Ultra Clean (UCTT) 10-Q 29 Oct 24 2024 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 27, 2024	Oct. 24, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 27, 2024
Document Transition Report	false
Entity File Number	000-50646
Entity Registrant Name	Ultra Clean Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	61-1430858
Entity Address, Address Line One	26462 Corporate Avenue
Entity Address, City or Town	Hayward
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94545
City Area Code	510
Local Phone Number	576-4400
Title of 12(b) Security	Common stock, par value $0.001 per share
Trading Symbol	UCTT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		45,060,067
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001275014
Current Fiscal Year End Date	--12-27

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Current assets:
Cash and cash equivalents	$ 318.2	$ 307
Accounts receivable, net of allowance for credit losses of $2.1 and $1.0 at September 27, 2024 and December 29, 2023, respectively	228.1	180.8
Inventories	402.6	374.5
Prepaid expenses and other current assets	36.9	30.9
Total current assets	985.8	893.2
Property, plant and equipment, net	327.7	328.3
Goodwill	265.3	265.2
Intangible assets, net	192.4	215.3
Deferred tax assets, net	3.6	3.1
Operating lease right-of-use assets	162.2	151.7
Other non-current assets	10.5	10.9
Total assets	1,947.5	1,867.7
Current liabilities:
Bank borrowings	16.4	17.6
Accounts payable	233.2	192.9
Accrued compensation and related benefits	47.9	47.7
Operating lease liabilities	19	18.1
Other current liabilities	42.3	33.7
Total current liabilities	358.8	310
Bank borrowings, net of current portion	475.8	461.2
Deferred tax liabilities	18.9	19
Operating lease liabilities	155.6	143
Other liabilities	16	37.3
Total liabilities	1,025.1	970.5
Commitments and contingencies (See Note 9)
UCT stockholders’ equity:
Preferred stock — $0.001 par value, 10.0 shares authorized; none outstanding	0	0
Common stock — $0.001 par value, 90.0 shares authorized; 46.6 and 46.1 shares issued and 45.1 and 44.6 shares outstanding at September 27, 2024 and December 29, 2023, respectively	0.1	0.1
Additional paid-in capital	552.6	541.5
Common shares held in treasury, at cost, 1.5 and 1.5 shares at September 27, 2024 and December 29, 2023, respectively	(45)	(45)
Retained earnings	354.1	346.7
Accumulated other comprehensive loss	(3.9)	(4.4)
Total UCT stockholders' equity	857.9	838.9
Noncontrolling interests	64.5	58.3
Total equity	922.4	897.2
Total liabilities and equity	$ 1,947.5	$ 1,867.7

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Statement of Financial Position [Abstract]
Account receivable, allowance for credit losses	$ 2.1	$ 1
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10	10
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	90	90
Common stock, shares issued (in shares)	46.6	46.1
Common stock, shares outstanding (in shares)	45.1	44.6
Common shares held in treasury (in shares)	1.5	1.5

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Revenues:
Total revenues	$ 540.4	$ 435	$ 1,534.3	$ 1,289.8
Cost of revenues:
Total cost revenues	447	369.8	1,269.8	1,083.5
Gross margin	93.4	65.2	264.5	206.3
Operating expenses:
Research and development	7.1	7.4	21.2	21.7
Sales and marketing	14.4	12.8	42.9	38.6
General and administrative	46.7	39.3	135.1	115.3
Total operating expenses	68.2	59.5	199.2	175.6
Income from operations	25.2	5.7	65.3	30.7
Interest income	1.1	1.2	3.9	2.5
Interest expense	(12)	(12.3)	(35.8)	(35.9)
Other income (expense), net	(4.1)	(2.1)	9.3	(0.8)
Income before provision for income taxes	10.2	(7.5)	42.7	(3.5)
Provision for income taxes	9.9	5.3	28.2	17.1
Net income (loss)	0.3	(12.8)	14.5	(20.6)
Less: Net income attributable to noncontrolling interests	2.6	1.7	7.1	6.7
Net income (loss) attributable to UCT	$ (2.3)	$ (14.5)	$ 7.4	$ (27.3)
Net income (loss) per share attributable to UCT common stockholders:
Basic (in dollars per share)	$ (0.05)	$ (0.32)	$ 0.16	$ (0.61)
Diluted (in dollars per share)	$ (0.05)	$ (0.32)	$ 0.16	$ (0.61)
Shares used in computing net income (loss) per share:
Basic (in shares)	45	44.8	44.8	44.8
Diluted (in shares)	45	44.8	45.4	44.8
Product
Revenues:
Total revenues	$ 479	$ 380.9	$ 1,350.2	$ 1,112
Cost of revenues:
Total cost revenues	403.3	329.3	1,141.2	955.5
Services
Revenues:
Total revenues	61.4	54.1	184.1	177.8
Cost of revenues:
Total cost revenues	$ 43.7	$ 40.5	$ 128.6	$ 128

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 0.3	$ (12.8)	$ 14.5	$ (20.6)
Other comprehensive income (loss):
Change in cumulative translation adjustment, net of tax	6.4	(2.1)	0.1	(3.8)
Change in pension net actuarial gain, net of tax	0	(0.2)	0	(0.4)
Change in fair value of derivatives, net of tax	0	0	0	0.2
Total other comprehensive income (loss)	6.4	(2.3)	0.1	(4)
Comprehensive income (loss)	6.7	(15.1)	14.6	(24.6)
Comprehensive income, attributable to noncontrolling interests	5.5	0.6	6.7	8
Comprehensive income (loss) attributable to UCT	$ 1.2	$ (15.7)	$ 7.9	$ (32.6)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023
Cash flows from operating activities:
Net income (loss)	$ 14.5	$ (20.6)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	34.1	27.9
Amortization of intangible assets	22.9	16.9
Stock-based compensation	12.7	8.7
Amortization of debt issuance costs	2.4	2.9
Change in the fair value of financial instruments	(21.7)	(0.3)
Deferred income taxes	(1.2)	0.1
Loss (gain) on sale of property, plant and equipment	1.2	(1.1)
Changes in assets and liabilities:
Accounts receivable	(47.3)	83.2
Inventories	(28.1)	65.6
Prepaid expenses and other current assets	(2.9)	7.5
Other non-current assets	0.6	0.8
Accounts payable	46.1	(61.2)
Accrued compensation and related benefits	0.2	(11.8)
Income taxes payable	1.4	(8.9)
Operating lease assets and liabilities	8.1	(3.7)
Other liabilities	4.9	(5.4)
Net cash provided by operating activities	47.9	100.6
Cash flows from investing activities:
Purchases of property, plant and equipment	(46.2)	(59.2)
Proceeds from sale of equipment	0	2.3
Net cash used in investing activities	(46.2)	(56.9)
Cash flows from financing activities:
Proceeds from bank borrowings	67.7	0
Proceeds from issuance of common stock	0.9	0
Extinguishment of bank borrowings	(44.2)	0
Principal payments on bank borrowings	(10.1)	(34.7)
Payment of debt issuance costs	(2.5)	(0.3)
Employees' taxes paid upon vesting of restricted stock units	(2.5)	(2.2)
Payments of dividends to a joint venture shareholder	(0.5)	(0.1)
Repurchase of shares	0	(23.7)
Net cash provided by (used in) financing activities	8.8	(61)
Effect of exchange rate changes on cash and cash equivalents	0.7	0.5
Net increase (decrease) in cash and cash equivalents	11.2	(16.8)
Cash and cash equivalents at beginning of period	307	358.8
Cash and cash equivalents at end of period	318.2	342
Supplemental cash flow information:
Income taxes paid, net of income tax refunds	28.1	26.7
Interest paid	33.7	33
Non-cash investing and financing activities:
Property, plant and equipment purchased included in accounts payable and other liabilities	$ 3.9	$ 12

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Total Stockholders’ Equity of UCT	Common Stock	Additional Paid-in Capital	Treasury shares	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance at Dec. 30, 2022	$ 937	$ 887.9	$ 0.1	$ 530.8	$ (15.4)	$ 377.8	$ (5.4)	$ 49.1
Common stock, shares, beginning balance (in shares) at Dec. 30, 2022			45,200,000
Treasury stock, shares, beginning balance (in shares) at Dec. 30, 2022					900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance under employee stock plans (in shares)			500,000
Employees' taxes paid upon vesting of restricted stock units (in shares)			(100,000)
Employees' taxes paid upon vesting of restricted stock units	(2.2)	(2.2)		(2.2)
Repurchase of shares (in shares)			(800,000)		(800,000)
Repurchase shares	(23.7)	(23.7)	$ (23.7)		$ (23.7)
Stock-based compensation expense	8.7	8.7		8.7
Net income (loss)	(20.6)	(27.3)				(27.3)		6.7
Dividend payments to a joint venture shareholder	(0.1)							(0.1)
Other comprehensive income (loss)	(4)	(5.4)					(5.4)	1.4
Ending balance at Sep. 29, 2023	895.1	838	$ 0.1	537.3	$ (39.1)	350.5	(10.8)	57.1
Treasury stock, shares, ending balance (in shares) at Sep. 29, 2023					1,700,000
Common stock, shares, ending balance (in shares) at Sep. 29, 2023			44,800,000
Beginning balance at Jun. 30, 2023	906.2	849.8	$ 0.1	533.3	$ (39.1)	365	(9.5)	56.4
Common stock, shares, beginning balance (in shares) at Jun. 30, 2023			44,800,000
Treasury stock, shares, beginning balance (in shares) at Jun. 30, 2023					1,700,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares (in shares)			0
Stock-based compensation expense	4	4		4
Net income (loss)	(12.8)	(14.5)				(14.5)		1.7
Other comprehensive income (loss)	(2.3)	(1.3)					(1.3)	(1)
Ending balance at Sep. 29, 2023	895.1	838	$ 0.1	537.3	$ (39.1)	350.5	(10.8)	57.1
Treasury stock, shares, ending balance (in shares) at Sep. 29, 2023					1,700,000
Common stock, shares, ending balance (in shares) at Sep. 29, 2023			44,800,000
Beginning balance at Dec. 29, 2023	$ 897.2	838.9	$ 0.1	541.5	$ (45)	346.7	(4.4)	58.3
Common stock, shares, beginning balance (in shares) at Dec. 29, 2023	44,600,000		44,600,000
Treasury stock, shares, beginning balance (in shares) at Dec. 29, 2023	1,500,000				1,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance under employee stock plans (in shares)			600,000
Issuance under employee stock plans	$ 0.9	0.9		0.9
Employees' taxes paid upon vesting of restricted stock units (in shares)			100,000
Employees' taxes paid upon vesting of restricted stock units	(2.5)	(2.5)		(2.5)
Repurchase of shares (in shares)			0
Stock-based compensation expense	12.7	12.7		12.7
Net income (loss)	14.5	7.4				7.4		7.1
Dividend payments to a joint venture shareholder	(0.5)							(0.5)
Other comprehensive income (loss)	0.1	0.5					0.5	(0.4)
Ending balance at Sep. 27, 2024	$ 922.4	857.9	$ 0.1	552.6	$ (45)	354.1	(3.9)	64.5
Treasury stock, shares, ending balance (in shares) at Sep. 27, 2024	1,500,000				1,500,000
Common stock, shares, ending balance (in shares) at Sep. 27, 2024	45,100,000		45,100,000
Beginning balance at Jun. 28, 2024	$ 911.7	852.3	$ 0.1	548.2	$ (45)	356.4	(7.4)	59.4
Common stock, shares, beginning balance (in shares) at Jun. 28, 2024			45,000,000
Treasury stock, shares, beginning balance (in shares) at Jun. 28, 2024					1,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance under employee stock plans (in shares)			100,000
Issuance under employee stock plans	0	0		0
Employees' taxes paid upon vesting of restricted stock units (in shares)			0
Employees' taxes paid upon vesting of restricted stock units	(0.3)	(0.3)		(0.3)
Repurchase of shares (in shares)			0
Stock-based compensation expense	4.7	4.7		4.7
Net income (loss)	0.3	(2.3)				(2.3)		2.6
Dividend payments to a joint venture shareholder	(0.4)							(0.4)
Other comprehensive income (loss)	6.4	3.5					3.5	2.9
Ending balance at Sep. 27, 2024	$ 922.4	$ 857.9	$ 0.1	$ 552.6	$ (45)	$ 354.1	$ (3.9)	$ 64.5
Treasury stock, shares, ending balance (in shares) at Sep. 27, 2024	1,500,000				1,500,000
Common stock, shares, ending balance (in shares) at Sep. 27, 2024	45,100,000		45,100,000

