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Long-Term Debt (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2010 | Sep. 30, 2014 | Dec. 03, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total long-term debt | $ 210,011,000 us-gaap_LongTermDebt |  |  | $ 210,011,000 us-gaap_LongTermDebt |  |  | $ 61,640,000 us-gaap_LongTermDebt |
Capitalized loan origination fees |  | 2,834,000 us-gaap_DebtIssuanceCosts |  |  |  |  |  |
Minimum current ratio | 1.50 alco_DebtInstrumentCovenantMinimumCurrentRatio |  |  | 1.50 alco_DebtInstrumentCovenantMinimumCurrentRatio |  |  |  |
Minimum tangible net worth | 160,000,000 alco_DebtInstrumentCovenantMinimumTangibleNetWorth |  |  | 160,000,000 alco_DebtInstrumentCovenantMinimumTangibleNetWorth |  |  |  |
Maximum debt ratio | 0.625 us-gaap_RatioOfIndebtednessToNetCapital1 |  |  | 0.625 us-gaap_RatioOfIndebtednessToNetCapital1 |  |  |  |
Minimum debt coverage ratio | 1.10 alco_DebtInstrumentCovenantMinimumDebtCoverageRatio |  |  | 1.10 alco_DebtInstrumentCovenantMinimumDebtCoverageRatio |  |  |  |
(Gain) loss on extinguishment of debt | 17,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 585,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  | 964,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |
Annual increase in covenant, percentage |  |  |  | 10.00%alco_DebtInstrumentCovenantPercentageAnnualIncrease |  |  |  |
Maximum capital expenditures | 30,000,000 alco_DebtInstrumentCovenantMaximumCapitalExpenditures |  |  | 30,000,000 alco_DebtInstrumentCovenantMaximumCapitalExpenditures |  |  |  |
Rabo Agrifinance, Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Capitalized loan origination fees |  |  |  |  |  | 1,202,000 us-gaap_DebtIssuanceCosts / us-gaap_LineOfCreditFacilityAxis = alco_RaboAgrifinanceIncMember |  |
Write-off of debt issuance costs |  |  |  | 396,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_LineOfCreditFacilityAxis = alco_RaboAgrifinanceIncMember |  |  |  |
Unamortized debt issuance costs | 301,000 us-gaap_DeferredFinanceCostsNet / us-gaap_LineOfCreditFacilityAxis = alco_RaboAgrifinanceIncMember |  |  | 301,000 us-gaap_DeferredFinanceCostsNet / us-gaap_LineOfCreditFacilityAxis = alco_RaboAgrifinanceIncMember |  |  |  | 697,000 us-gaap_DeferredFinanceCostsNet / us-gaap_LineOfCreditFacilityAxis = alco_RaboAgrifinanceIncMember
Metropolitan Life Insurance Company and New England Life Insurance Company fixed rate term loans in the original principal amount of $125 million [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total long-term debt | 114,688,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_FixedRateTermLoanMember |  |  | 114,688,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_FixedRateTermLoanMember |  |  |  |
Fixed interest rate | 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = alco_FixedRateTermLoanMember |  |  | 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = alco_FixedRateTermLoanMember |  |  |  |
Periodic principal payment |  |  |  | 2,281,250 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = alco_FixedRateTermLoanMember |  |  |  |
Amount of prepayment without penalty | 8,750,000 alco_DebtInstrumentAmountOfPrepaymentWithoutPenalty / us-gaap_DebtInstrumentAxis = alco_FixedRateTermLoanMember |  |  | 8,750,000 alco_DebtInstrumentAmountOfPrepaymentWithoutPenalty / us-gaap_DebtInstrumentAxis = alco_FixedRateTermLoanMember |  |  |  |
Metropolitan Life Insurance Company and New England Life Insurance Company variable rate term loans in the original principal amounts of $57.5 million [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total long-term debt | 56,781,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_VariableRateTermLoanMember |  |  | 56,781,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_VariableRateTermLoanMember |  |  |  |
LIBOR spread |  |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_VariableRateTermLoanMember |  |  |  |
Metropolitan Life Insurance Company and New England Life Insurance Company revolving line of credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of credit facility | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = alco_MetropolitanLifeInsuranceCompanyAndNewEnglandLifeInsuranceCompanyRevolvingLineOfCreditMember |  |  | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = alco_MetropolitanLifeInsuranceCompanyAndNewEnglandLifeInsuranceCompanyRevolvingLineOfCreditMember |  |  |  |
Annual commitment fee |  |  |  | 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = alco_MetropolitanLifeInsuranceCompanyAndNewEnglandLifeInsuranceCompanyRevolvingLineOfCreditMember |  |  |  |
LIBOR spread |  |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_MetropolitanLifeInsuranceCompanyAndNewEnglandLifeInsuranceCompanyRevolvingLineOfCreditMember |  |  |  |
Working Capital Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of credit facility | 70,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember |  |  | 70,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember |  |  |  |
LIBOR spread |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember |  |  |  |
Letters of credit outstanding | 17,498,500 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember |  |  | 17,498,500 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember |  |  |  |
Working Capital Line of Credit [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of credit facility | 20,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember |  |  | 20,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember |  |  |  |
Rabo Agrifinance, Inc. variable rate term loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | 34,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = alco_RevolvingLineOfCreditMember |
LIBOR spread |  |  |  |  |  |  | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_RevolvingLineOfCreditMember |
Periodic principal payment |  |  |  |  |  |  | 500,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = alco_RevolvingLineOfCreditMember |
Rabo Agrifinance, Inc. revolving line of credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of credit facility | $ 60,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = alco_RaboAgrifinanceIncRevolvingLineOfCreditMember |  |  | $ 60,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = alco_RaboAgrifinanceIncRevolvingLineOfCreditMember |  |  |  |
Annual commitment fee |  |  |  |  |  |  | 0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = alco_RaboAgrifinanceIncRevolvingLineOfCreditMember |
LIBOR spread |  |  |  |  |  |  | 1.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_RaboAgrifinanceIncRevolvingLineOfCreditMember |
Minimum [Member] | Working Capital Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual commitment fee |  |  |  | 0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
LIBOR spread |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Minimum [Member] | Rabo Agrifinance, Inc. revolving line of credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
LIBOR spread |  |  |  |  |  |  | 1.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_RaboAgrifinanceIncRevolvingLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] | Working Capital Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual commitment fee |  |  |  | 0.30%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
LIBOR spread |  |  |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_WorkingCapitalLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Maximum [Member] | Rabo Agrifinance, Inc. revolving line of credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
LIBOR spread |  |  |  |  |  |  | 2.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = alco_RaboAgrifinanceIncRevolvingLineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Citrus Groves [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Acres collateralized | 38,700 alco_DebtInstrumentCollateralPropertyAcreage / alco_LongTermDebtCollateralTypeAxis = alco_CitrusGrovesMember |  |  | 38,700 alco_DebtInstrumentCollateralPropertyAcreage / alco_LongTermDebtCollateralTypeAxis = alco_CitrusGrovesMember |  |  |  |
Farmland [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Acres collateralized | 14,000 alco_DebtInstrumentCollateralPropertyAcreage / alco_LongTermDebtCollateralTypeAxis = alco_FarmlandMember |  |  | 14,000 alco_DebtInstrumentCollateralPropertyAcreage / alco_LongTermDebtCollateralTypeAxis = alco_FarmlandMember |  |  |  |

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