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Long-Term Debt (Silver Nip Citrus Debt) (Details) (USD $) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 04, 2014 acre
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 210,011,000 us-gaap_LongTermDebt | $ 61,640,000 us-gaap_LongTermDebt |  |
Minimum current ratio | 1.50 alco_DebtInstrumentCovenantMinimumCurrentRatio |  |  |
Long-term Line of Credit | 21,975,000 us-gaap_LineOfCredit | 3,160,000 us-gaap_LineOfCredit |  |
Prudential Mortgage Capital Company, LLC fixed rate term loans (5.35%) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 26,970,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoans5Point35Member | 27,550,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoans5Point35Member | 27,550,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoans5Point35Member |
Periodic principal payment | 290,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoans5Point35Member |  |  |
Amount of prepayment without penalty | 5,000,000 alco_DebtInstrumentAmountOfPrepaymentWithoutPenalty / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoans5Point35Member |  |  |
Fixed interest rate | 5.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoans5Point35Member |  |  |
Prudential Mortgage Capital Company, LLC fixed rate term loan (3.85%) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 5,500,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoan3Point85Member |  |  |
Periodic principal payment | 55,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoan3Point85Member |  |  |
Fixed interest rate | 3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoan3Point85Member |  |  |
Area of land acquired |  |  |  | 1,500 alco_SignificantAcquisitionsAndDisposalsAreaOfLand / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoan3Point85Member
Prudential Mortgage Capital Company, LLC fixed rate term loan (3.45%) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 5,500,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoan3Point45Member |  |  |
Periodic principal payment | 55,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoan3Point45Member |  |  |
Fixed interest rate | 3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcFixedRateTermLoan3Point45Member |  |  |
Prudential Mortgage Capital Company, LLC revolving line of credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of credit facility | 6,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcRevolvingLineOfCreditMember |  |  |
LIBOR spread | 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcRevolvingLineOfCreditMember |  |  |
Minimum current ratio | 2.00 alco_DebtInstrumentCovenantMinimumCurrentRatio / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcRevolvingLineOfCreditMember |  |  |
Long-term Line of Credit | $ 5,736,000 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcRevolvingLineOfCreditMember | $ 3,160,000 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcRevolvingLineOfCreditMember | $ 3,160,000 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = alco_PrudentialMortgageCapitalCompanyLlcRevolvingLineOfCreditMember |

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- Definition Debt Instrument, Amount Of Prepayment Without Penalty. + References No definition available. + Details
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- Definition Debt Instrument, Covenant Minimum Current Ratio. + References No definition available. + Details
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- Definition Significant Acquisitions And Disposals, Area Of Land. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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