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Deferred Gain on Sale - Schedule of Estimated Payments of Post-Closing Agreement (Details) $ in Thousands | Sep. 30, 2018 USD ($)
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Business Combinations [Abstract] |
2019 | $ 2,871
2020 | 3,264
2021 | 3,681
2022 | 4,123
2023 | 4,572
Thereafter | 13,804
Total | $ 32,315

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- Definition Disposal Group, Post-Closing Agreement Future Minimum Payments Due, Next Twelve Months + References No definition available. + Details
Name: | alco_DisposalGroupPostClosingAgreementFutureMinimumPaymentsDueNextTwelveMonths
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disposal Group, Post-Closing Agreement Future Minimum Payments Due, Thereafter + References No definition available. + Details
Name: | alco_DisposalGroupPostClosingAgreementFutureMinimumPaymentsDueThereafter
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disposal Group, Post-Closing Agreement Future Minimum Payments Due, Total + References No definition available. + Details
Name: | alco_DisposalGroupPostClosingAgreementFutureMinimumPaymentsDueTotal
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disposal Group, Post-Closing Agreement Future Minimum Payments Due, in Five Years + References No definition available. + Details
Name: | alco_DisposalGroupPostClosingAgreementFutureMinimumPaymentsDueinFiveYears
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disposal Group, Post-Closing Agreement Future Minimum Payments Due, in Four Years + References No definition available. + Details
Name: | alco_DisposalGroupPostClosingAgreementFutureMinimumPaymentsDueinFourYears
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disposal Group, Post-Closing Agreement Future Minimum Payments Due, in Three Years + References No definition available. + Details
Name: | alco_DisposalGroupPostClosingAgreementFutureMinimumPaymentsDueinThreeYears
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disposal Group, Post-Closing Agreement Future Minimum Payments Due, in Two Years + References No definition available. + Details
Name: | alco_DisposalGroupPostClosingAgreementFutureMinimumPaymentsDueinTwoYears
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration