Subsequent Events Subsequent Events (Details) (Subsequent Event, USD $) In Millions, unless otherwise specified	Oct. 26, 2012 Green Plains LLC T bu	Oct. 30, 2012 Mt Pulaski
Subsequent Event [Line Items]
Business acquisition cost of acquired entity agreed upon purchase price	$ 95.5
Capacity of grain terminal (bushels)	32,000,000
Capacity of nutrient storage (tons)	12,000
Business acquisition cost of acquired entity purchase price		$ 7.0

Business Acquisition Cost Of Acquired Entity Agreed Upon Purchase Price

No definition available.

Name:	ande_BusinessAcquisitionCostOfAcquiredEntityAgreedUponPurchasePrice
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business Acquisition Description of Agreed Upon Entity Acquisition Capacity Of Grain Terminal [Table Text Block]

+ References

No definition available.

+ Details

Name:	ande_BusinessAcquisitionDescriptionOfAgreedUponEntityAcquisitionCapacityOfGrainTerminal
Namespace Prefix:	ande_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

- Definition

Business Acquisition Description of Agreed Upon Entity Acquisition Capacity Of Nutrient Storage

+ References

No definition available.

+ Details

Name:	ande_BusinessAcquisitionDescriptionOfAgreedUponEntityAcquisitionCapacityOfNutrientStorage
Namespace Prefix:	ande_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration