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Description of Business and Basis of Presentation (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2014
Related Party Transaction [Line Items] |  |
Common Stock, Par or Stated Value Per Share | $ 1 us-gaap_CommonStockParOrStatedValuePerShare | $ 1 us-gaap_CommonStockParOrStatedValuePerShare
Land [Member] |  |
Related Party Transaction [Line Items] |  |
Area of land owned | 121,000 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |
Mineral Rights [Member] |  |
Related Party Transaction [Line Items] |  |
Area of land owned | 90,000 us-gaap_AreaOfRealEstateProperty / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MiningPropertiesAndMineralRightsMember |
Silver Nip Citrus Agreement [Member] |  |
Related Party Transaction [Line Items] |  |
Number of shares issuable | 923,257 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = alco_SilverNipCitrusAgreementMember |
Amount of indebtedness | $ 40,278,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = alco_SilverNipCitrusAgreementMember |
Other liabilities | 6,952,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = alco_SilverNipCitrusAgreementMember |
Book value of assets acquired | 65,739,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = alco_SilverNipCitrusAgreementMember |
Net assets acquired | 18,509,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = alco_SilverNipCitrusAgreementMember |
Professional and legal fees | $ 811,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = alco_SilverNipCitrusAgreementMember |
734 Agriculture [Member] |  |
Related Party Transaction [Line Items] |  |
Ownership interest in subsidiary | 51.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Silver Nip [Member] | 734 Agriculture [Member] |  |
Related Party Transaction [Line Items] |  |
Ownership interest in subsidiary | 74.89%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember |
Silver Nip [Member] | Mr Wilson [Member] |  |
Related Party Transaction [Line Items] |  |
Ownership interest in subsidiary | 5.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = alco_MrWilsonMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember |
Silver Nip [Member] | Rio Verde Ventures, LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Ownership interest in subsidiary | 20.11%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = alco_RioVerdeVenturesLlcMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember |

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