| Document and Entity Information | Nov. 19, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Current Report on Form 8‑K/A (the “Amendment”) amends the Current Report on Form 8‑K filed by Ichor Holdings, Ltd. (the “Company”) with the Securities and Exchange Commission (the “Commission”) on November 26, 2021 (the “Initial Form 8‑K”) regarding the acquisition by Ichor Systems, Inc., a wholly-owned subsidiary of the Company, of IMG Companies, LLC (“IMG”). This Amendment amends the Initial Form 8‑K to file the financial statements of the business acquired under Item 9.01(a) and pro forma financial information under Item 9.01(b), which are filed as exhibits hereto. This Amendment should be read in conjunction with the Initial Form 8‑K and the Company’s other filings with the Commission. Except as provided herein, all information in the Initial Form 8‑K remains unchanged. |
| Document Period End Date | Nov. 19, 2021 |
| Entity Registrant Name | ICHOR HOLDINGS, LTD. |
| Entity Central Index Key | 0001652535 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-37961 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address, Address Line One | 3185 Laurelview Ct. |
| Entity Address, City or Town | Fremont |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94538 |
| City Area Code | 510 |
| Local Phone Number | 897-5200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Ordinary Shares, par value $0.0001 |
| Trading Symbol | ICHR |
| Security Exchange Name | NASDAQ |
