| Document and Entity Information | Jan. 14, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Jan. 14, 2021 |
| Entity File Number | 1-9852 |
| Entity Registrant Name | CHASE CORPORATION |
| Entity Incorporation, State or Country Code | MA |
| Entity Tax Identification Number | 11-1797126 |
| Entity Address, Address Line One | 295 University Avenue |
| Entity Address, City or Town | Westwood |
| Entity Address State Or Province | MA |
| Entity Address, Postal Zip Code | 02090 |
| City Area Code | 781 |
| Local Phone Number | 332-0700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, $.10 par value |
| Trading Symbol | CCF |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000830524 |
| Amendment Flag | false |
