU, although we do not expect the ASU to to have a significant impact on our financial statements.

Organization and Summary of S_3

Organization and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 25, 2020
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 29, 2017 $ 256 Charges to costs and expenses 195 Write-offs (111 ) Balance at December 28, 2018 340 Charges to costs and expenses — Write-offs (45 ) Balance at December 27, 2019 295 Charges to costs and expenses 209 Write-offs (126 ) Balance at December 25, 2020 $ 378
Property Plant and Equipment Estimated Useful Lives	Property 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 property & equipment Machinery 5-10 years Leasehold improvements 10 years 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 intangible assets Trademarks 10 years Customer relationships 6-10 years Developed technology 7-10 years

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 25, 2020
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 the final allocation as of 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 Final 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

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 25, 2020
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following: December 25, 2020 December 27, 2019 Raw materials $ 88,015 $ 85,329 Work in process 38,184 31,825 Finished goods 21,299 17,700 Excess and obsolete adjustment (12,742 ) (7,817 ) Total inventories $ 134,756 $ 127,037
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 29, 2017 $ (6,022 ) Charge to cost of sales (1,871 ) Disposition of inventory 201 Balance at December 28, 2018 (7,692 ) Charge to cost of sales (1,086 ) Disposition of inventory 961 Balance at December 27, 2019 (7,817 ) Charge to cost of sales (4,649 ) Disposition of inventory (276 ) Balance at December 25, 2020 $ (12,742 )

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 25, 2020
Property Plant And Equipment [Abstract]
Summary of Property and Equipment	Property and equipment consist of the following: December 25, 2020 December 27, 2019 Machinery $ 37,196 $ 33,684 Leasehold improvements 29,616 27,835 Computer software, hardware, and equipment 6,501 5,796 Office furniture, fixtures and equipment 1,166 1,040 Vehicles 75 26 Construction-in-process 5,483 3,760 80,037 72,141 Less accumulated depreciation (38,226 ) (27,600 ) Total property and equipment, net $ 41,811 $ 44,541
Summary of Capitalized Cloud Computing Implementation Cost	The following table summarizes capitalized cloud computing implementation costs: Capitalized cloud computing implementation costs as of December 27, 2019 $ — Costs capitalized during the period 4,366 Capitalized costs amortized during the period — Capitalized cloud computing implementation costs as of December 25, 2020 $ 4,366

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 25, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Definite-Lived Intangible Assets	Definite-lived intangible assets consist of the following: December 25, 2020 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (8,717 ) $ — $ 973 10.0 years Customer relationships 84,169 (53,946 ) — 30,223 7.8 years Developed technology 11,047 (2,398 ) — 8,649 10.0 years Total intangible assets $ 104,906 $ (65,061 ) $ — $ 39,845 December 27, 2019 Gross value Accumulated amortization Accumulated impairment charges Carrying amount Weighted average useful life Trademarks $ 9,690 $ (7,750 ) $ — $ 1,940 10.0 years Customer relationships 82,986 (42,621 ) — 40,365 7.8 years Developed technology 11,047 (1,325 ) — 9,722 10.0 years Total intangible assets $ 103,723 $ (51,696 ) $ — $ 52,027
Estimated Amortization Expense of Intangible Assets	Future projected annual amortization expense consists of the following: Future amortization expense 2021 $ 13,591 2022 9,778 2023 8,552 2024 2,156 2025 2,071 Thereafter 3,697 $ 39,845
Schedule of Changes in Goodwill	The following tables present the changes to goodwill: Goodwill Balance at December 29, 2017 $ 169,399 Acquisitions 3,611 Balance at December 28, 2018 173,010 Acquisitions — Balance at December 27, 2019 173,010 Acquisitions 1,877 Balance at December 25, 2020 $ 174,887

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 25, 2020
Leases [Abstract]
Components of Lease Expense	The components of lease expense are as follows: Year Ended December 25, 2020 December 27, 2019 Operating lease cost $ 5,397 $ 5,420
Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to leases is as follows: Year Ended December 25, 2020 December 27, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,574 $ 5,220
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases is as follows: December 25, 2020 December 27, 2019 Weighted-average remaining lease term of operating leases 2.3 years 3.1 years Weighted-average discount rate of operating leases 4.5% 4.5%
Future Minimum Lease Payments Under Non-Cancellable Leases	Future minimum lease payments under non-cancellable leases as of December 25, 2020 are as follows 2021 $ 5,128 2022 4,340 2023 1,283 2024 248 2025 26 Total future minimum lease payments 11,025 Less imputed interest (625 ) Total lease liabilities $ 10,400

