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Assets Held for Sale (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 | Nov. 21, 2014 acre
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Assets held for sale | $ 1,509,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets |  | $ 1,509,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets |  |  |  |
Sales price |  |  |  |  | 1,509,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds |  |
Gain (loss) on sale of real estate | (116,000)us-gaap_GainsLossesOnSalesOfInvestmentRealEstate | (1,000)us-gaap_GainsLossesOnSalesOfInvestmentRealEstate | 16,424,000 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate | (1,000)us-gaap_GainsLossesOnSalesOfInvestmentRealEstate |  |  |
Deferred gain on sale | 29,140,000 us-gaap_DeferredGainOnSaleOfProperty |  | 29,140,000 us-gaap_DeferredGainOnSaleOfProperty |  |  |  |
Asset impairment | (541,000)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  | (541,000)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |  |  |
Land and Land improvements [Member] |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Assets held for sale | 2,050,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_CitrusLandAndLandImprovementsMember |  | 2,050,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_CitrusLandAndLandImprovementsMember |  |  |  |
Asset impairment |  |  | (541,000)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_CitrusLandAndLandImprovementsMember |  |  |  |
Hendry County Sugarcane Property [Member] |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Acres held for sale |  |  |  |  |  |  | 36,000 alco_LongLivedAssetsHeldForSaleAcresOfLand / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_HendryCountySugarcanePropertyMember
Sales price |  |  |  |  |  |  | 97,913,921 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_HendryCountySugarcanePropertyMember
Proceeds deposited with intermediary |  |  | 97,126,000 us-gaap_PaymentsForDelayedTaxExemptExchange / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_HendryCountySugarcanePropertyMember |  |  |  |
Realized gain on disposal |  |  | 42,753,000 alco_DisposalGroupNotDiscontinuedOperationRealizedGainLossOnDisposal / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_HendryCountySugarcanePropertyMember |  |  |  |
Gain (loss) on sale of real estate |  |  | 13,613,000 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_HendryCountySugarcanePropertyMember |  |  |  |
Deferred gain on sale |  |  |  |  |  |  | $ 29,140,000 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_HendryCountySugarcanePropertyMember
Hendry County Sugarcane Property [Member] | Property Subject to Operating Lease [Member] |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Acres held for sale |  |  |  |  |  |  | 30,600 alco_LongLivedAssetsHeldForSaleAcresOfLand / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = alco_HendryCountySugarcanePropertyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember

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- Definition Amount before tax of gain (loss) realized on the sale or disposal of a disposal group. Excludes discontinued operations. + References No definition available. + Details
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- Definition Long Lived Assets Held For Sale, Acres Of Land. + References No definition available. + Details
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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.U.Q2) -URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791 + Details
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- Definition Amount classified as long lived assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Subparagraph d -Article 9 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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- Definition Cash outflow related to a property which is traded for the promise to provide a replacement like-kind property in the near future also known as a tax deferred exempt exchange. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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