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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 27, 2024
Feb. 21, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 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, $0.001 par value    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 2,169.4
Entity Common Stock, Shares Outstanding   45,132,298  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement to be delivered to stockholders in connection with the December 27, 2024 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 27, 2024.
    
Entity Central Index Key 0001275014    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Trading Symbol UCTT    
Current Fiscal Year End Date --12-27