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 25, 2020
Income Tax Disclosure [Abstract]
Schedule of income from continuing operations before tax	Income before tax was as follows: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 United States $ (2,558 ) $ (20,993 ) $ 7,519 Foreign 34,849 25,268 46,700 Income before tax $ 32,291 $ 4,275 $ 54,219
Schedule of significant components of income tax benefit from continuing operations	Significant components of income tax benefit consist of the following: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Current: Federal $ (1,103 ) $ (812 ) $ 861 State 341 649 316 Foreign 1,461 868 1,751 Total current tax expense 699 705 2,928 Deferred: Federal (1,321 ) (5,315 ) (5,379 ) State (196 ) (1,218 ) (667 ) Foreign (170 ) (626 ) (546 ) Total deferred tax benefit (1,687 ) (7,159 ) (6,592 ) Income tax benefit $ (988 ) $ (6,454 ) $ (3,664 )
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 consist of the following: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Effective rate reconciliation: U.S. federal tax expense $ 6,781 $ 898 $ 11,386 State income taxes, net 105 (523 ) (329 ) Permanent items 298 (75 ) 30 Foreign rate differential (1,325 ) (1,051 ) (1,679 ) Tax holiday (5,911 ) (4,582 ) (7,583 ) Credits (1,411 ) (918 ) (1,158 ) Tax contingencies 80 (830 ) 168 Share-based compensation (1,002 ) (285 ) (1,270 ) Withholding tax 819 554 727 Impact of Tax Cuts and Jobs Act — — 199 Other, net 330 201 (15 ) Valuation allowance 248 157 (4,140 ) Income tax benefit $ (988 ) $ (6,454 ) $ (3,664 )
Schedule of deferred income tax assets and liabilities from continuing operations	Deferred income tax assets and liabilities consist of the following. Certain reclassifications have been made to the prior period to conform to the current period presentation. December 25, 2020 December 27, 2019 Deferred tax assets: Inventory $ 3,836 $ 3,620 Share-based compensation 2,266 2,176 Accrued payroll 2,370 906 Net operating loss carryforwards 873 938 Interest carryforwards — 1,382 Tax credits 7,943 7,318 Intercompany interest 1,689 1,500 Operating lease liabilities 2,616 3,877 Other assets 414 211 Deferred tax assets 22,007 21,928 Valuation allowance (518 ) (270 ) Total deferred tax assets 21,489 21,658 Deferred tax liabilities: Intangible assets (7,344 ) (10,482 ) Property, plant and equipment (5,273 ) (2,703 ) Operating lease right-of-use assets (2,568 ) (3,819 ) Other liabilities (89 ) (126 ) Total deferred tax liabilities (15,274 ) (17,130 ) Net deferred tax asset $ 6,215 $ 4,528
Summarizes activity related to company's unrecognized tax benefits	The following table summarizes the activity related to our unrecognized tax benefits: Unrecognized tax benefits 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 Increase in tax positions for current year 380 Increase in tax positions for prior period 8 Decrease in tax positions for prior period (784 ) Balance at December 27, 2019 1,860 Increase in tax positions for current year 378 Increase in tax positions for prior period 484 Decrease in tax positions for prior period (232 ) Balance at December 25, 2020 $ 2,490

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 25, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consists of the following: December 25, 2020 December 27, 2019 Term loan $ 153,125 $ 161,875 Revolving credit facility 49,162 19,162 Total principal amount of long-term debt 202,287 181,037 Less unamortized debt issuance costs (2,015 ) (2,983 ) Total long-term debt, net 200,272 178,054 Less current portion (8,750 ) (8,750 ) Total long-term debt, less current portion, net $ 191,522 $ 169,304
Schedule of Maturities Long-Term Debt	Maturities of long-term debt consist of the following: Future maturities of long-term debt 2021 $ 8,750 2022 8,750 2023 184,787 Total $ 202,287

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 25, 2020
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 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 Quarter ended March 29, 2019 97,910 1,599 $ 16.33 $ 8,421 Quarter ended June 28, 2019 — — $ — $ 8,421 Quarter ended September 27, 2019 — — $ — $ 8,421 Quarter ended December 27, 2019 — — $ — $ 8,421 Year ended December 27, 2019 97,910 $ 1,599 $ 16.33 $ 8,421

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 25, 2020
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 25, 2020 December 27, 2019 December 28, 2018 Weighted average expected term 5 years 5 years 5 years Risk-free interest rate 0.5% 2.1% 2.6% Dividend yield 0.0% 0.0% 0.0% Volatility 61.5% 55.3% 52.6%
Schedule of Option Activity	The following table summarizes 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 27, 2019 1,688,938 65,908 $ 20.57 Granted 234,420 — $ 23.67 Exercised (514,481 ) — $ 17.20 Forfeited or expired (83,051 ) — $ 22.49 Outstanding, December 25, 2020 1,325,826 65,908 $ 22.22 4.6 years $ 11,554 Exercisable, December 25, 2020 604,206 65,908 $ 20.88 3.9 years $ 6,423
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 25, 2020 December 27, 2019 December 28, 2018 Weighted average grant-date fair value of options granted $ 12.10 $ 11.33 $ 11.81 Total intrinsic value of options exercised $ 7,292 $ 3,619 $ 8,744
Schedule of RSU Activity	The following table summarizes RSU activity: Number of Restricted Share Units Time vesting Performance vesting Weighted average grant date fair value per share Unvested, December 27, 2019 389,170 17,730 $ 23.03 Granted 393,830 — $ 24.50 Vested (205,029 ) — $ 23.08 Forfeited (13,345 ) (17,730 ) $ 22.22 Unvested, December 25, 2020 564,626 — $ 24.09
Schedule of Fair Value Information for RSUs Granted and Vested	Fair value information for RSUs granted and vested is as follows: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Weighted average grant-date fair value of shares granted $ 24.50 $ 23.25 $ 23.89 Total fair value of shares vested $ 4,731 $ 2,217 $ 2,041
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 25, 2020 December 27, 2019 December 28, 2018 Weighted average expected term 0.5 years 0.5 years 0.5 years Risk-free interest rate 0.7% 2.3% 1.9% Dividend yield 0.0% 0.0% 0.0% Volatility 60.1% 56.0% 52.7%

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 25, 2020
Segment Reporting [Abstract]
Schedule of Sales By Geographic Area	The following table sets forth sales by geographic area: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 United States of America $ 490,965 $ 329,037 $ 502,750 Singapore 303,444 198,657 224,230 Europe 70,915 56,090 60,688 Other 48,912 37,053 35,943 Total net sales $ 914,236 $ 620,837 $ 823,611
Summary of Segment Information Major Customers	The following table sets forth our two major customers, which comprised 87%, 85%, and 88% of net sales in 2020, 2019, and 2018, respectively: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Lam Research $ 475,933 $ 319,144 $ 458,705 Applied Materials $ 316,082 $ 207,391 $ 262,146

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 25, 2020
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income (Loss) Per Share	The following table sets forth the computation of our basic and diluted net income (loss) per share and a reconciliation of the numerator and denominator used in the calculation: Year Ended December 25, 2020 December 27, 2019 December 28, 2018 Numerator: Net income $ 33,279 $ 10,729 $ 57,883 Denominator: Basic weighted average ordinary shares outstanding 23,172,961 22,418,802 24,706,542 Dilutive effect of options 221,565 259,337 398,590 Dilutive effect of RSUs 61,761 85,603 20,530 Dilutive effect of ESPP 3,818 3,161 2,393 Diluted weighted average ordinary shares outstanding 23,460,105 22,766,903 25,128,055 Earnings per share: Net income: Basic $ 1.44 $ 0.48 $ 2.34 Diluted $ 1.42 $ 0.47 $ 2.30

Organization and Summary of S_4

Organization and Summary of Significant Accounting Policies - Additional Information (Details 1)	Dec. 25, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-12-26
Organization And Summary Of Significant Accounting Policies [Line Items]
Performance obligation satisfaction period	12 months

Organization and Summary of S_5

Organization and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 25, 2020USD ($)Customer	Dec. 27, 2019USD ($)Customer	Dec. 29, 2018USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Cash held in foreign-based commercial banks	$ 252,899,000	$ 60,612,000
Percentage threshold of likelihood of tax positions being realized upon settlement with taxing authority	50.00%
Operating lease, ROU assets	$ 10,088,000	14,198,000	$ 17,700,000
Operating lease, lease liabilities	10,400,000		$ 18,100,000
ERP System
Organization And Summary Of Significant Accounting Policies [Line Items]
Capitalizable implementation cost on hosting arrangement contract	4,400
Payments for capitalized implementation cost on hosting arrangement contract	3,300
Amortization cost on hosting arrangement service contract	$ 0
Accounting Standards Update 2016-02
Organization And Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Dec. 29, 2018
Change in accounting principle, accounting standards update, immaterial effect	true
Accounting Standards Update 2016-13
Organization And Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Dec. 28, 2019
Change in accounting principle, accounting standards update, immaterial effect	true
Accounting Standards Update 2018-15
Organization And Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Dec. 28, 2019
Foreign
Organization And Summary Of Significant Accounting Policies [Line Items]
Cash held in foreign-based commercial banks	$ 39,900,000	34,400,000
Losses incurred exceeding the insured limits	$ 0	$ 0
Accounts Receivable | Customer Concentration Risk
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, Percentage	73.00%	66.00%
Number of customers | Customer	2	2
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Extended product warranty period	1 year
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Extended product warranty period	2 years