Organization and Significant Ac

Organization and Significant Accounting Policies	9 Months Ended
	Sep. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Significant Accounting Policies	ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Organization — Ultra Clean Holdings, Inc., (the “Company” or “UCT”) a Delaware corporation, was founded in November 2002 and became a publicly traded company on the NASDAQ Global Market in March 2004. The Company is a leading developer and supplier of critical subsystems, components, parts, and ultra-high purity cleaning and analytical services, primarily for the semiconductor industry. UCT offers its customers an integrated outsourced solution for major subassemblies, improved design-to-delivery cycle times, design for manufacturability, prototyping and part and component manufacturing, as well as tool chamber parts cleaning and coating, and micro-contamination analytical services. The Company’s Products business primarily designs, engineers and manufactures production tools, components and parts, and modules and subsystems for the semiconductor and display capital equipment markets. Products include chemical delivery modules, frame assemblies, gas delivery systems, fluid delivery systems, precision robotics, process modules, sub-fab process equipment support racks, as well as other high-level assemblies. The Company’s Services business provides ultra-high purity parts cleaning, process tool part recoating, surface encapsulation and high sensitivity micro contamination analysis primarily for the semiconductor device makers and wafer fabrication equipment markets. Basis of Presentation — The unaudited Condensed Consolidated Financial Statements included in this quarterly report on Form 10-Q include the accounts of the Company and its majority-owned subsidiaries and have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). This financial information reflects all adjustments which are, in the opinion of the Company, normal, recurring and necessary for a fair statement of the results of operations, financial position, and cash flows for the interim periods presented. Certain information and footnote disclosures normally included in our annual financial statements, prepared in accordance with GAAP, have been condensed or omitted from the interim financial statements in this Quarterly Report on Form 10-Q. Therefore, these unaudited financial statements should be read in conjunction with the Consolidated Financial Statements contained in the Company's Annual Report on Form 10-K for the year ended December 29, 2023. Fiscal Year — The Company uses a 52-53 week fiscal year ending on the Friday nearest December 31. All references to quarters refer to fiscal quarters and all references to years refer to fiscal years. Principles of Consolidation — The Company’s Condensed Consolidated Financial Statements include the accounts of the Company and its majority-owned subsidiaries and all intercompany accounts and transactions have been eliminated upon consolidation. Significant Accounting Policies — There were no changes to the accounting policies disclosed in Note 1, Organization and Significant Accounting Polices of the Company’s Annual Report on Form 10-K for the year ended December 29, 2023 that had a material impact on the Company's condensed consolidated financial statements and related notes. Impairment Testing of Long-Lived Assets and Goodwill — In the second quarter of 2024, the Company conducted an interim impairment test of its long-lived assets and goodwill associated with its HIS Innovations Group (“HIS”) reporting unit due to the presence of an indicator of potential impairment. This indicator included lower-than-expected financial performance. The Company reviewed the HIS asset group’s long-lived assets for impairment by comparing the carrying value to the estimated undiscounted future cash flows expected to be generated by the assets. Based on this assessment, the Company determined that the estimated undiscounted future cash flows exceeded the carrying values of the long-lived assets. Consequently, no impairment loss was recognized in the period. The Company performed a quantitative assessment of goodwill for the HIS reporting unit using the income approach. The income approach involves estimating the future cash flows attributable and discounting these cash flows to their present value using an appropriate discount rate. The fair value of the reporting unit was then compared to its carrying amount, including goodwill. The results of this quantitative assessment indicated that the fair value of the reporting unit exceeded its carrying amount. As a result, the Company concluded that no impairment of goodwill was necessary. Accounting Standards Recently Adopted The Company has not adopted any new accounting standards during the nine months ended September 27, 2024 that have a material impact on the Company’s condensed consolidated financial statements. Accounting Standards Not Yet Adopted In November 2023, FASB issued Accounting Standard Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. The Company is required to adopt this standard in the fiscal year 2024 for the annual reporting ending December 27, 2024, with retrospective disclosure of prior periods presented. The Company expects this ASU to only impact its disclosures with no impact to its results of operations, cash flows and financial condition. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which amends the guidance in ASC 740, Income Taxes. ASU No. 2023-09 is intended to improve the transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. It also includes certain other amendments to improve the effectiveness of income tax disclosures. The Company is required to adopt this standard prospectively in fiscal year 2025 for the annual reporting period ending December 26, 2025. The Company is currently evaluating the potential impact of adopting this new guidance on its consolidated financial statements and related disclosures.

Business Combinations

Business Combinations	9 Months Ended
	Sep. 27, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Business Combinations	BUSINESS COMBINATIONS On October 25, 2023, the Company acquired 100% of the shares of HIS, a privately held company based in Hillsboro, Oregon. HIS is a leading supplier to the semiconductor sub-fab segment including the design, manufacturing, and integration of components, process solutions, and fully integrated sub-systems. The acquisition strengthens the Company's leadership in developing and supplying critical products to the semiconductor industry, and extends our reach into the sub-fab area. The purchase price of HIS for purposes of the Company’s purchase price allocation was determined to be $73.6 million, which includes initial cash consideration of $46.5 million and the fair value of potential earn-out payments of approximately $27.1 million. These potential earn-out payments represent up to $70.0 million of cash consideration that may be payable based on the financial performance of the acquired business during the fiscal years 2023, 2024, and 2025. The fair value of the potential earn-out payments was determined utilizing a Monte Carlo simulation model. The Company has assigned the purchase price of HIS to the tangible assets, liabilities and identifiable intangible assets acquired, based on their estimated fair values. The excess of purchase price over the aggregate fair value was recorded as goodwill. Goodwill associated with the acquisition is primarily attributable to the future technology, market presence and knowledgeable and experienced workforce. The fair value assigned to identifiable intangible assets acquired was determined using the income approach taking into account the Company’s consideration of a number of inputs, including a third-party analysis that was based upon estimates and assumptions provided by the Company. These estimates and assumptions were determined through established and generally accepted valuation techniques and with the assistance of a valuation specialist. During the third quarter of fiscal year 2024, the Company completed the acquisition accounting and the valuation of the fair value of the assets acquired and the liabilities assumed. The following table summarizes the fair values of assets acquired and liabilities assumed at the date of acquisition, including all measurement period adjustments: (In millions) Amount Cash and cash equivalents $ 0.4 Accounts receivable 5.6 Inventories 11.4 Prepaid expenses and other assets 2.7 Property, plant and equipment 9.3 Purchased intangible assets 51.6 Operating lease right-of-use assets 7.5 Accounts payable (8.1) Accrued compensation and related benefits (0.7) Other current liabilities (0.9) Deferred tax liabilities (12.1) Operating lease liabilities (9.6) Total identifiable net assets $ 57.1 Goodwill $ 16.5 The following table summarizes the intangible assets acquired and the useful lives of these assets: Purchased Useful Intangible (In years) (In millions) Customer relationships 7 $ 35.2 IP knowhow 5 11.2 Developed technology 5 4.6 Backlog 1 0.6 Total purchased intangible assets $ 51.6 The results of operations for HIS have been included in the Company's condensed consolidated financial statements since the date of the acquisition. In addition, acquisition-related costs of $0.6 million and $1.0 million were included in the results of operations for the three and nine months ended September 27, 2024, respectively. Acquisition-related costs for the three and nine months ended September 29, 2023 were immaterial. Acquisition costs are included in general and administrative expenses in the Company’s condensed consolidated results of operations.

Balance Sheet Information

Balance Sheet Information	9 Months Ended
	Sep. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Information	BALANCE SHEET INFORMATION Inventories consisted of the following: (In millions) September 27, December 29, Raw materials $ 205.5 $ 197.9 Work in process 133.9 107.2 Finished goods 63.2 69.4 Total $ 402.6 $ 374.5 Property, plant and equipment, net, consisted of the following: (In millions) September 27, December 29, Land $ 2.2 $ 5.6 Buildings 57.0 57.1 Leasehold improvements 135.5 110.8 Machinery and equipment 220.2 207.4 Computer equipment and software 75.7 72.2 Furniture and fixtures 5.3 5.0 495.9 458.1 Accumulated depreciation (204.6) (170.3) Construction in progress 36.4 40.5 Total $ 327.7 $ 328.3 Long-lived assets used in operations are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable and the undiscounted cash flows estimated to be generated by the asset are less than the asset’s carrying value. Refer to Note 1, “Organization and Significant Accounting Policies” for additional information regarding impairment testing of long-lived assets.

Fair Value

Fair Value	9 Months Ended
	Sep. 27, 2024
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy: Fair Value Measurement at Description September 27, 2024 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In millions) Other non-current assets: Plan assets $ 0.5 $ — $ — $ 0.5 Other current liabilities: Forward contracts $ 0.5 $ — $ 0.5 $ — Other liabilities: Pension obligation $ 1.6 $ — $ — $ 1.6 Contingent earn-out $ 7.1 $ — $ — $ 7.1 Fair Value Measurement at Description December 29, 2023 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In millions) Other non-current assets: Plan assets $ 1.3 $ — $ — $ 1.3 Other current liabilities: Forward contracts $ 0.1 $ — $ 0.1 $ — Other liabilities: Pension obligation $ 1.6 $ — $ — $ 1.6 Contingent earn-out $ 29.1 $ — $ — $ 29.1 The estimated fair value of foreign currency forward contracts is based upon quoted market prices obtained from independent pricing services for similar derivative contracts and these financial instruments are characterized as Level 2 assets in the fair value hierarchy. The estimated fair value of pension obligation is based on expected years of service and average compensation. The valuation model used to value pension obligation utilizes mortality rate, inflation, interest rate risks and changes in the life expectancy for pensioners. These assumptions are routinely made in the appraisal process by the independent actuary resulting in a Level 3 classification. As of September 27, 2024, the Company's aggregate pension benefit obligations was $12.3 million and the fair value of the pension plan assets was $11.2 million. The underfunded pension benefit obligations was $1.1 million as of September 27, 2024. The Company recognizes the overfunded or underfunded status of defined benefit pension plans, measured as the difference between the fair value of the plan assets and the benefit obligation. Each overfunded plan is recognized as an asset and each underfunded plan is recognized as a liability. The Company measures its contingent earn-out liabilities at fair value on a recurring basis using a Monte Carlo simulation model. The significant unobservable inputs used in the model include the forecasted operating profit of the acquired business during each of calendar years 2024 and 2025. Significant increases or decreases to the forecasted results would result in a significantly higher or lower liability, with a higher liability capped by the contractual maximum of the contingent earn-out obligation. Ultimately, the liability will be equivalent to the amount paid, and the difference between the fair value estimate and amount paid will be recorded in earnings. The amount paid that is less than or equal to the contingent earn-out liability on the acquisition date is reflected as cash used in financing activities in the consolidated statements of cash flows. Any amount paid in excess of the contingent earn-out liability on the acquisition date will be reflected as cash used in operating activities in the consolidated statements of cash flows. For the three and nine months ended September 27, 2024, the Company recorded $(0.8) million of loss and $22.0 million of gain, respectively from change in the fair value of contingent earn-out related to the acquisition of HIS. This gain (loss) from change in the fair value was recognized as other income (expense), net in the Condensed Consolidated Statements of Operations.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 27, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS Goodwill The Company’s methodology for allocating the purchase price relating to an acquisition is determined through established and generally accepted valuation techniques. Goodwill is measured as the excess of the consideration transferred over the sum of the amounts assigned to tangible and identifiable intangible assets acquired less liabilities assumed. To test goodwill for impairment, the Company first performs a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If the Company concludes it is more likely than not that the fair value of a reporting unit exceeds its carrying amount, the Company does not proceed to perform a quantitative impairment test. If the Company concludes it is more likely than not that the fair value of the reporting unit is less than its carrying value, a quantitative goodwill impairment test will be performed by comparing the fair value of each reporting unit to its carrying value. A quantitative impairment analysis, if necessary, considers the income approach, which requires estimates of the present value of expected future cash flows to determine a reporting unit’s fair value. Significant estimates include revenue growth rates and operating margins used to calculate projected future cash flows, discount rates, and future economic and market conditions. A goodwill impairment charge is recognized for the amount by which the reporting unit’s fair value is less than its carrying value. Any loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The process of evaluating the potential impairment of goodwill and intangible assets requires significant judgment. The Company regularly monitors current business conditions and other factors including, but not limited to, adverse industry or economic trends and lower projections of profitability that may impact future operating results. During the three and nine months ended September 27, 2024, there were no changes to the Company's reporting units, and the Company did not recognize any impairment charges or additions to goodwill. Refer to Note 1, “Organization and Significant Accounting Policies” for additional information regarding impairment testing of goodwill. Details of aggregate goodwill of the Company are as follows: (In millions) Products Services Total Balance at September 27, 2024 $ 191.8 $ 73.5 $ 265.3 Intangible Assets Intangible assets are generally recorded in connection with a business acquisition. The Company evaluates the useful lives of its intangible assets each reporting period to determine whether events and circumstances require revising the remaining period of amortization. In addition, the Company reviews finite-lived intangible assets for impairment whenever events or changes in circumstances indicate the carrying value may not be recoverable and evaluates indefinite-lived intangible asset for impairment annually, or more frequently if indicators of potential impairment exist. Management considers such indicators as significant differences in product demand from the estimates, changes in the competitive and economic environment, technological advances, and changes in cost structure. Refer to Note 1, “Organization and Significant Accounting Policies” for additional information regarding impairment testing of intangible assets. Details of intangible assets were as follows: As of September 27, 2024 As of December 29, 2023 (Dollars in millions) Useful Life Gross Accumulated Carrying Gross Accumulated Carrying Customer relationships 6 - 10 $ 207.2 $ (112.4) $ 94.8 $ 207.2 $ (97.5) $ 109.7 Recipes 20 73.2 (22.4) 50.8 73.2 (19.5) 53.7 Intellectual property/know-how 7 - 15 48.9 (21.7) 27.2 48.9 (18.4) 30.5 Tradename 4 - 6* 32.5 (22.7) 9.8 32.5 (22.1) 10.4 Standard operating procedures 20 8.6 (2.6) 6.0 8.6 (2.3) 6.3 Developed technology 5 4.6 (0.8) 3.8 4.6 (0.2) 4.4 Backlog 1 0.6 (0.6) — 0.6 (0.3) 0.3 Total $ 375.6 $ (183.2) $ 192.4 $ 375.6 $ (160.3) $ 215.3 * The Company concluded that the asset life of UCT tradename of $9.0 million is indefinite and is therefore not amortized but is reviewed for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The Company amortizes its intangible assets on a straight-line or accelerated basis over the estimated economic life of the assets. Amortization expense was approximately $7.6 million and $22.9 million for the three and nine months ended September 27, 2024, respectively, and $5.5 million and $16.9 million for the three and nine months ended September 29, 2023, respectively. Amortization expense related to recipes, standard operating procedures, developed technology and certain intellectual property/know-how is charged to cost of revenues and the remainder is charged to general and administrative expense. As of September 27, 2024, future estimated amortization expense is expected to be as follows: (In millions) Amortization 2024 (remaining in year) $ 7.5 2025 28.1 2026 27.2 2027 26.9 2028 23.8 Thereafter 69.9 Total $ 183.4

Borrowing Arrangements

Borrowing Arrangements	9 Months Ended
	Sep. 27, 2024
Debt Disclosure [Abstract]
Borrowing Arrangements	BORROWING ARRANGEMENTS On April 4, 2024, the Company entered into a Sixth Amendment (the “Sixth Amendment”) to the Credit Agreement dated as of August 27, 2018 (as amended as of October 1, 2018, March 31, 2021, August 19, 2022, June 29, 2023 and July 27, 2023 (the “Existing Credit Agreement”), and the Existing Credit Agreement as further amended by the Sixth Amendment, the “Credit Agreement”). Pursuant to the Sixth Amendment, the Existing Credit Agreement was amended to, among other things, (i) extend the final maturity date of the term loan and revolving credit facilities under the Credit Agreement by 30 months; (ii) reduce the interest rate applicable to the term loan facility under the Credit Agreement by 0.25% per annum; and (iii) increase the outstanding amount under the Term Loan of $475.4 million to $500 million. The Sixth Amendment resulted in the receipts of an additional $67.7 million of debt, net of $1.1 million related lender fees from new or existing syndicate lenders which was offset by syndicate lenders who reduced their positions by $44.2 million. The Company capitalized additional $2.5 million of costs related to this amendment and continued to defer previously capitalized costs of $5.2 million. The Company expensed the third party transaction costs and the previously capitalized costs of extinguished debt of $3.6 million which was included in the other income (expense), net in the Condensed Consolidated Statements of Operations for the three and nine month period ended September 27, 2024. The Company pays monthly interest payments in arrears and quarterly principal payments of 0.625% of the outstanding principal balance since April 4, 2024, with the remaining principal paid upon maturity. The revolving credit facility has an available commitment of $150.0 million and a maturity date of August 27, 2027. The Company pays a quarterly commitment fee in arrears equal to 0.25% of the average daily available commitment outstanding. Outstanding letters of credit reduce the availability of the revolving credit facility and, as of September 27, 2024, the Company had $146.0 million, net of $4.0 million of outstanding letters of credit, available under this revolving credit facility. The letter of credit facility has an available commitment of $50.0 million and a maturity date of August 27, 2027. The Company pays a quarterly fee in arrears equal to 2.5% (subject to certain adjustments to the Term Loan) of the dollar equivalent of all outstanding letters of credit, and a fronting fee equal to 0.125% of the undrawn and unexpired amount of each letter of credit. As of September 27, 2024, the Company had $4.0 million of outstanding letters of credit and $46.0 million of available commitments remaining under the letter of credit facility. On June 29, 2023, the Company entered into a Fourth Amendment (the “Fourth Amendment”) to the Credit Agreement to replace the LIBOR-based reference interest rate option with a reference interest option based upon Term SOFR under the Credit Agreement. Under the Credit Agreement, the Company may elect that the Term Loan bear interest at a rate per annum equal to either (a) “ABR” (as defined in the Credit Agreement), plus the applicable margin or (b) the “Eurodollar Rate” (as defined in the Credit Agreement), based on SOFR, plus the applicable margin. The applicable margin for the Term Loan is equal to a rate per annum to either (i) at any time that the Company’s corporate family rating is Ba3 (with a stable outlook) or higher from Moody’s and BB- (with a stable outlook) or higher from S&P, (x) 3.25% for such Eurodollar term loans and (y) 2.25% for such ABR term loans or (ii) at all other times, (x) 3.50% for such Eurodollar term loans and (y) 2.50% for such ABR term loans. Interest on the Term Loan is payable on (1) in the case of such ABR term loans, the last day of each calendar quarter and (2) in the case of such Eurodollar term loans, the last day of each relevant interest period and, in the case of any interest period longer than three months, on each successive date three months after the first day of such interest period. At September 27, 2024, the Company had an outstanding amount under the Term Loan of $493.8 million, gross of unamortized debt issuance costs of $7.7 million. As of September 27, 2024, the interest rate on the outstanding Term Loan was 8.9%. The Credit Agreement requires the Company to maintain certain financial covenants including a consolidated fixed charge coverage ratio and a consolidated leverage ratio (as defined in the Credit Agreement) as of the last day of any fiscal quarter. The Company currently has no revolving loans outstanding under the Credit Agreement. As of September 27, 2024, the Company was in compliance with the financial covenants contained within the Credit Agreement. The Company has a credit agreement with a local bank in the Czech Republic that provides for a revolving credit facility in the aggregate of up to 7.0 million euros (approximately $7.8 million). As of September 27, 2024, no debt was outstanding under this revolving credit facility. Fluid Solutions has credit facilities with various financial institutions in Israel that provides borrowing up to $11.0 million. As of September 27, 2024, Fluid Solutions had a $6.1 million outstanding balance under these facilities with interest rate of 7.1%. As of September 27, 2024, the Company’s total bank debt was $492.2 million, net of unamortized debt issuance costs of $7.7 million. As of September 27, 2024, the Company had $146.0 million, $4.9 million, and $7.8 million available to draw from its credit facilities in the U.S., Israel and Czech Republic, respectively. The fair value of the Company’s long-term debt was based on Level 2 inputs, and fair value was determined using quoted prices for similar liabilities in inactive markets. The Company’s carrying value approximates fair value for the Company’s long-term debt.

