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Inventories - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Inventory Disclosure [Abstract] |  |  |  |  |  |
Proceeds from federal relief grants | $ 175,000 | $ 163,000 | $ 1,123,000 | $ 4,299,000 | $ 4,299,000 | $ 4,629,000
Insurance Expenses Incurred |  |  |  |  | $ 2,250,000 |

X
- Definition Insurance expenses incurred. + References No definition available. + Details
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Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds From Federal Relief Grants + References No definition available. + Details
Name: | alco_ProceedsFromFederalReliefGrants
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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