Organization and Summary of S_6

Organization and Summary of Significant Accounting Policies - Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Allowance For Doubtful Accounts Receivable Rollforward
Beginning Balance	$ 295	$ 340	$ 256
Charges to costs and expenses	209		195
Write-offs	(126)	(45)	(111)
Ending Balance	$ 378	$ 295	$ 340

Organization and Summary of S_7

Organization and Summary of Significant Accounting Policies - Property Plant And Equipment Estimated Useful Lives (Details)	12 Months Ended
	Dec. 25, 2020
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	10 years
Vehicles
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	5 years
Minimum | Machinery
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	5 years
Minimum | Office Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	5 years
Maximum | Machinery
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	10 years
Maximum | Office Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	7 years
Computer Software, Hardware and Equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	3 years
Computer Software, Hardware and Equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives of property & equipment	5 years

Organization and Summary of S_8

Organization and Summary of Significant Accounting Policies - Schedule of Finite Lived Intangible Assets Useful Lives (Details)	12 Months Ended
	Dec. 25, 2020
Trademarks
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets	10 years
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets	6 years
Customer Relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets	10 years
Developed Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets	7 years
Developed Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets	10 years

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ in Thousands	Dec. 01, 2020	Dec. 28, 2018	Apr. 19, 2018	Dec. 28, 2018	Dec. 25, 2020	Dec. 27, 2019	Dec. 29, 2017
Business Acquisition [Line Items]
Goodwill		$ 173,010		$ 173,010	$ 174,887	$ 173,010	$ 169,399
Precision Machining Operation
Business Acquisition [Line Items]
Acquisition amount	$ 5,000
Tangible operating assets	2,000
Goodwill	1,900
IAN Engineering Co., Ltd.
Business Acquisition [Line Items]
Acquisition amount		6,543	$ 6,500
Tangible operating assets		396		396
Allocated intangible assets		1,559		1,559
Goodwill		$ 2,862		2,862
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
Net sales attributable to acquiree included in statement of operations				$ 7,700
Customer Relationships | Precision Machining Operation
Business Acquisition [Line Items]
Allocated intangible assets	$ 1,200
Weighted average amortization period	6 years
Customer Relationships | IAN Engineering Co., Ltd.
Business Acquisition [Line Items]
Allocated intangible assets			$ 1,600
Weighted average amortization period			6 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	Apr. 19, 2018	Dec. 28, 2018	Dec. 25, 2020	Dec. 27, 2019	Dec. 29, 2017
Business Acquisition [Line Items]
Goodwill	$ 173,010		$ 173,010	$ 174,887	$ 173,010	$ 169,399
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)

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 27, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 88,015	$ 85,329
Work in process	38,184	31,825
Finished goods	21,299	17,700
Excess and obsolete adjustment	(12,742)	(7,817)
Total inventories	$ 134,756	$ 127,037

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. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Inventory [Line Items]
Beginning Balance	$ (7,817)	$ (7,692)	$ (6,022)
Charge to cost of sales	(4,649)	(1,086)	(1,871)
Disposition of inventory	(276)	961	201
Ending Balance	$ (12,742)	$ (7,817)	$ (7,692)

Property and Equipment - Summar

Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 27, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 80,037	$ 72,141
Less accumulated depreciation	(38,226)	(27,600)
Total property and equipment, net	41,811	44,541
Machinery
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	37,196	33,684
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	29,616	27,835
Office Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,166	1,040
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	75	26
Construction-In-Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	5,483	3,760
Computer Software, Hardware and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 6,501	$ 5,796

Property and Equipment - Additi

Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Property Plant And Equipment [Abstract]
Depreciation expense	$ 10.9	$ 8.9	$ 7.7

