Major Customers - Additional Information (Detail) - ABE South Dakota [Member]	9 Months Ended
Jun. 30, 2016
Ethanol Marketing Agreements [Member]
Revenue, Major Customer [Line Items]
Agreement expiration date	Jun. 30, 2019
Co-product Marketing Agreement [Member]
Revenue, Major Customer [Line Items]
Agreement expiration date	Jul. 31, 2017

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.

No definition available.

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