Quarterly report pursuant to Section 13 or 15(d)

Orange-Co Acquisition (Schedule of Purchase Consideration) (Details)

v2.4.1.9
Orange-Co Acquisition (Schedule of Purchase Consideration) (Details) (USD $)
3 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 02, 2014
Business Acquisition [Line Items]      
Cash proceeds from sugarcane disposition $ 265,063,000us-gaap_PaymentsToAcquireBusinessesGross     
Orange-Co Acquisition [Member]      
Business Acquisition [Line Items]      
Cash proceeds from sugarcane disposition 97,126,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= alco_OrangeCoAcquisitionMember
  147,500,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= alco_OrangeCoAcquisitionMember
Total purchase consideration 265,063,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= alco_OrangeCoAcquisitionMember
   
Orange-Co Acquisition [Member] | Line of Credit [Member]      
Business Acquisition [Line Items]      
Liabilities incurred 27,775,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= alco_OrangeCoAcquisitionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Orange-Co Acquisition [Member] | Term Loan [Member]      
Business Acquisition [Line Items]      
Liabilities incurred $ 140,162,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= alco_OrangeCoAcquisitionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember