Parent Financial Statements - Additional Information (Detail) - ABE South Dakota [Member] - USD ($)	9 Months Ended	12 Months Ended
	Jun. 30, 2016	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Distributions from subsidiaries		$ 0	$ 0	$ 0
2010 Senior Credit Agreement [Member]
Maximum principal outstanding on senior term loan for equity distribution	$ 25,000,000
AgCountry Farm Senior Credit Agreement [Member] | Maximum [Member]
Threshold pre-tax net income distribution	40.00%