| Document and Entity Information | Nov. 02, 2022 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | MAGNACHIP SEMICONDUCTOR Corp |
| Entity Address, Country | LU |
| Amendment Flag | true |
| Entity Central Index Key | 0001325702 |
| Document Type | 8-K/A |
| Document Period End Date | Nov. 02, 2022 |
| 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, Address Line Two | 1, Allée Scheffer |
| Entity Address, Postal Zip Code | L-2520 |
| Entity Address, City or Town | Luxembourg |
| 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 |
| Entity Emerging Growth Company | false |
| Amendment Description | On November 2, 2022, Magnachip Semiconductor Corporation (the “Company”) filed a Current Report on Form 8-K (the “Original Form 8-K”), under Items 2.02 and 9.01, related to financial information for the Company and its consolidated subsidiaries for the third quarter ended September 30, 2022, as presented in a press release dated November 2, 2022. Subsequent to the furnishing of the press release on the Original Form 8-K, the Company identified a scrivener’s error in the Non-GAAP reconciliation tables attached to the press release for Adjusted Net Income per common share (basic and diluted) for the nine month period ended September 30, 2021, which should have been $0.82 and $0.78 per share, respectively, consistent with the Company’s prior reports for that historical period. No other amounts or information reported in the Original Form 8-K and press release were changed. The Company issued a revised version of the press release on November 4, 2022 to correct such information. Accordingly, the Company is filing this Form 8-K/A to furnish a copy of the corrected version of the press release as Exhibit 99.1 hereto. |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | MX |
| Security Exchange Name | NYSE |
| Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Preferred Stock Purchase Rights |
| Security Exchange Name | NYSE |