Property and Equipment - Summ_2

Property and Equipment - Summary of Capitalized Cloud Computing Implementation Cost (Details) $ in Thousands	12 Months Ended
	Dec. 25, 2020USD ($)
Property Plant And Equipment [Abstract]
Costs capitalized during the period	$ 4,366
Capitalized cloud computing implementation costs as of December 25, 2020	$ 4,366

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Schedule of Definite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019
Finite Lived Intangible Assets [Line Items]
Gross value	$ 104,906	$ 103,723
Accumulated amortization	(65,061)	(51,696)
Carrying amount	39,845	52,027
Trademarks
Finite Lived Intangible Assets [Line Items]
Gross value	9,690	9,690
Accumulated amortization	(8,717)	(7,750)
Carrying amount	$ 973	$ 1,940
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	$ 84,169	$ 82,986
Accumulated amortization	(53,946)	(42,621)
Carrying amount	$ 30,223	$ 40,365
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	$ 11,047	$ 11,047
Accumulated amortization	(2,398)	(1,325)
Carrying amount	$ 8,649	$ 9,722
Developed Technology | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	10 years	10 years
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

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 27, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	$ 13,591
2022	9,778
2023	8,552
2024	2,156
2025	2,071
Thereafter	3,697
Carrying amount	$ 39,845	$ 52,027

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Schedule of Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Goodwill [Roll Forward]
Goodwill balance	$ 173,010	$ 173,010	$ 169,399
Acquisitions	1,877	0	3,611
Goodwill balance	$ 174,887	$ 173,010	$ 173,010

Leases - Additional Information

Leases - Additional Information (Detail)	12 Months Ended
	Dec. 25, 2020Operatinglease
Leases [Abstract]
Non-cancellable net operating lease expiration year	2025
Lessee, operating lease, not yet commenced, description	As of December 25, 2020, we had no operating leases executed for which the rental period had not yet commenced.
Number of operating lease executed	0

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019
Leases [Abstract]
Operating lease cost	$ 5,397	$ 5,420

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 5,574	$ 5,220

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Detail)	Dec. 25, 2020	Dec. 27, 2019
Leases [Abstract]
Weighted-average remaining lease term of operating leases	2 years 3 months 18 days	3 years 1 month 6 days
Weighted-average discount rate of operating leases	4.50%	4.50%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments Under Non-Cancellable Leases (Detail) - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 29, 2018
Leases [Abstract]
2021	$ 5,128
2022	4,340
2023	1,283
2024	248
2025	26
Total future minimum lease payments	11,025
Less imputed interest	(625)
Total lease liabilities	$ 10,400	$ 18,100

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Income Taxes [Line Items]
Refund claim from carry back of net operating loss	$ 1,000
Corporate income tax rate	21.00%			35.00%
Foreign tax credits carryforward, resulting in discrete benefit			$ 4,100
Operating loss carryforwards, federal	$ 100
Operating loss carryforwards, state	5,400
Operating loss carryforwards, foreign	2,200
Foreign tax credits	2,200
Tax holiday	5,911	$ 4,582	7,583
Unrecognized tax benefits for uncertain tax positions	2,490	1,860	2,256	$ 1,910
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,100
Decrease in unrecognized tax benefits is reasonably possible	100
Unrecognized tax benefits, income tax penalties	400
Unrecognized tax benefits, interest on income taxes expense	0
Other Non-current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits for uncertain tax positions	2,500
Singapore
Income Taxes [Line Items]
Tax holiday	5,900	$ 4,600	$ 7,600
Federal
Income Taxes [Line Items]
Tax credit carryforward amount	2,900
State
Income Taxes [Line Items]
Tax credit carryforward amount	$ 100
Maximum
Income Taxes [Line Items]
CARES act of 2020, net operating loss carryback period	5 years	5 years	5 years

Income Taxes - Summary of Infor

Income Taxes - Summary of Information on Company's Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
United States	$ (2,558)	$ (20,993)	$ 7,519
Foreign	34,849	25,268	46,700
Income before income taxes	$ 32,291	$ 4,275	$ 54,219

Income Taxes - Significant Comp

Income Taxes - Significant Components of Income Tax Benefit From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Current:
Federal	$ (1,103)	$ (812)	$ 861
State	341	649	316
Foreign	1,461	868	1,751
Total current tax expense	699	705	2,928
Deferred:
Federal	(1,321)	(5,315)	(5,379)
State	(196)	(1,218)	(667)
Foreign	(170)	(626)	(546)
Total deferred tax benefit	(1,687)	(7,159)	(6,592)
Income tax benefit	$ (988)	$ (6,454)	$ (3,664)