Income Tax

Income Tax	9 Months Ended
	Sep. 27, 2024
Income Tax Disclosure [Abstract]
Income Tax	INCOME TAX The Company's effective tax rate was 97.1% and (70.7)% for the three months ended September 27, 2024 and September 29, 2023, respectively, and 66.0% and (488.6)% for the nine months ended September 27, 2024 and September 29, 2023, respectively. The Company’s income tax provision was $9.9 million and $5.3 million for the three months ended September 27, 2024 and September 29, 2023, respectively, and $28.2 million and $17.1 million for the nine months ended September 27, 2024 and September 29, 2023, respectively. The change in respective tax rates reflects, primarily, changes in the geographic mix of worldwide earnings and financial results in jurisdictions which are taxed at different rates and the impact of losses in jurisdictions with full valuation allowances on deferred tax assets. Company management continuously evaluates the need for a valuation allowance and, as of September 27, 2024, concluded that a full valuation allowance on its U.S. federal and state and certain of its foreign deferred tax assets was still appropriate. As of September 27, 2024 and September 29, 2023, the Company’s gross liability for unrecognized tax benefits, excluding interest, was $3.1 million and $2.7 million, respectively. Increases or decreases to interest and penalties on uncertain tax positions are included in the income tax provision in the Condensed Consolidated Statements of Operations. Although it is possible that some of the unrecognized tax benefits could be settled within the next twelve months, the Company cannot reasonably estimate the outcome at this time.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 27, 2024
Retirement Benefits [Abstract]
Retirement Plans	RETIREMENT PLANS Defined Benefit Plans Cinos Korea has a noncontributory defined benefit pension plan covering substantially all of its employees upon their retirement. The Company's entities in Israel also have noncontributory defined benefit pension plans covering their employees upon their retirement. The benefits for these plans are based on expected years of service and average compensation. The net period costs are recognized as employees render the services necessary to earn the postretirement benefits. The Company records annual amounts relating to the pension plan based on calculations that incorporate various actuarial and other assumptions, including discount rates, mortality, assumed rates of return, compensation increases and turnover rates. The Company reviews its assumptions on an annual basis and makes modifications to the assumptions based on current and expected rates of return and trends when it is appropriate to do so. The effect of modifications to those assumptions is recorded in accumulated other comprehensive income and amortized to net periodic cost over future periods using the corridor method. The Company believes that the assumptions utilized in recording its obligations under the plans are reasonable based on its experience and market conditions. As of September 27, 2024, the benefit obligation of the plans was $12.3 million and the fair value of the benefit plan assets was $11.2 million which are invested in several fixed deposit accounts with financial institutions. As of September 27, 2024, the underfunded balance of the plans of $1.1 million has been recorded by the Company and is included in other liabilities. Amounts recognized in accumulated other comprehensive loss and contributed for the three and nine months ended September 27, 2024 were negligible. The Company and its subsidiaries contributed $0.1 million during the three and nine months ended September 29, 2023 and recognized $0.2 million and $0.4 million in accumulated other comprehensive loss for the three and nine months ended September 29, 2023. As of September 27, 2024, the Company's future estimated payment obligations for the respective fiscal years are as follows: (In millions) 2024 $ 0.4 2025 1.7 2026 2.5 2027 1.4 2028 1.2 Thereafter 10.8 Total $ 18.0 Employee Savings and Retirement Plan The Company sponsors a 401(k) savings and retirement plan (the “401(k) Plan”) for all U.S. employees who meet certain eligibility requirements. Participants can elect to contribute to the 401(k) Plan, on a pre-tax basis, up to 25% of their salary to a maximum of the IRS limit. The Company matches 50.0% of each employee's contribution, up to a maximum of 6% of the employee's eligible earnings. The Company made $0.8 million and $2.7 million discretionary employer contributions to the 401(k) Plan for the three and nine months ended September 27, 2024 and $0.9 million and $2.5 million for the three and nine months ended September 29, 2023.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 27, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Commitments The Company leases real estate and equipment under various non-cancelable operating leases. Contingencies From time to time, the Company is subject to various legal proceedings and claims, either asserted or unasserted, that arise in the ordinary course of business. Although the outcome of the various legal proceedings and claims individually or in the aggregate cannot be predicted with certainty, the Company has not had a history of outcomes to date that have been material to the Condensed Consolidated Statements of Operations and does not believe that any of these proceedings or other claims will have a material adverse effect on its consolidated financial condition, results of operations or cash flows.

Stockholders' Equity and Noncon

Stockholders' Equity and Noncontrolling Interests	9 Months Ended
	Sep. 27, 2024
Noncontrolling Interest [Abstract]
Stockholders' Equity and Noncontrolling Interests	STOCKHOLDERS’ EQUITY AND NONCONTROLLING INTERESTS Treasury Stock On October 20, 2022, the Board of Directors approved a share repurchase program authorizing the Company to purchase up to an aggregate of $150 million of the Company’s common stock over a three-year period. No shares were repurchased under this program for the three and nine months ended September 27, 2024, and for the three months ended September 29, 2023. For the nine months ended September 29, 2023, approximately 0.8 million shares were repurchased under this program with an aggregate cost of $23.7 million. The Company may reissue these treasury shares as part of its stock-based compensation programs. Non-controlling Interests The Company owns part of the outstanding shares of Cinos Korea, a South Korean company that provides outsourced cleaning and recycling of precision parts for the semiconductor industry through its operating facilities in South Korea and through a partial interest in Cinos China.

Employee Stock Plans

Employee Stock Plans	9 Months Ended
	Sep. 27, 2024
Postemployment Benefits [Abstract]
Employee Stock Plans	EMPLOYEE STOCK PLANS Employee Stock Plans The Company grants stock awards in the form of restricted stock units (“RSUs”) and performance stock units (“PSUs”) to its employees as part of the Company’s long-term equity compensation plan. These stock awards are granted to employees with a unit purchase price of zero dollars and typically vest over three years, subject to the employee’s continued service with the Company and, in the case of PSUs, subject to achieving certain performance goals and market conditions. The Company also grants common stock to its board members in the form of restricted stock awards (“RSAs”), which vest on the earlier of the next Annual Shareholder Meeting, or 365 days from date of grant. Stock-based compensation expense includes compensation costs related to estimated fair values of awards granted. The estimated fair value of the Company’s equity-based awards is amortized on a straight-line basis over the awards’ vesting period and is adjusted for performance as it relates to PSUs. The following table shows the Company’s stock-based compensation expense included in the Condensed Consolidated Statements of Operations: Three Months Ended Nine Months Ended (In millions) September 27, September 29, September 27, September 29, Cost of revenues (1) $ 0.5 $ 0.3 $ 1.3 $ 0.9 Research and development 0.1 0.1 0.2 0.2 Sales and marketing 0.4 0.4 1.4 1.1 General and administrative 3.7 3.2 9.8 6.5 Total stock-based compensation $ 4.7 $ 4.0 $ 12.7 $ 8.7 (1) Stock-based compensation expense capitalized in inventory for the three and nine months ended September 27, 2024 and September 29, 2023 were immaterial. For the three and nine months ended September 27, 2024, 27 thousand and 502 thousand RSUs were granted with a weighted average fair value of $39.72 and $41.37 per share, respectively. For the three and nine months ended September 29, 2023, 14 thousand and 567 thousand RSUs were granted with a weighted average fair value of $32.55 and $28.41 per share, respectively. For the nine months ended September 27, 2024 and September 29, 2023, 125 thousand and 145 thousand PSUs were granted, respectively. No PSUs were granted for the three months ended September 27, 2024 and September 29, 2023. For the nine months ended September 27, 2024and September 29, 2023, 26 thousand and 37 thousand RSAs were granted, respectively. No RSAs were granted for the three months ended September 27, 2024 and September 29, 2023. The following table summarizes the Company’s combined RSU, PSU and RSA activity for the nine months ended September 27, 2024: (In millions) Number of Aggregate Outstanding at December 29, 2023 1.4 $ 46.1 Granted 0.7 Vested (0.4) Forfeited (0.3) Outstanding at September 27, 2024 1.4 56.7 Expected to vest at September 27, 2024 1.4 $ 56.7 As of September 27, 2024, approximately $29.4 million of unrecognized stock-based compensation cost related to employee and director awards remains to be amortized on a straight-line basis over a weighted average period of 1.9 years, and will be adjusted for subsequent changes in future grants. The total unamortized expense of the Company’s unvested RSAs as of September 27, 2024 was $0.8 million. Under the current PSU program, performance goals are set at the time of grant and performance is reviewed at the end of a three-year period. The percentage to be applied to each participant’s target award ranges from zero to 200%, based upon the extent to which the financial performance goals are achieved. If specific performance threshold levels for the financial goals are met on an annual basis, the amount earned for that element will be applied to one-third of the participant’s PSU award granted to determine the number of total units earned. Recipients of PSU awards generally must remain employed by the Company on a continuous basis through the end of the three-year performance period in order to receive any amount of the PSUs covered by that award. In events such as death, disability or retirement, the recipient may be entitled to pro-rata amounts of PSUs as defined in the Plan. Target shares subject to PSU awards do not have voting rights of common stock until earned and issued following the end of the three-year performance period. Employee Stock Purchase Plan The ESPP permits employees to purchase common stock at a discount through payroll withholdings at certain specified dates (purchase period) within a defined offering period. The purchase price is 85% of the fair market value of the common stock at the end of the purchase period and is intended to qualify as an “employee stock purchase plan” under Section 423 of the Internal Revenue Code. During the nine months ended September 27, 2024, 42 thousand shares were issued under the ESPP. No shares were issued under the ESPP during the three months ended September 27, 2024. The Company recorded $0.2 million and $0.5 million of expense related to ESPP for the three and nine months ended September 27, 2024.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 27, 2024
Revenue from Contract with Customer [Abstract]
Revenue Recognition	REVENUE RECOGNITION Revenue is recognized when the Company satisfies the performance obligations as evidenced by the transfer of control of the promised goods or services to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company sells its products and services primarily to customers in the semiconductor capital equipment industry. The Company’s revenues are highly concentrated, and therefore highly dependent upon a small number of customers. Typical payment terms with our customers range from thirty The Company’s Products business segment provides warranty on its products for a period of up to two years and provides for warranty costs at the time of sale based on historical activity. Determination of the warranty reserve requires the Company to make estimates of product return rates and expected costs to repair or replace the products under warranty. If actual return rates and/or repair and replacement costs differ significantly from these estimates, adjustments to recognize additional cost of revenues may be required in future periods. The warranty reserve is included in other current liabilities on the Condensed Consolidated Balance Sheets and is not considered significant. The Company’s products are manufactured and services provided at the Company's locations throughout the Americas, Asia Pacific and Europe and the Middle East (“EMEA”). Sales to customers are initiated through a purchase order and are governed by our standard terms and conditions, written agreements, or both. Revenue is recognized when performance obligations under the terms of an agreement with a customer are satisfied; generally, this occurs with the transfer of control of the products or when the Company provides the services. Based on the enforceable rights included in our agreements or prevailing terms and conditions, products produced by the Company without an alternative use are not protected by an enforceable right of payment that includes a reasonable profit throughout the duration of the agreement. Consignment sales are recognized in revenue at the earlier of the period that the goods are consumed or after a period of time subsequent to receipt by the customer as specified by terms of the agreement, provided control of the promised goods or services has transferred. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. Sales, value-add, and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. Certain of our customers may receive cash-based incentives, such as rebates or credits, which are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenues recognized. Accruals for unpaid customer rebates of $1.8 million and $2.0 million as of September 27, 2024 and December 29, 2023, respectively, were netted against accounts receivable. The Company's disaggregated revenues are apportioned by segments within the Company’s Condensed Consolidated Statement of Operations. The Company’s principal markets include America, Asia Pacific and EMEA. The Company's foreign operations are conducted primarily through its subsidiaries in China, Malaysia, Singapore, Israel, Taiwan, South Korea, United Kingdom and the Czech Republic. Revenues by geographic area are categorized based on the customer’s location to which the products were shipped or services were performed. The following table sets forth revenue by geographic area: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Singapore $ 173.9 $ 155.4 $ 500.0 $ 446.5 United States 145.6 125.8 432.7 393.7 China 56.7 26.7 171.2 80.8 Austria 48.9 33.1 131.6 94.9 South Korea 25.3 21.9 73.6 71.9 Taiwan 23.2 20.0 60.3 60.5 Others 66.8 52.1 164.9 141.5 Total $ 540.4 $ 435.0 $ 1,534.3 $ 1,289.8 The Company’s most significant customers (having individually accounted for 10% or more of revenues) and their related revenues as a percentage of total revenues were as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Lam Research Corporation 31.2 % 33.0 % 31.4 % 34.5 % Applied Materials, Inc. 21.8 25.7 22.4 22.9 Total 53.0 % 58.7 % 53.9 % 57.4 % Three customers’ accounts receivable balances, Lam Research Corporation, ASML Holding NV and Applied Materials, Inc., were individually greater than 10% of accounts receivable as of September 27, 2024, in the aggregate approximately 35.0% of the Company's total accounts receivable.

Leases

Leases	9 Months Ended
	Sep. 27, 2024
Leases [Abstract]
Leases	LEASES The Company leases land, offices, facilities and equipment in locations throughout the United States, Asia Pacific and EMEA. In 2023, the Company entered into a 60-year land lease in Malaysia with the intent of building a manufacturing site. The commencement date of the lease occurred in July 2024 contemporaneous with the Company obtaining control of the identified asset. In the first quarter of 2024, the Company commenced a 10-year lease of manufacturing space in Austin, Texas, with a single 7-year renewal option at lease end. Additionally, the Company’s subsidiary in Czech Republic entered into 8-year lease of additional manufacturing and office space. As a result, $21.9 million and $16.8 million were recorded at commencement date to operating lease right-of-use assets and to operating lease liabilities, respectively, in the Company’s Condensed Consolidated Balance Sheet .

Net Income (Loss) Per Share

Net Income (Loss) Per Share	9 Months Ended
	Sep. 27, 2024
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	NET INCOME (LOSS) PER SHARE The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income (loss) per share: Three Months Ended Nine Months Ended (In millions, except share amounts) September 27, September 29, September 27, September 29, Numerator: Net income (loss) attributable to UCT $ (2.3) $ (14.5) $ 7.4 $ (27.3) Denominator: Shares used in computation — basic: Weighted average common shares outstanding 45.0 44.8 44.8 44.8 Shares used in computation — diluted: Weighted average common shares outstanding 45.0 44.8 44.8 44.8 Effect of potential dilutive securities: Employee stock plans — — 0.6 — Shares used in computing diluted net income (loss) per share 45.0 44.8 45.4 44.8 Net income (loss) per share attributable to UCT — basic $ (0.05) $ (0.32) $ 0.16 $ (0.61) Net income (loss) per share attributable to UCT — diluted $ (0.05) $ (0.32) $ 0.16 $ (0.61)

Reportable Segments

Reportable Segments	9 Months Ended
	Sep. 27, 2024
Segment Reporting [Abstract]
Reportable Segments	REPORTABLE SEGMENTS The Company prepares financial results based on three operating segments (Products, Services, and HIS) and two reportable segments (Products and Services). The Products and HIS operating segments have been aggregated into the Products reportable segment based upon consistency of economic characteristics, nature of products, similarity of production process, and class of customers. The Company’s Chief Executive Officer (chief operating decision maker) views and evaluates operations based on the results of each of the operating segments. The following table describes each reportable segment: Segment Product or Services Primary Markets Served Geographic Areas Products Assembly Semiconductor Americas Asia Pacific EMEA Services Cleaning Semiconductor Americas Asia Pacific EMEA The Company uses segment profit or loss as the primary measure of profitability to evaluate operating performance and to allocate capital resources. Segment profit or loss is defined as a segment’s income or loss from continuing operations before other income and income taxes included in the accompanying Condensed Consolidated Statements of Operations. Any intercompany sales and associated profit (and any other intercompany items) are eliminated from segment results. There were no significant intercompany eliminations for the periods presented. Segment Data Three Months Ended Nine Months Ended (In millions) September 27, September 29, September 27, September 29, Revenues: Products $ 479.0 $ 380.9 $ 1,350.2 $ 1,112.0 Services 61.4 54.1 184.1 177.8 Total segment revenues $ 540.4 $ 435.0 $ 1,534.3 $ 1,289.8 Gross margin: Products $ 75.7 $ 51.6 $ 209.0 $ 156.5 Services 17.7 13.6 55.5 49.8 Total segment gross margin $ 93.4 $ 65.2 $ 264.5 $ 206.3 Income from operations: Products $ 22.4 $ 7.7 $ 55.9 $ 27.3 Services 2.8 (2.0) 9.4 3.4 Total segment income from operations $ 25.2 $ 5.7 $ 65.3 $ 30.7 (In millions) September 27, December 29, Assets Products $ 1,670.8 $ 1,617.5 Services 276.7 250.2 Total segment assets $ 1,947.5 $ 1,867.7 Long-lived assets comprised of operating lease right-of-use assets and property, plant and equipment, net, reported based on the location of the asset. The carrying amount of long-lived assets in United States, Malaysia, Israel, South Korea and other foreign countries were $176.4 million, $83.9 million, $75.7 million, $51.4 million and $102.5 million, respectively as of September 27, 2024, and $165.4 million, $84.3 million, $74.3 million, $54.3 million and $101.7 million, respectively as of December 29, 2023.

Organization and Significant _2

Organization and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation
Fiscal Year	Fiscal Year — The Company uses a 52-53 week fiscal year ending on the Friday nearest December 31. All references to quarters refer to fiscal quarters and all references to years refer to fiscal years.
Principles of Consolidation	Principles of Consolidation
Impairment Testing of Long-Lived Assets and Goodwill	Impairment Testing of Long-Lived Assets and Goodwill — In the second quarter of 2024, the Company conducted an interim impairment test of its long-lived assets and goodwill associated with its HIS Innovations Group (“HIS”) reporting unit due to the presence of an indicator of potential impairment. This indicator included lower-than-expected financial performance. The Company reviewed the HIS asset group’s long-lived assets for impairment by comparing the carrying value to the estimated undiscounted future cash flows expected to be generated by the assets. Based on this assessment, the Company determined that the estimated undiscounted future cash flows exceeded the carrying values of the long-lived assets. Consequently, no impairment loss was recognized in the period. The Company performed a quantitative assessment of goodwill for the HIS reporting unit using the income approach. The income approach involves estimating the future cash flows attributable and discounting these cash flows to their present value using an appropriate discount rate. The fair value of the reporting unit was then compared to its carrying amount, including goodwill. The results of this quantitative assessment indicated that the fair value of the reporting unit exceeded its carrying amount. As a result, the Company concluded that no impairment of goodwill was necessary.
Accounting Standards Recently Adopted and Accounting Standards Not Yet Adopted	Accounting Standards Recently Adopted The Company has not adopted any new accounting standards during the nine months ended September 27, 2024 that have a material impact on the Company’s condensed consolidated financial statements. Accounting Standards Not Yet Adopted In November 2023, FASB issued Accounting Standard Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. The Company is required to adopt this standard in the fiscal year 2024 for the annual reporting ending December 27, 2024, with retrospective disclosure of prior periods presented. The Company expects this ASU to only impact its disclosures with no impact to its results of operations, cash flows and financial condition. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which amends the guidance in ASC 740, Income Taxes. ASU No. 2023-09 is intended to improve the transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. It also includes certain other amendments to improve the effectiveness of income tax disclosures. The Company is required to adopt this standard prospectively in fiscal year 2025 for the annual reporting period ending December 26, 2025. The Company is currently evaluating the potential impact of adopting this new guidance on its consolidated financial statements and related disclosures.

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 27, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Summary of Preliminary Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest at Date of Acquisition	The following table summarizes the fair values of assets acquired and liabilities assumed at the date of acquisition, including all measurement period adjustments: (In millions) Amount Cash and cash equivalents $ 0.4 Accounts receivable 5.6 Inventories 11.4 Prepaid expenses and other assets 2.7 Property, plant and equipment 9.3 Purchased intangible assets 51.6 Operating lease right-of-use assets 7.5 Accounts payable (8.1) Accrued compensation and related benefits (0.7) Other current liabilities (0.9) Deferred tax liabilities (12.1) Operating lease liabilities (9.6) Total identifiable net assets $ 57.1 Goodwill $ 16.5
Summary of Purchased Intangible Assets	The following table summarizes the intangible assets acquired and the useful lives of these assets: Purchased Useful Intangible (In years) (In millions) Customer relationships 7 $ 35.2 IP knowhow 5 11.2 Developed technology 5 4.6 Backlog 1 0.6 Total purchased intangible assets $ 51.6

Balance Sheet Information (Tabl

Balance Sheet Information (Tables)	9 Months Ended
	Sep. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Inventories	Inventories consisted of the following: (In millions) September 27, December 29, Raw materials $ 205.5 $ 197.9 Work in process 133.9 107.2 Finished goods 63.2 69.4 Total $ 402.6 $ 374.5
Property, Plant and Equipment, Net	Property, plant and equipment, net, consisted of the following: (In millions) September 27, December 29, Land $ 2.2 $ 5.6 Buildings 57.0 57.1 Leasehold improvements 135.5 110.8 Machinery and equipment 220.2 207.4 Computer equipment and software 75.7 72.2 Furniture and fixtures 5.3 5.0 495.9 458.1 Accumulated depreciation (204.6) (170.3) Construction in progress 36.4 40.5 Total $ 327.7 $ 328.3

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 27, 2024
Fair Value Disclosures [Abstract]
Assets or Liabilities Measured at Fair Value	The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy: Fair Value Measurement at Description September 27, 2024 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In millions) Other non-current assets: Plan assets $ 0.5 $ — $ — $ 0.5 Other current liabilities: Forward contracts $ 0.5 $ — $ 0.5 $ — Other liabilities: Pension obligation $ 1.6 $ — $ — $ 1.6 Contingent earn-out $ 7.1 $ — $ — $ 7.1 Fair Value Measurement at Description December 29, 2023 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In millions) Other non-current assets: Plan assets $ 1.3 $ — $ — $ 1.3 Other current liabilities: Forward contracts $ 0.1 $ — $ 0.1 $ — Other liabilities: Pension obligation $ 1.6 $ — $ — $ 1.6 Contingent earn-out $ 29.1 $ — $ — $ 29.1

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 27, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Details of Goodwill	Details of aggregate goodwill of the Company are as follows: (In millions) Products Services Total Balance at September 27, 2024 $ 191.8 $ 73.5 $ 265.3
Purchased Intangible Assets	Details of intangible assets were as follows: As of September 27, 2024 As of December 29, 2023 (Dollars in millions) Useful Life Gross Accumulated Carrying Gross Accumulated Carrying Customer relationships 6 - 10 $ 207.2 $ (112.4) $ 94.8 $ 207.2 $ (97.5) $ 109.7 Recipes 20 73.2 (22.4) 50.8 73.2 (19.5) 53.7 Intellectual property/know-how 7 - 15 48.9 (21.7) 27.2 48.9 (18.4) 30.5 Tradename 4 - 6* 32.5 (22.7) 9.8 32.5 (22.1) 10.4 Standard operating procedures 20 8.6 (2.6) 6.0 8.6 (2.3) 6.3 Developed technology 5 4.6 (0.8) 3.8 4.6 (0.2) 4.4 Backlog 1 0.6 (0.6) — 0.6 (0.3) 0.3 Total $ 375.6 $ (183.2) $ 192.4 $ 375.6 $ (160.3) $ 215.3 *
Future Estimated Amortization Expense	As of September 27, 2024, future estimated amortization expense is expected to be as follows: (In millions) Amortization 2024 (remaining in year) $ 7.5 2025 28.1 2026 27.2 2027 26.9 2028 23.8 Thereafter 69.9 Total $ 183.4

Retirement Plans (Table)

Retirement Plans (Table)	9 Months Ended
	Sep. 27, 2024
Retirement Benefits [Abstract]
Schedule of Future Payment Obligations	As of September 27, 2024, the Company's future estimated payment obligations for the respective fiscal years are as follows: (In millions) 2024 $ 0.4 2025 1.7 2026 2.5 2027 1.4 2028 1.2 Thereafter 10.8 Total $ 18.0

Employee Stock Plans (Tables)

Employee Stock Plans (Tables)	9 Months Ended
	Sep. 27, 2024
Postemployment Benefits [Abstract]
Stock-Based Compensation Expense Included in Condensed Consolidated Statements of Operations	The following table shows the Company’s stock-based compensation expense included in the Condensed Consolidated Statements of Operations: Three Months Ended Nine Months Ended (In millions) September 27, September 29, September 27, September 29, Cost of revenues (1) $ 0.5 $ 0.3 $ 1.3 $ 0.9 Research and development 0.1 0.1 0.2 0.2 Sales and marketing 0.4 0.4 1.4 1.1 General and administrative 3.7 3.2 9.8 6.5 Total stock-based compensation $ 4.7 $ 4.0 $ 12.7 $ 8.7 (1)
Summary of Restricted Stock Unit, Performance Stock Units and Restricted Stock Award Activity	The following table summarizes the Company’s combined RSU, PSU and RSA activity for the nine months ended September 27, 2024: (In millions) Number of Aggregate Outstanding at December 29, 2023 1.4 $ 46.1 Granted 0.7 Vested (0.4) Forfeited (0.3) Outstanding at September 27, 2024 1.4 56.7 Expected to vest at September 27, 2024 1.4 $ 56.7

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 27, 2024
Revenue from Contract with Customer [Abstract]
Revenue by Geographic Area	The following table sets forth revenue by geographic area: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Singapore $ 173.9 $ 155.4 $ 500.0 $ 446.5 United States 145.6 125.8 432.7 393.7 China 56.7 26.7 171.2 80.8 Austria 48.9 33.1 131.6 94.9 South Korea 25.3 21.9 73.6 71.9 Taiwan 23.2 20.0 60.3 60.5 Others 66.8 52.1 164.9 141.5 Total $ 540.4 $ 435.0 $ 1,534.3 $ 1,289.8
Summary of the Most Significant Customers	The Company’s most significant customers (having individually accounted for 10% or more of revenues) and their related revenues as a percentage of total revenues were as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Lam Research Corporation 31.2 % 33.0 % 31.4 % 34.5 % Applied Materials, Inc. 21.8 25.7 22.4 22.9 Total 53.0 % 58.7 % 53.9 % 57.4 %

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Sep. 27, 2024
Earnings Per Share [Abstract]
Basic and Diluted Net Income Per Share	The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income (loss) per share: Three Months Ended Nine Months Ended (In millions, except share amounts) September 27, September 29, September 27, September 29, Numerator: Net income (loss) attributable to UCT $ (2.3) $ (14.5) $ 7.4 $ (27.3) Denominator: Shares used in computation — basic: Weighted average common shares outstanding 45.0 44.8 44.8 44.8 Shares used in computation — diluted: Weighted average common shares outstanding 45.0 44.8 44.8 44.8 Effect of potential dilutive securities: Employee stock plans — — 0.6 — Shares used in computing diluted net income (loss) per share 45.0 44.8 45.4 44.8 Net income (loss) per share attributable to UCT — basic $ (0.05) $ (0.32) $ 0.16 $ (0.61) Net income (loss) per share attributable to UCT — diluted $ (0.05) $ (0.32) $ 0.16 $ (0.61)

Reportable Segments (Tables)

Reportable Segments (Tables)	9 Months Ended
	Sep. 27, 2024
Segment Reporting [Abstract]
Summary of Segment Description and Data	The following table describes each reportable segment: Segment Product or Services Primary Markets Served Geographic Areas Products Assembly Semiconductor Americas Asia Pacific EMEA Services Cleaning Semiconductor Americas Asia Pacific EMEA Segment Data Three Months Ended Nine Months Ended (In millions) September 27, September 29, September 27, September 29, Revenues: Products $ 479.0 $ 380.9 $ 1,350.2 $ 1,112.0 Services 61.4 54.1 184.1 177.8 Total segment revenues $ 540.4 $ 435.0 $ 1,534.3 $ 1,289.8 Gross margin: Products $ 75.7 $ 51.6 $ 209.0 $ 156.5 Services 17.7 13.6 55.5 49.8 Total segment gross margin $ 93.4 $ 65.2 $ 264.5 $ 206.3 Income from operations: Products $ 22.4 $ 7.7 $ 55.9 $ 27.3 Services 2.8 (2.0) 9.4 3.4 Total segment income from operations $ 25.2 $ 5.7 $ 65.3 $ 30.7 (In millions) September 27, December 29, Assets Products $ 1,670.8 $ 1,617.5 Services 276.7 250.2 Total segment assets $ 1,947.5 $ 1,867.7

