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Cash Overdrafts And Cash Equivalents (Narrative) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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Cash Overdrafts And Cash Equivalents [Abstract] |  |
Cash overdrafts included in accounts payable | $ 0 | $ 9,800,000

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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