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Contingencies (Details) (Indemnification Agreement [Member], USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Jun. 30, 2013
Executive Officers [Member] |
Loss Contingencies [Line Items] |
Period of employment | 18 months
Estimated potential payments | $ 2,503
Key Employees [Member] |
Loss Contingencies [Line Items] |
Number of individuals | 22
Period of employment | 18 months
Estimated potential payments | $ 1,600

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- Definition Loss Contingency, Number Of Individuals. + References No definition available. + Details
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Namespace Prefix: | alco_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant