| Document And Entity Information | Oct. 29, 2019 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 29, 2019 |
| Entity Registrant Name | CHEMED CORPORATION |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-8351 |
| Entity Tax Identification Number | 31-0791746 |
| Entity Address, Address Line One | 2600 First Financial Center, 255 East 5th Street |
| Entity Address, City or Town | Cincinnati |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 45202 |
| City Area Code | 513 |
| Local Phone Number | 762-6690 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Capital stock $1 par value |
| Trading Symbol | CHE |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000019584 |
| Amendment Flag | false |
