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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2022
Feb. 23, 2023
Jul. 01, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 30, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Trading Symbol UCTT    
Entity Registrant Name Ultra Clean Holdings, Inc.    
Entity Central Index Key 0001275014    
Current Fiscal Year End Date --12-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Common Stock, Shares Outstanding   44,786,140  
Entity Public Float     $ 1,205.2
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, $0.001 par value    
Security Exchange Name NASDAQ    
Entity File Number 000-50646    
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    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement to be delivered to stockholders in connection with the December 30, 2022 annual meeting of stockholders are incorporated by reference in Part III of this Form 10-K where indicated. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 30, 2022.

    
Auditor Firm ID 659    
Auditor Name Moss Adams LLP    
Auditor Location Seattle, WA United States