Business Combinations - Additio

Business Combinations - Additional Information (Details) - HIS Innovations Group - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 25, 2023	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Business Acquisition [Line Items]
Business acquisition percentage of voting interests acquired	100%
Total purchase consideration	$ 73.6
Cash consideration	46.5
Business acquisition fair value of potential earn-out payments	27.1
Business acquisition potential cash earn-out payments	$ 70
Acquisition related costs		$ 0.6	$ 0	$ 1	$ 0

Business Combinations - Summary

Business Combinations - Summary of Preliminary Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest at Date of Acquisition (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023	Oct. 25, 2023
Business Acquisition [Line Items]
Goodwill	$ 265.3	$ 265.2
HIS Innovations Group
Business Acquisition [Line Items]
Cash and cash equivalents			$ 0.4
Accounts receivable			5.6
Inventories			11.4
Prepaid expenses and other assets			2.7
Property, plant and equipment			9.3
Purchased intangible assets			51.6
Operating lease right-of-use assets			7.5
Accounts payable			(8.1)
Accrued compensation and related benefits			(0.7)
Other current liabilities			(0.9)
Deferred tax liabilities			(12.1)
Operating lease liabilities			(9.6)
Total identifiable net assets			57.1
Goodwill			$ 16.5

Business Combinations - Schedul

Business Combinations - Schedule of Total Purchased Intangible Assets (Details) - HIS Innovations Group $ in Millions	Oct. 25, 2023 USD ($)
Business Acquisition [Line Items]
Purchased intangible assets	$ 51.6
Customer relationships
Business Acquisition [Line Items]
Useful life	7 years
Purchased intangible assets	$ 35.2
Intellectual property/know-how
Business Acquisition [Line Items]
Useful life	5 years
Purchased intangible assets	$ 11.2
Developed technology
Business Acquisition [Line Items]
Useful life	5 years
Purchased intangible assets	$ 4.6
Backlog
Business Acquisition [Line Items]
Useful life	1 year
Purchased intangible assets	$ 0.6

Balance Sheet Information - Sum

Balance Sheet Information - Summary of Inventories (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 205.5	$ 197.9
Work in process	133.9	107.2
Finished goods	63.2	69.4
Total	$ 402.6	$ 374.5

Balance Sheet Information - Pro

Balance Sheet Information - Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Property, Plant and Equipment Line Items
Property, plant, and equipment, net, excluding construction in progress	$ 495.9	$ 458.1
Accumulated depreciation	(204.6)	(170.3)
Construction in progress	36.4	40.5
Total	327.7	328.3
Land
Property, Plant and Equipment Line Items
Equipment and leasehold improvements, gross	2.2	5.6
Buildings
Property, Plant and Equipment Line Items
Equipment and leasehold improvements, gross	57	57.1
Leasehold improvements
Property, Plant and Equipment Line Items
Equipment and leasehold improvements, gross	135.5	110.8
Machinery and equipment
Property, Plant and Equipment Line Items
Equipment and leasehold improvements, gross	220.2	207.4
Computer equipment and software
Property, Plant and Equipment Line Items
Equipment and leasehold improvements, gross	75.7	72.2
Furniture and fixtures
Property, Plant and Equipment Line Items
Equipment and leasehold improvements, gross	$ 5.3	$ 5

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value, Assets and Liabilities Measured (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Plan assets
Other non-current assets:
Plan assets	$ 0.5	$ 1.3
Forward contracts
Other current liabilities:
Forward contracts	0.5	0.1
Other liabilities:
Liabilities	0.5	0.1
Contingent earn-out
Other current liabilities:
Forward contracts	7.1	29.1
Other liabilities:
Liabilities	7.1	29.1
Pension obligation
Other current liabilities:
Forward contracts	1.6	1.6
Other liabilities:
Liabilities	1.6	1.6
Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan assets
Other non-current assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Forward contracts
Other current liabilities:
Forward contracts	0	0
Other liabilities:
Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent earn-out
Other current liabilities:
Forward contracts	0	0
Other liabilities:
Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension obligation
Other current liabilities:
Forward contracts	0	0
Other liabilities:
Liabilities	0	0
Significant Other Observable Inputs (Level 2) | Plan assets
Other non-current assets:
Plan assets	0	0
Significant Other Observable Inputs (Level 2) | Forward contracts
Other current liabilities:
Forward contracts	0.5	0.1
Other liabilities:
Liabilities	0.5	0.1
Significant Other Observable Inputs (Level 2) | Contingent earn-out
Other current liabilities:
Forward contracts	0	0
Other liabilities:
Liabilities	0	0
Significant Other Observable Inputs (Level 2) | Pension obligation
Other current liabilities:
Forward contracts	0	0
Other liabilities:
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Plan assets
Other non-current assets:
Plan assets	0.5	1.3
Significant Unobservable Inputs (Level 3) | Forward contracts
Other current liabilities:
Forward contracts	0	0
Other liabilities:
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Contingent earn-out
Other current liabilities:
Forward contracts	7.1	29.1
Other liabilities:
Liabilities	7.1	29.1
Significant Unobservable Inputs (Level 3) | Pension obligation
Other current liabilities:
Forward contracts	1.6	1.6
Other liabilities:
Liabilities	$ 1.6	$ 1.6

Fair Value - Additional Informa

Fair Value - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2024 USD ($)	Sep. 27, 2024 USD ($)
Fair Value Disclosures [Abstract]
Aggregate pension benefit obligations	$ 12.3	$ 12.3
Fair value of benefit plan assets	11.2	11.2
Unfunded balance of benefit plan	1.1	1.1
Gain from change in fair value of contingent earn-out	$ (0.8)	$ 22

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Finite Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0		$ 0
Goodwill additions	0		0
Amortization of intangible assets	$ 7,600,000	$ 5,500,000	22,900,000	$ 16,900,000
UCT Tradename
Finite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets acquired			$ 9,000,000

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Details of Goodwill (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Goodwill [Line Items]
Goodwill	$ 265.3	$ 265.2
Products
Goodwill [Line Items]
Goodwill	191.8
Services
Goodwill [Line Items]
Goodwill	$ 73.5

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2024	Dec. 29, 2023
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite and Indefinite-Lived	$ 375.6	$ 375.6
Accumulated Amortization	(183.2)	(160.3)
Carrying Value, Finite-Lived	183.4
Carrying Value, Finite And Indefinite-Lived	192.4	215.3
Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived	207.2	207.2
Accumulated Amortization	(112.4)	(97.5)
Carrying Value, Finite-Lived	$ 94.8	109.7
Customer relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	6 years
Customer relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	10 years
Recipes
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	20 years
Gross Carrying Amount, Finite-Lived	$ 73.2	73.2
Accumulated Amortization	(22.4)	(19.5)
Carrying Value, Finite-Lived	50.8	53.7
Intellectual property/know-how
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived	48.9	48.9
Accumulated Amortization	(21.7)	(18.4)
Carrying Value, Finite-Lived	$ 27.2	30.5
Intellectual property/know-how | Minimum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	7 years
Intellectual property/know-how | Maximum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	15 years
Tradename
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite and Indefinite-Lived	$ 32.5	32.5
Accumulated Amortization	(22.7)	(22.1)
Carrying Value, Finite And Indefinite-Lived	$ 9.8	10.4
Tradename | Minimum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	4 years
Tradename | Maximum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	6 years
Standard operating procedures
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	20 years
Gross Carrying Amount, Finite-Lived	$ 8.6	8.6
Accumulated Amortization	(2.6)	(2.3)
Carrying Value, Finite-Lived	$ 6	6.3
Developed technology
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	5 years
Gross Carrying Amount, Finite-Lived	$ 4.6	4.6
Accumulated Amortization	(0.8)	(0.2)
Carrying Value, Finite-Lived	$ 3.8	4.4
Backlog
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	1 year
Gross Carrying Amount, Finite-Lived	$ 0.6	0.6
Accumulated Amortization	(0.6)	(0.3)
Carrying Value, Finite-Lived	$ 0	$ 0.3

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Future Estimated Amortization Expense (Details) $ in Millions	Sep. 27, 2024 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2024 (remaining in year)	$ 7.5
2025	28.1
2026	27.2
2027	26.9
2028	23.8
Thereafter	69.9
Carrying Value, Finite-Lived	$ 183.4

Borrowing Arrangements - Additi

Borrowing Arrangements - Additional Information (Details) € in Millions, $ in Millions			3 Months Ended	9 Months Ended
	Apr. 04, 2024 USD ($)	Jun. 29, 2023	Sep. 27, 2024 USD ($)	Sep. 27, 2024 USD ($)	Sep. 29, 2023 USD ($)	Sep. 27, 2024 EUR (€)	Apr. 03, 2024 USD ($)
Debt Instrument [Line Items]
Proceeds from bank borrowings				$ 67.7	$ 0
Extinguishment of bank borrowings				44.2	$ 0
Amortization of debt issuance costs			$ 3.6	3.6
Bank Debt
Debt Instrument [Line Items]
Unamortized debt issuance costs			7.7	7.7
Total bank debt			$ 492.2	$ 492.2
Term Loan Credit Facility
Debt Instrument [Line Items]
Percentage of original outstanding principal balance as quarterly principal payment				0.625%
Term loan, interest rate			8.90%	8.90%		8.90%
Unamortized debt issuance costs			$ 7.7	$ 7.7
Term Loan Credit Facility | Eurodollar | Minimum
Debt Instrument [Line Items]
Debt instrument variable interest rate		3.25%
Term Loan Credit Facility | Eurodollar | Maximum
Debt Instrument [Line Items]
Debt instrument variable interest rate		3.50%
Term Loan Credit Facility | ABR | Minimum
Debt Instrument [Line Items]
Debt instrument variable interest rate		2.25%
Term Loan Credit Facility | ABR | Maximum
Debt Instrument [Line Items]
Debt instrument variable interest rate		2.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Initial available commitment			150	$ 150
Commitment fee percentage				0.25%
Remaining available commitments			146	$ 146
Outstanding amount under credit facility			4	4
Revolving Credit Facility | Bank Debt
Debt Instrument [Line Items]
Initial available commitment			7.8	7.8
Revolving Credit Facility | Czech Republic | Bank Debt
Debt Instrument [Line Items]
Initial available commitment | €						€ 7
Remaining available commitments			7.8	7.8
Revolving Credit Facility | United States | Bank Debt
Debt Instrument [Line Items]
Remaining available commitments			146	146
Revolving Credit Facility | Israel | Bank Debt
Debt Instrument [Line Items]
Remaining available commitments			4.9	4.9
Letter of Credit Facility
Debt Instrument [Line Items]
Initial available commitment			50	$ 50
Commitment fee percentage				2.50%
Remaining available commitments			46	$ 46
Outstanding amount under credit facility			4	$ 4
Percentage of undrawn and unexpired amount of letter of credit as fronting fee				0.125%
Fluid Solutions
Debt Instrument [Line Items]
Outstanding debt			6.1	$ 6.1
Initial available commitment			$ 11	$ 11
Average interest rate			7.10%	7.10%		7.10%
Secured Debt | Term Loan Credit Facility
Debt Instrument [Line Items]
Proceeds from bank borrowings	$ 67.7
Lender fees	1.1
Extinguishment of bank borrowings	44.2
Debt issuance costs	2.5
Deferred capitalize debt costs	$ 5.2
Secured Debt | Term Loan Credit Facility | Line of Credit
Debt Instrument [Line Items]
Extended maturity date period	30 months
Debt instrument, interest rate reduction	0.25%
Outstanding debt	$ 500		$ 493.8	$ 493.8			$ 475.4