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. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Effective rate reconciliation:
U.S. federal tax expense	$ 6,781	$ 898	$ 11,386
State income taxes, net	105	(523)	(329)
Permanent items	298	(75)	30
Foreign rate differential	(1,325)	(1,051)	(1,679)
Tax holiday	(5,911)	(4,582)	(7,583)
Credits	(1,411)	(918)	(1,158)
Tax contingencies	80	(830)	168
Share-based compensation	(1,002)	(285)	(1,270)
Withholding tax	819	554	727
Impact of Tax Cuts and Jobs Act			199
Other, net	330	201	(15)
Valuation allowance	248	157	(4,140)
Income tax benefit	$ (988)	$ (6,454)	$ (3,664)

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 27, 2019
Deferred tax assets:
Inventory	$ 3,836	$ 3,620
Share-based compensation	2,266	2,176
Accrued payroll	2,370	906
Net operating loss carryforwards	873	938
Interest carryforwards		1,382
Tax credits	7,943	7,318
Intercompany interest	1,689	1,500
Operating lease liabilities	2,616	3,877
Other assets	414	211
Deferred tax assets	22,007	21,928
Valuation allowance	(518)	(270)
Total deferred tax assets	21,489	21,658
Deferred tax liabilities:
Intangible assets	(7,344)	(10,482)
Property, plant and equipment	(5,273)	(2,703)
Operating lease right-of-use assets	(2,568)	(3,819)
Other liabilities	(89)	(126)
Total deferred tax liabilities	(15,274)	(17,130)
Net deferred tax asset	$ 6,215	$ 4,528

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. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward
Beginning balance	$ 1,860	$ 2,256	$ 1,910
Increase in tax positions for current year	378	380	407
Increase in tax positions for prior period	484	8
Decreases in tax positions for prior period	(232)	(784)	(61)
Ending balance	$ 2,490	$ 1,860	$ 2,256

Employee Benefit Programs - Add

Employee Benefit Programs - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
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	$ 1.9	$ 1.5	$ 1.5
Maximum
Defined Contribution Plan Disclosure [Line Items]
Percentage of maximum annual contributions per employee	4.00%

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 27, 2019
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 202,287	$ 181,037
Less unamortized debt issuance costs	(2,015)	(2,983)
Total long-term debt, net	200,272	178,054
Less current portion	(8,750)	(8,750)
Total long-term debt, less current portion, net	191,522	169,304
Term Loan
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	153,125	161,875
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 49,162	$ 19,162

Long-Term Debt - Maturities of

Long-Term Debt - Maturities of long Term Debt Consist (Detail) - USD ($) $ in Thousands	Dec. 25, 2020	Dec. 27, 2019
Debt Disclosure [Abstract]
2021	$ 8,750
2022	8,750
2023	184,787
Total	$ 202,287	$ 181,037

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Details) $ in Thousands	Feb. 15, 2018USD ($)	Dec. 25, 2020USD ($)	Dec. 27, 2019USD ($)	Dec. 28, 2018
Line Of Credit Facility [Line Items]
Weighted average interest rate across all credit facilities		3.75%	4.78%	4.36%
Total principal amount of long-term debt		$ 202,287	$ 181,037
Term Loan
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt		153,125	161,875
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt		$ 49,162	$ 19,162
Credit Agreement
Line Of Credit Facility [Line Items]
Debt issuance costs	$ 2,100
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 0.75‑1.50% and 1.75‑2.50% 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 | 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%
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 | Term Loan
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 175,000
Credit facility, periodic principal payments		$ 2,200
Credit facility, frequency of principal payments		quarterly
Credit Agreement | Term Loan | Eurodollar Rate
Line Of Credit Facility [Line Items]
Interest rate		3.50%
Credit Agreement | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Total principal amount of long-term debt	$ 125,000
Credit Agreement | Revolving Credit Facility | Eurodollar Rate
Line Of Credit Facility [Line Items]
Interest rate		2.73%
Credit Agreement | Revolving Credit Facility | Minimum
Line Of Credit Facility [Line Items]
Percentage of commitment fee on unused portion of revolver	0.20%
Credit Agreement | Revolving Credit Facility | Maximum
Line Of Credit Facility [Line Items]
Percentage of commitment fee on unused portion of revolver	0.35%
Credit Agreement | Credit Facilities
Line Of Credit Facility [Line Items]
Principal payments maturity date		Feb. 15, 2023

