| Document and Entity Information | Dec. 21, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | MAGNACHIP SEMICONDUCTOR Corp |
| Amendment Flag | true |
| Entity Central Index Key | 0001325702 |
| Document Type | 8-K/A |
| Document Period End Date | Dec. 21, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-34791 |
| Entity Tax Identification Number | 83-0406195 |
| Entity Address, Address Line One | c/o MagnaChip Semiconductor S.A. |
| Entity Address, City or Town | Allée Scheffer |
| Entity Address, Postal Zip Code | L-2520 |
| Entity Address, Country | LU |
| City Area Code | (352) |
| Local Phone Number | 45-62-62 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | MX |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Description | This Form 8-K/A is being filed by Magnachip Semiconductor Corporation (the “Company”) to (i) correct a typographical error in the expected final settlement date of the ASR Agreement (as defined below) as stated in the original Form 8-K filed on December 21, 2022, and (ii) attach a copy of a revised press release issued by the Company to correct the same typographical error in the expected final settlement date of the ASR Agreement as stated in the press release attached as Exhibit 99.1 to the original Form 8-K. All other information in the original Form 8-K remains the same. |
