| Document and Entity Information | Dec. 21, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | Kraton Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001321646 |
| Document Type | 8-K |
| Document Period End Date | Dec. 21, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-34581 |
| Entity Tax Identification Number | 20-0411521 |
| Entity Address, Address Line One | 15710 John F. Kennedy Blvd. |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77032 |
| City Area Code | (281) |
| Local Phone Number | 504-4700 |
| 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 |
| Trading Symbol | KRA |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