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	Dec. 14, 2020	Aug. 18, 2018	Aug. 31, 2018	Dec. 25, 2020	Feb. 28, 2018
Shareholders Equity [Line Items]
Net proceeds from public offering				$ 139,372
Share repurchase program, authorized amount					$ 50,000
Increase in stock repurchase program authorized amount		$ 50,000	$ 50,000
Underwritten Public Offering
Shareholders Equity [Line Items]
Ordinary shares issued	4.6
Net proceeds from public offering	$ 139,400
Underwriting discount per share	$ 1.35
Incremental offering expenses	$ 500

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					12 Months Ended
	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 27, 2019	Dec. 28, 2018	Sep. 27, 2019	Jun. 28, 2019	Aug. 18, 2018	Feb. 15, 2018
Equity [Abstract]
Total Number of Shares Repurchased	97,910	1,657,565	1,424,359	1,061,855	195,750	97,910	4,339,529
Total Cost of Repurchase	$ 1,599	$ 29,662	$ 30,348	$ 24,970	$ 5,000	$ 1,599	$ 89,980
Average Price Paid per Share	$ 16.33	$ 17.89	$ 21.31	$ 23.52	$ 25.54	$ 16.33	$ 20.73
Amount Available Under Repurchase Program	$ 8,421	$ 10,021	$ 39,683	$ 20,030	$ 45,000	$ 8,421	$ 10,021	$ 8,421	$ 8,421	$ 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

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details) - USD ($)	Jan. 06, 2020	Jan. 18, 2018	May 31, 2017	Mar. 31, 2012	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018	Dec. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense for Options, RSUs and employee share purchase rights across all plans					$ 9,900,000	$ 8,500,000	$ 7,600,000
Share-based compensation arrangement by share-based payment award, plan modification, description					On November 12, 2019, in connection with the transition of our former Chief Executive Officer to Executive Chairman, the Compensation Committee of the Board of Directors modified all outstanding equity awards such that the next 18 months of vesting events would be pulled forward and become immediately vested on January 6, 2020.
Vesting period of equity awards pulled forward and vested immediately					18 months
Share-based compensation					$ 9,875,000	8,537,000	7,577,000
Total unrecognized share-based compensation expense relating to restricted shares					$ 7,400,000
Weighted average remaining service period					2 years 3 months 18 days
Accounting Standards Update 2016-09
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 1,400,000	$ 2,900,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options vested	98,825	88,445
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted shares vested	60,721	39,175
Total unrecognized share-based compensation expense relating to restricted shares					$ 11,000,000
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 of options and RSUs 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 of options and RSUs generally occurred 25% on the first anniversary of the date of grant and quarterly thereafter over the remaining 3 years.
Awards vesting period				3 years
Issuances of equity based awards					0
2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense for Options, RSUs and employee share purchase rights across all plans					$ 400,000	$ 300,000	$ 300,000
Total unrecognized share-based compensation expense relating to restricted shares					$ 0
Purchase price equal to percentage of fair market value of ordinary shares			85.00%
2017 Employee Stock Purchase Plan | Ordinary Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares remained eligible for issuance			2,400,000

Share-Based Compensation - Sche

Share-Based Compensation - Schedule of Stock Options Valuation Assumptions (Details) - Stock Options	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Weighted average expected term	5 years	5 years	5 years
Risk-free interest rate	0.50%	2.10%	2.60%
Dividend yield	0.00%	0.00%	0.00%
Volatility	61.50%	55.30%	52.60%

Share-Based Compensation - Sc_2

Share-Based Compensation - Schedule of Option Activity (Details) - Stock Options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 25, 2020USD ($)$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average exercise price per share, Outstanding, Beginning Balance | $ / shares	$ 20.57
Weighted average exercise price per share, Granted | $ / shares	23.67
Weighted average exercise price per share, Exercised | $ / shares	17.20
Weighted average exercise price per share, Forfeited or expired | $ / shares	22.49
Weighted average exercise price per share, Outstanding, Ending Balance | $ / shares	22.22
Weighted average exercise price per share, Exercisable | $ / shares	$ 20.88
Weighted average remaining contractual term, Outstanding	4 years 7 months 6 days
Weighted average remaining contractual term, Exercisable	3 years 10 months 24 days
Aggregate intrinsic value, Outstanding | $	$ 11,554
Aggregate intrinsic value, Exercisable | $	$ 6,423
Time Vesting
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Stock Options, Outstanding, Beginning Balance	1,688,938
Number of Stock Options, Granted	234,420
Number of Stock Options, Exercised	(514,481)
Number of Stock Options, Forfeited or expired	(83,051)
Number of Stock Options, Outstanding, Ending Balance	1,325,826
Number of Stock Options, Exercisable	604,206
Performance Vesting
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Stock Options, Outstanding, Beginning Balance	65,908
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. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]
Weighted average grant-date fair value of options granted	$ 12.10	$ 11.33	$ 11.81
Total intrinsic value of options exercised	$ 7,292	$ 3,619	$ 8,744

