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v2.4.1.9

Property, Buildings and Equipment, Net (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Apr. 03, 2015 | Sep. 30, 2014 | Sep. 04, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Net property, buildings and equipment | $ 383,446,000 us-gaap_PropertyPlantAndEquipmentNet |  | $ 383,446,000 us-gaap_PropertyPlantAndEquipmentNet |  |  | $ 126,833,000 us-gaap_PropertyPlantAndEquipmentNet |
Impairment on assets held for sale | 541,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  | 541,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |  |  |
Sales price |  |  |  |  | 1,509,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds |  |
Long-term debt | 210,011,000 us-gaap_LongTermDebt |  | 210,011,000 us-gaap_LongTermDebt |  |  | 61,640,000 us-gaap_LongTermDebt |
Citrus, Land and Land improvements [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment on assets held for sale |  |  | 541,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_CitrusLandAndLandImprovementsMember |  |  |  |
Silver Nip [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 11,000,000 us-gaap_LongTermDebt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember
Depreciable Property Plant and Equipment [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gross property, buildings and equipment | 332,597,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |  | 332,597,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |  |  | 150,192,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |
Less accumulated depreciation and depletion | (72,158,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |  | (72,158,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |  |  | (63,031,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |
Net property, buildings and equipment | 260,439,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |  | 260,439,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |  |  | 87,161,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_DepreciablePropertyPlantAndEquipmentMember |
Breeding herd [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gross property, buildings and equipment | 10,897,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BreedingAndProductionAnimalsMember |  | 10,897,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BreedingAndProductionAnimalsMember |  |  | 11,558,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BreedingAndProductionAnimalsMember |
Buildings [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gross property, buildings and equipment | 21,010,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  | 21,010,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  |  | 16,052,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |
Citrus trees [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gross property, buildings and equipment | 242,278,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_CitrusTreesMember |  | 242,278,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_CitrusTreesMember |  |  | 66,886,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = alco_CitrusTreesMember |
Equipment and Other Facilities [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gross property, buildings and equipment | 58,412,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember |  | 58,412,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember |  |  | 55,696,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember |
Land and Land Improvements [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gross property, buildings and equipment | 123,007,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember |  | 123,007,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember |  |  | 39,672,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember |
Land and Land Improvements [Member] | Silver Nip [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Area of land acquired |  |  |  |  |  |  | 1,500 alco_SignificantAcquisitionsAndDisposalsAreaOfLand / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember
Sales price |  |  |  |  |  |  | 17,600,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember
Land and Land Improvements [Member] | Silver Nip [Member] | Citrus, Land and Land improvements [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gross property, buildings and equipment |  |  |  |  |  | 2,832,159 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_CitrusLandAndLandImprovementsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember |
Pre-tax gains on sale of properties |  |  | $ 2,926,553 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_CitrusLandAndLandImprovementsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = alco_SilverNipMember |  |  |  |

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