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Assets held for sale - Purchase and Sale Agreement (Details) - Global a in Thousands, $ in Millions | Nov. 21, 2014 USD ($) a
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Long Lived Assets Held-for-sale [Line Items] |
Land held for sale (in acres) | a | 36
Cost of land | $ | $ 97.9

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- Definition Long Lived Assets Held For Sale, Acres Of Land. + References No definition available. + Details
Name: | alco_LongLivedAssetsHeldForSaleAcresOfLand
Namespace Prefix: | alco_
Data Type: | num:areaItemType
Balance Type: | na
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_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=alco_HendryCountySugarcanePropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |