XML 19 R33.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Treasury Stock (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2012
Treasury Stock [Abstract] |
Schedule of Information Relating to Purchases |
Fiscal period ended |  | Total number of shares purchased |  | Average price paid per share |  | Total shares purchased as part of publicly announced plan or program |  | Total dollar value of shares purchased
|  | (Dollars in thousands, except share data)
September 30, 2012 |  |  |  |  | 12,332 |  |  | $ | 24.12 |  |  |  | 181,316 |  |  | $ | 298 |
September 30, 2011 |  |  |  |  | 48,280 |  |  | $ | 24.96 |  |  |  | 168,984 |  |  | $ | 1,205 |
September 30, 2010 |  |  |  |  | 23,466 |  |  | $ | 26.74 |  |  |  | 120,704 |  |  | $ | 628 |
Schedule of Treasury Stock Transactions |
|  | Shares |  | Cost
|  | (Dollars in thousands, except share data)
Balance September 30, 2010 |  |  |  | 7,466 |  |  | $ | 172 |
Purchases |  |  |  | 48,280 |  |  |  | 1,205 |
Issuances |  |  |  | (19,030 | ) |  |  | (465 | )
Retired |  |  |  | (2,123 | ) |  |  | (50 | )
Balance September 30, 2011 |  |  |  | 34,593 |  |  |  | 862 |
Purchases |  |  |  | 12,332 |  |  |  | 298 |
Issuances |  |  |  | (23,690 | ) |  |  | (617 | )
Balance September 30, 2012 |  |  |  | 23,235 |  |  | $ | 543 |

X
- Definition Schedule Of Information Related To Purchases Of Common Shares [Table Text Block]. + References No definition available. + Details
Name: | alco_ScheduleOfInformationRelatedToPurchasesOfCommonSharesTableTextBlock
Namespace Prefix: | alco_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Treasury Stock Transactions [Table Text Block]. + References No definition available. + Details
Name: | alco_ScheduleOfTreasuryStockTransactionsTableTextBlock
Namespace Prefix: | alco_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TreasuryStockNumberOfSharesAndRestrictionDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration