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Commitments and Contingencies - Change in Control Agreements (Details) - CIC Agreements - employee | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2014
Loss Contingencies [Line Items] |  |
Period of the change in control | 18 months |
CIC Recipients |  |
Loss Contingencies [Line Items] |  |
Number of key employees |  | 22

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- Definition Loss Contingency, Number Of Individuals. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Loss Contingency, Threshold Period Of Employment. + References No definition available. + Details
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Namespace Prefix: | alco_
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |