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Segment Information - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2015 segment | Sep. 30, 2017 classification segment | Sep. 30, 2015 segment
Property, Plant and Equipment [Line Items] |  |  |
Number of operating segments | segment | 3 | 3 | 3
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of primary classifications | classification |  | 2 |

X
- Definition Property, Plant and Equipment, Number of Classifications + References No definition available. + Details
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Namespace Prefix: | alco_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |