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Orange-Co Acquisition (Schedule of Pro-Forma Information) (Details) (Orange-Co Acquisition [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Orange-Co Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 55,122 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 66,326 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 71,828 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 89,856 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember
Income from operations | 6,698 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | 17,073 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | 3,865 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | 17,641 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember
Net income attributable to common shareholder | $ 2,794 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 9,902 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 10,065 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 9,435 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember
Basic earnings per common share | $ 0.34 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 1.35 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 1.29 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 1.29 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember
Diluted earnings per common share | $ 0.34 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 1.35 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 1.29 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember | $ 1.28 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = alco_OrangeCoAcquisitionMember

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