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Cash Overdrafts And Cash Equivalents (Narrative) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Cash Overdrafts And Cash Equivalents [Abstract]
Cash overdrafts included in accounts payable	$ 0	$ 0

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- Definition

Cash overdraft payable included in accounts payable.

+ References

No definition available.

+ Details

Name:	che_CashOverdraftPayableIncludedInAccountsPayable
Namespace Prefix:	che_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration