| Document and Entity Information | Nov. 09, 2020 |
| Document and Entity Information [Abstract] | |
| Entity Central Index Key | 0000031107 |
| Amendment Flag | false |
| Document Type | 8-K |
| Document Period End Date | Nov. 9, 2020 |
| Entity Registrant Name | Eastern Co |
| Entity Incorporation, State or Country Code | CT |
| Entity File Number | 001-35383 |
| Entity Tax Identification Number | 06-0330020 |
| Entity Address, Address Line One | 112 Bridge Street |
| Entity Address, City or Town | Naugatuck |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06770 |
| City Area Code | 203 |
| Local Phone Number | 729-2255 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
