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Property and Equipment, Net - Polk County Property Sale (Details) - Polk County Real Estate Parcel $ in Thousands | Jul. 01, 2014 USD ($) a
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Significant Acquisitions and Disposals [Line Items] |
Area of land owned (in acres) | a | 2,800
Cost of land | $ | $ 5,623

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=alco_PolkCountyRealEstateParcelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |