Related-Party Transactions (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Related Party Transaction [Line Items]
Contract settlement fee	$ 1,700,000	$ 0	$ 1,700,000	$ 0
Key Coop [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Description of Transaction			100.00%
Loss on Contract Termination			2,000,000
Reduction in termination fee			50,000
Related Party Transaction, Purchases from Related Party	26,049,305	35,466,965	90,508,021	91,196,046
Corn cash contracts	2,357,379		2,357,379
Purchase Commitment, Remaining Minimum Amount Committed	15,418,343		15,418,343
Related Party Transaction, Amounts of Transaction	90,427	34,094	134,623	68,570
Accounts Payable, Related Parties, Current	1,150,155		1,150,155
Contract settlement fee			1,700,000
Payments for Legal Settlements			425,000
Innovative Ag Services [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	1,393	580	19,546	15,003
Accounts Payable, Related Parties, Current	$ 450		$ 450