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Property, Buildings and Equipment, Net (Narrative) (Details) (Polk County Real Estate [Member]) | Jun. 30, 2014 acre
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Polk County Real Estate [Member] |
Long Lived Assets Held-for-sale [Line Items] |
Acres held for sale | 3,200

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