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Deferred Gain on Sale - Schedule Of Deferred Gain On Sale (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Business Combinations [Abstract] |  |
Deferred gain on sale | $ 26,167 | $ 27,482
Annual guarantee payment, net | (1,239) | (1,042)
Total deferred gain on sale | $ 24,928 | $ 26,440

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- Definition Annual Guaranteed Payment, Net + References No definition available. + Details
Name: | alco_AnnualGuaranteedPaymentNet
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Deferred Gain On Sale + References No definition available. + Details
Name: | alco_DeferredGainOnSale
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total Deferred Gain On Sale + References No definition available. + Details
Name: | alco_TotalDeferredGainOnSale
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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