Estimate of obligations due Medicare upon demand due to overages for the inpatient cap and/or overall payment cap.

No definition available.

Name:	amed_EstimatedAmountDueBackToMedicareInOtherAccruedLiabilities
Namespace Prefix:	amed_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Historical collection rate from Medicare.

+ References

No definition available.

+ Details

Name:	amed_HistoricalCollectionRateFromMedicare
Namespace Prefix:	amed_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description containing the percentage of the entity's Hospice net Medicare service revenue that is derived from routine care.

+ References

No definition available.

+ Details

Name:	amed_HospiceMedicareRevenueRateAccountedForRoutineCare
Namespace Prefix:	amed_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description containing the visit threshold for a low utilization payment adjustment.

+ References

No definition available.

+ Details

Name:	amed_LowUtilizationPaymentAdjustmentNumberOfVisits
Namespace Prefix:	amed_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Description containing the number of days from the date the request for anticipated payment was received in which the final bill must be submitted to Medicare.

+ References

No definition available.

+ Details

Name:	amed_NetServiceRevenueEpisodePaymentRateDuration
Namespace Prefix:	amed_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Description containing the number of days from the date the request for anticipated payment was received in which the final bill must be submitted to Medicare.

+ References

No definition available.

+ Details

Name:	amed_NetServiceRevenuePeriodOfCarePaymentRateDuration
Namespace Prefix:	amed_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Non-Medicare Revenue Term Rates as a percentage of Medicare Term Rates

+ References

No definition available.

+ Details

Name:	amed_NonMedicareRevenueTermRates
Namespace Prefix:	amed_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage at which total reimbursement is capped if cost of care is unusually costly.

+ References

No definition available.

+ Details

Name:	amed_PercentageOfTotalReimbursementOfOutlierPayment
Namespace Prefix:	amed_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description containing the percentage of estimated payment that is requested at the start of care for an initial period of care.

+ References

No definition available.

+ Details

Name:	amed_RateOfRequestForAnticipatedPaymentSubmittedForInitialPeriodOfCare
Namespace Prefix:	amed_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=amed_HospiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=amed_HighAcuityCareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	amed_CapYearAxis=amed_CapYearTwoThousandFourteenThroughTwoThousandTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ProductConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=amed_MedicareRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=amed_AseraCareHospiceMember
Namespace Prefix:
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Balance Type:
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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020	Sep. 30, 2021 USD ($) visit	Sep. 30, 2020	Dec. 31, 2020 USD ($)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net service revenue period of care payment rate (days)			30 days
Percentage of total reimbursement of outlier payment			10.00%
Historical collection rate from Medicare			99.00%
Hospice Medicare revenue rate accounted for routine care	97.00%	97.00%	97.00%	97.00%
Net service revenue episode payment rate			60 days
Rate of request for anticipated payment submitted for the initial episode of care					20.00%
Home Health [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Historical collection rate from Medicare			99.00%
Home Health [Member] \| Minimum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Low utilization payment adjustment, maximum number of visits \| visit			2
Non-Medicare revenue term rates			95.00%
Home Health [Member] \| Maximum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Low utilization payment adjustment, maximum number of visits \| visit			6
Non-Medicare revenue term rates			100.00%
Hospice [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Historical collection rate from Medicare			99.00%
High Acuity Care \| Minimum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net service revenue episode payment rate			30 days
High Acuity Care \| Maximum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net service revenue episode payment rate			60 days
Cap Year 2014 Through 2021
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Estimated amounts due back to Medicare					$ 9.3
Cap Year 2016 Through 2021
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Estimated amounts due back to Medicare	$ 8.6		$ 8.6
Product Concentration Risk \| Revenue from Contract with Customer [Member] \| Medicare Revenue [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Percent of net services revenue	75.00%	76.00%	75.00%	75.00%
AseraCare Hospice [Member] \| Cap Year 2016 Through 2021
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Estimated amounts due back to Medicare	$ 2.5		$ 2.5