Document And Entity Information	9 Months Ended
	Sep. 30, 2020 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	1-8351
Entity Registrant Name	CHEMED CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	31-0791746
Entity Address, Address Line One	255 E. Fifth Street
Entity Address, Address Line Two	Suite 2600
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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Capital Stock $1 Par Value
Trading Symbol	CHE
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding	15,951,822
Amendment Flag	false
Entity Central Index Key	0000019584
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020