XML 100 R68.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Common Control Acquisition - Narrative (Details) | 12 Months Ended
--- | ---
Sep. 30, 2015 a county
Business Acquisition [Line Items] |
Number of Florida counties | county | 6
Silver Nip Citrus |
Business Acquisition [Line Items] |
Area of land owned (in acres) | a | 7,400

X
- Definition Number of Florida Counties + References No definition available. + Details
Name: | alco_NumberofFloridaCounties
Namespace Prefix: | alco_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

X
- Details
Name: | dei_LegalEntityAxis=alco_SilverNipCitrusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |