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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Inventory [Line Items] |  |
Total Inventories | $ 58,539 us-gaap_InventoryNet | $ 25,469 us-gaap_InventoryNet
Orange Groves [Member] |  |
Inventory [Line Items] |  |
Agricultural related inventory | 52,139 us-gaap_AgriculturalRelatedInventoryGrowingCrops / us-gaap_PublicUtilitiesInventoryAxis = naics_ZZ111310 | 23,502 us-gaap_AgriculturalRelatedInventoryGrowingCrops / us-gaap_PublicUtilitiesInventoryAxis = naics_ZZ111310
Beef Cattle Ranching and Farming [Member] |  |
Inventory [Line Items] |  |
Agricultural related inventory | 2,538 us-gaap_AgriculturalRelatedInventoryGrowingCrops / us-gaap_PublicUtilitiesInventoryAxis = naics_ZZ112111 | 1,022 us-gaap_AgriculturalRelatedInventoryGrowingCrops / us-gaap_PublicUtilitiesInventoryAxis = naics_ZZ112111
Nursery Inventory [Member] |  |
Inventory [Line Items] |  |
Other | 1,876 us-gaap_OtherInventory / us-gaap_PublicUtilitiesInventoryAxis = alco_NurseryInventoryMember | 516 us-gaap_OtherInventory / us-gaap_PublicUtilitiesInventoryAxis = alco_NurseryInventoryMember
Other Inventory [Member] |  |
Inventory [Line Items] |  |
Other | $ 1,986 us-gaap_OtherInventory / us-gaap_PublicUtilitiesInventoryAxis = alco_OtherInventoryMember | $ 429 us-gaap_OtherInventory / us-gaap_PublicUtilitiesInventoryAxis = alco_OtherInventoryMember

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- Definition Carrying amount as of the balance sheet date of agricultural goods that are not yet mature and thus have not yet been harvested. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 + Details
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 + Details
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