XML 27 R40.htm IDEA: XBRL DOCUMENT
v3.20.1

Inventories - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Inventory [Line Items] |  |  |  |
Proceeds received from insurance relating to property and casualty damage claims |  |  | $ 486 |
Proceeds from federal relief grants | $ 15,597 | $ 4,629 |  |
Property and Casualty Claims |  |  |  |
Inventory [Line Items] |  |  |  |
Insurance proceeds received |  |  |  | $ 477
Crop Claims |  |  |  |
Inventory [Line Items] |  |  |  |
Insurance proceeds received |  |  |  | $ 8,952

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
- Definition Proceeds Received from Insurance Relating to Property and Casualty Damage Claims + References No definition available. + Details
Name: | alco_ProceedsReceivedfromInsuranceRelatingtoPropertyandCasualtyDamageClaims
Namespace Prefix: | alco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_InventoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyDamagesAwardedValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=alco_PropertyAndCasualtyClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=alco_CropClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |