| Cover - shares | 3 Months Ended | |
| Mar. 29, 2024 | Jan. 24, 2025 | |
| Cover [Abstract] | ||
| Document Type | 10-Q/A | |
| Document Quarterly Report | true | |
| Document Period End Date | Mar. 29, 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 | 45,129,294 | |
| Amendment Flag | false | |
| Document Fiscal Year Focus | 2024 | |
| Document Fiscal Period Focus | Q1 | |
| Entity Central Index Key | 0001275014 | |
| Current Fiscal Year End Date | --12-27 |
| Insider Trading Arrangements | 3 Months Ended |
| Mar. 29, 2024 shares | |
| Trading Arrangements, by Individual | |
| Non-Rule 10b5-1 Arrangement Adopted | false |
| Rule 10b5-1 Arrangement Terminated | false |
| Non-Rule 10b5-1 Arrangement Terminated | false |
| James P. Scholhamer [Member] | |
| Trading Arrangements, by Individual | |
| Material Terms of Trading Arrangement | On March 8, 2024, James P. Scholhamer, the Company’s Chief Executive Officer, entered into a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. Mr. Scholhamer’s plan provides for the sale from time to time of up to 90,268 shares of the Company’s common stock, subject to certain minimum price thresholds. Mr. Scholhamer’s trading plan is scheduled to terminate on March 7, 2025, subject to early termination. |
| Name | James P. Scholhamer |
| Title | Chief Executive Officer |
| Rule 10b5-1 Arrangement Adopted | true |
| Adoption Date | March 8, 2024 |
| Expiration Date | March 7, 2025 |
| Arrangement Duration | 464 days |
| Aggregate Available | 90,268 |
| Sheri Savage [Member] | |
| Trading Arrangements, by Individual | |
| Material Terms of Trading Arrangement | On March 8, 2024, Sheri Savage, the Company’s Chief Financial Officer, entered into a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. Ms. Savage’s plan provides for the sale from time to time of, subject to certain minimum price thresholds: (i) up to 41,125 shares of the Company’s common stock held outright; and (ii) the additional sale of (net) shares of the Company’s common stock received upon the vesting, if any, of 22,111 (gross) shares of the Company’s common stock upon satisfaction of applicable service based and/or performance based vesting criteria, of restricted stock units and performance stock units, after giving effect to tax withholdings. Ms. Savage’s trading plan is scheduled to terminate on August 29, 2025, subject to early termination. |
| Name | Sheri Savage |
| Title | Chief Financial Officer |
| Rule 10b5-1 Arrangement Adopted | true |
| Adoption Date | March 8, 2024 |
| Expiration Date | August 29, 2025 |
| Arrangement Duration | 539 days |
| Aggregate Available | 41,125 |