Share-Based Compensation - Sc_3

Share-Based Compensation - Schedule of RSU Activity (Details)	12 Months Ended
	Dec. 25, 2020$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value per share, Unvested, Beginning Balance | $ / shares	$ 23.03
Weighted average grant date fair value per share, Granted | $ / shares	24.50
Weighted average grant date fair value per share, Vested | $ / shares	23.08
Weighted average grant date fair value per share, Forfeited | $ / shares	22.22
Weighted average grant date fair value per share, Unvested, Ending Balance | $ / shares	$ 24.09
Time Vesting Restricted Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Restricted Share Units, Unvested, Beginning Balance	389,170
Number of Restricted Share Units, Granted	393,830
Number of Restricted Share Units, Vested	(205,029)
Number of Restricted Share Units, Forfeited	(13,345)
Number of Restricted Share Units, Unvested, Ending Balance	564,626
Performance Vesting Restricted Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Restricted Share Units, Unvested, Beginning Balance	17,730
Number of Restricted Share Units, Forfeited	(17,730)
Number of Restricted Share Units, Unvested, Ending Balance

Share Based Compensation - Sc_2

Share Based Compensation - Schedule of Fair Value Information for RSUs Granted and Vested (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of shares granted	$ 24.50
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of shares granted	$ 24.50	$ 23.25	$ 23.89
Total fair value of shares vested	$ 4,731	$ 2,217	$ 2,041

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. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Weighted average expected term	5 years	5 years	5 years
Risk-free interest rate	0.50%	2.10%	2.60%
Dividend yield	0.00%	0.00%	0.00%
Volatility	61.50%	55.30%	52.60%
2017 Employee Stock Purchase Plan
Weighted average expected term	6 months	6 months	6 months
Risk-free interest rate	0.70%	2.30%	1.90%
Dividend yield	0.00%	0.00%	0.00%
Volatility	60.10%	56.00%	52.70%

Segment Information - Additiona

Segment Information - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 25, 2020USD ($)Segment	Dec. 27, 2019USD ($)	Dec. 28, 2018
Segment Reporting Information [Line Items]
Number of operating segment | Segment	1
Foreign long-lived assets, exclusive of deferred tax assets | $	$ 31.5	$ 30.3
Two Major Customer | Sales Revenue, Net
Segment Reporting Information [Line Items]
Percentage of net sales from continuing operations from two customers	87.00%	85.00%	88.00%

Segment Information - Schedule

Segment Information - Schedule of Sales By Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Segment Reporting Information [Line Items]
Total net sales	$ 914,236	$ 620,837	$ 823,611
United States of America
Segment Reporting Information [Line Items]
Total net sales	490,965	329,037	502,750
Singapore
Segment Reporting Information [Line Items]
Total net sales	303,444	198,657	224,230
Europe
Segment Reporting Information [Line Items]
Total net sales	70,915	56,090	60,688
Other
Segment Reporting Information [Line Items]
Total net sales	$ 48,912	$ 37,053	$ 35,943

Segment Information - Sales fro

Segment Information - Sales from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Segment Reporting Information [Line Items]
Net sales	$ 914,236	$ 620,837	$ 823,611
Lam Research
Segment Reporting Information [Line Items]
Net sales	475,933	319,144	458,705
Applied Materials
Segment Reporting Information [Line Items]
Net sales	$ 316,082	$ 207,391	$ 262,146

Earnings per Share - Computatio

Earnings per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 33,279	$ 10,729	$ 57,883
Basic weighted average ordinary shares outstanding	23,172,961	22,418,802	24,706,542
Diluted weighted average ordinary shares outstanding	23,460,105	22,766,903	25,128,055
Net income:
Basic	$ 1.44	$ 0.48	$ 2.34
Diluted	$ 1.42	$ 0.47	$ 2.30
Options
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect of shares	221,565	259,337	398,590
RSUs
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect of shares	61,761	85,603	20,530
ESPP
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect of shares	3,818	3,161	2,393

Earnings per Share - Additional

Earnings per Share - Additional Information (Details) - shares	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Earnings Per Share [Abstract]
Potential dilutive options and RSUs excluded from computation of net income (loss) per share	1,430,000	1,588,000	1,320,000