Summary Of Significant Accounting Policies (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net	$ 2,825	$ 1,674
Derivative Assets	78	1,046
Futures And Option Contracts In Gain Position [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative Assets	368	583
Futures And Option Contracts In Loss Position [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative Assets	(364)	(82)
Futures And Option Contracts Cash Held By Due To Broker [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative Assets	74	545
Forward Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net	(1,530)	1,894
corn [Member] | Future And Option Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net	(1,295)	(3,568)
Fair Value, Inputs, Level 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative Assets	$ 0	$ 0