Income Tax - Additional Informa

Income Tax - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Income Tax Disclosure [Abstract]
Effective tax rate	97.10%	(70.70%)	66%	(488.60%)
Income tax provision	$ 9.9	$ 5.3	$ 28.2	$ 17.1
Gross liability for unrecognized tax benefits, excluding interest	$ 3.1	$ 2.7	$ 3.1	$ 2.7

Retirement Plans - Additional I

Retirement Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Defined Contribution Plan Disclosure [Line Items]
Benefit obligations	$ 12.3		$ 12.3
Fair value of benefit plan assets	11.2		11.2
Unfunded balance of benefit plan	1.1		$ 1.1
Contributions by employer		$ 0.1		$ 0.1
Amounts recognized in accumulated other comprehensive loss		0.2		0.4
Maximum contribution from salary, percent			25%
Employer matching contribution, percent of match			50%
Discretionary employer contributions	$ 0.8	$ 0.9	$ 2.7	$ 2.5
Maximum
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay			6%

Retirement Plans - Schedule of

Retirement Plans - Schedule of Future Payment Obligations (Details) $ in Millions	Sep. 27, 2024 USD ($)
Retirement Benefits [Abstract]
2024	$ 0.4
2025	1.7
2026	2.5
2027	1.4
2028	1.2
Thereafter	10.8
Total	$ 18

Stockholders' Equity and Nonc_2

Stockholders' Equity and Noncontrolling Interests - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Oct. 20, 2022	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Business Acquisition [Line Items]
Shares repurchased, value					$ 23,700,000
Cinos Co Ltd [Member]
Business Acquisition [Line Items]
Percentage of value used for fair value of non-controlling interest estimates		100%		100%
Common Stock
Business Acquisition [Line Items]
Authorized amount	$ 150,000,000
Repurchase program, period	3 years
Number of shares repurchased		0	0	0	800,000
Shares repurchased, value					$ 23,700,000

Employee Stock Plans - Addition

Employee Stock Plans - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 29,400,000		$ 29,400,000
Estimated period of options amortization			1 year 10 months 24 days
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee common stock fair market value rate	85%
Number of shares of common stock issued under ESPP	0	0	42,000	0
Stock based compensation expense	$ 200,000	$ 200,000	$ 500,000	$ 300,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	27,000	14,000	502,000	567,000
Weighted average fair value, granted (in dollars per share)	$ 39.72	$ 32.55	$ 41.37	$ 28.41
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit purchase price of Restricted Stock Units			$ 0
Shares vesting period, years			3 years
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	125,000	145,000
Award performance period			3 years
Percentage expected target award range, minimum			0%
Percentage expected target award range, maximum			200%
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	26,000	37,000
Restricted Stock Awards | Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized expense of company's unvested restricted stock awards	$ 800,000		$ 800,000

Employee Stock Plans - Stock-Ba

Employee Stock Plans - Stock-Based Compensation Expense Included in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 4.7	$ 4	$ 12.7	$ 8.7
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	0.5	0.3	1.3	0.9
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	0.1	0.1	0.2	0.2
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	0.4	0.4	1.4	1.1
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 3.7	$ 3.2	$ 9.8	$ 6.5

Employee Stock Plans - Summary

Employee Stock Plans - Summary of Restricted Stock Unit, Performance Stock Units and Restricted Stock Award Activity (Details) - Restricted Stock Unit, Performance Stock Units and Restricted Stock Award shares in Millions, $ in Millions	9 Months Ended
	Sep. 27, 2024 USD ($) shares	Dec. 29, 2023 USD ($)
Number of Shares
Unvested restricted stock units and restricted stock awards, beginning balance (in shares)	1.4
Granted (in shares)	0.7
Vested (in shares)	(0.4)
Forfeited (in shares)	(0.3)
Unvested restricted stock units and restricted stock awards, ending balance (in shares)	1.4
Vested and expected to vest restricted stock units and restricted stock awards (in shares)	1.4
Unvested restricted stock units and restricted stock awards | $	$ 56.7	$ 46.1
Expected to vest at September 27, 2024 | $	$ 56.7

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions			9 Months Ended
	Sep. 27, 2024	Dec. 29, 2023	Sep. 27, 2024
Lam Research Corporation, ASML Holding NV, and Applied Materials, Inc. | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	35%
Lam Research Corporation, Applied Materials, Inc. | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration percentage		26.80%
Accounts Receivable
Concentration Risk [Line Items]
Unpaid customer rebates	$ 1.8	$ 2	$ 1.8
Maximum
Concentration Risk [Line Items]
Customer payment terms			60 days
Product warranty period (in years)			2 years
Minimum
Concentration Risk [Line Items]
Customer payment terms			30 days

Revenue Recognition - Summary o

Revenue Recognition - Summary of Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 540.4	$ 435	$ 1,534.3	$ 1,289.8
Singapore
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	173.9	155.4	500	446.5
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	145.6	125.8	432.7	393.7
China
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	56.7	26.7	171.2	80.8
Austria
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	48.9	33.1	131.6	94.9
South Korea
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	25.3	21.9	73.6	71.9
Taiwan
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	23.2	20	60.3	60.5
Others
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 66.8	$ 52.1	$ 164.9	$ 141.5

Revenue Recognition - Summary_2

Revenue Recognition - Summary of the Most Significant Customers (Details) - Sales - Customer Concentration Risk	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Lam Research Corporation
Concentration Risk [Line Items]
Total	31.20%	33%	31.40%	34.50%
Applied Materials, Inc.
Concentration Risk [Line Items]
Total	21.80%	25.70%	22.40%	22.90%
Total
Concentration Risk [Line Items]
Total	53%	58.70%	53.90%	57.40%

Leases (Details)

Leases (Details) - USD ($) $ in Millions	Sep. 27, 2024	Jul. 31, 2024	Mar. 29, 2024	Dec. 29, 2023
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 162.2			$ 151.7
Malaysia
Lessee, Lease, Description [Line Items]
Lease term		60 years
Operating lease right-of-use assets		$ 21.9
Lease liability		$ 16.8
Austin, Texas
Lessee, Lease, Description [Line Items]
Lease term			10 years
Renewal term			7 years
Czech Republic
Lessee, Lease, Description [Line Items]
Lease term			8 years

Net Income (Loss) Per Share - B

Net Income (Loss) Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Numerator:
Net income (loss) attributable to UCT	$ (2.3)	$ (14.5)	$ 7.4	$ (27.3)
Shares used in computation — basic:
Weighted average common shares outstanding (in shares)	45	44.8	44.8	44.8
Shares used in computation — diluted:
Weighted average common shares outstanding (in shares)	45	44.8	44.8	44.8
Effect of potential dilutive securities:
Employee stock plans (in shares)	0	0	0.6	0
Shares used in computing diluted net loss per share (in shares)	45	44.8	45.4	44.8
Net income (loss) per share attributable to UCT — basic (in dollars per share)	$ (0.05)	$ (0.32)	$ 0.16	$ (0.61)
Net income (loss) per share attributable to UCT — diluted (in dollars per share)	$ (0.05)	$ (0.32)	$ 0.16	$ (0.61)

Reportable Segments - Additiona

Reportable Segments - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 27, 2024 USD ($) segment	Dec. 29, 2023 USD ($)
Segment Reporting Information Line Items
Number of operating segments | segment	3
Number of reportable segments | segment	2
United States
Segment Reporting Information Line Items
Long-lived assets	$ 176.4	$ 165.4
Malaysia
Segment Reporting Information Line Items
Long-lived assets	83.9	84.3
Israel
Segment Reporting Information Line Items
Long-lived assets	75.7	74.3
South Korea
Segment Reporting Information Line Items
Long-lived assets	51.4	54.3
Other Foreign Countries
Segment Reporting Information Line Items
Long-lived assets	$ 102.5	$ 101.7

Reportable Segments - Summary o

Reportable Segments - Summary of Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023	Dec. 29, 2023
Revenues:
Total segment revenues	$ 540.4	$ 435	$ 1,534.3	$ 1,289.8
Gross margin:
Total segment gross margin	93.4	65.2	264.5	206.3
Operating profit:
Total segment income from operations	25.2	5.7	65.3	30.7
Assets
Total segment assets	1,947.5		1,947.5		$ 1,867.7
Products
Revenues:
Total segment revenues	479	380.9	1,350.2	1,112
Gross margin:
Total segment gross margin	75.7	51.6	209	156.5
Operating profit:
Total segment income from operations	22.4	7.7	55.9	27.3
Assets
Total segment assets	1,670.8		1,670.8		1,617.5
Services
Revenues:
Total segment revenues	61.4	54.1	184.1	177.8
Gross margin:
Total segment gross margin	17.7	13.6	55.5	49.8
Operating profit:
Total segment income from operations	2.8	$ (2)	9.4	$ 3.4
Assets
Total segment assets	$ 276.7		$ 276.7		$ 250.2