Document and Entity Information
| Document and Entity Information | May 09, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | Glatfelter Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0000041719 |
| Document Type | 8-K |
| Document Period End Date | May 9, 2022 |
| Entity Incorporation State Country Code | PA |
| Entity File Number | 001-03560 |
| Entity Tax Identification Number | 23-0628360 |
| Entity Address, Address Line One | 4350 Congress Street |
| Entity Address, Address Line Two | Suite 600 |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28209 |
| City Area Code | (704) |
| Local Phone Number | 885-2555 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock |
| Trading Symbol | GLT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |