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Commitments and Contingencies - Legal Proceedings (Details) - Alico Settlement Agreement - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 11, 2019 | Sep. 30, 2019
Loss Contingencies [Line Items] |  |
Gain contingency, annual consulting fee, term (up to) | 24 months |
Gain contingency, annual consulting fee | $ 400 |
Amount of expense recorded |  | $ 800

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- Definition Gain Contingency, Annual Consulting Fee + References No definition available. + Details
Name: | alco_GainContingencyAnnualConsultingFee
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain Contingency, Consulting Fee Agreement, Term + References No definition available. + Details
Name: | alco_GainContingencyConsultingFeeAgreementTerm
Namespace Prefix: | alco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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