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Summary of Significant Accounting Policies - Real Estate (Details) | 12 Months Ended
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Sep. 30, 2017
Minimum |
Real Estate Properties [Line Items] |
Percentage of sales price (at least) | 20.00%
Maximum |
Real Estate Properties [Line Items] |
Percentage of sales price (at least) | 25.00%

X
- Definition Revenue Recognition, Payments Received as a Percent Of Sales Price. + References No definition available. + Details
Name: | alco_RevenueRecognitionPaymentsReceivedPercentOfSalesPrice
Namespace Prefix: | alco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |