Derivative Financial Instruments and Fair Value Measurements (Notional Amounts) (Details) bu in Thousands	Sep. 30, 2017 bu bu lots
Corn [Member]
Derivative [Line Items]
Inventories Carried At Market Unit	228,722
Soybean [Member]
Derivative [Line Items]
Inventories Carried At Market Unit	183,325
Not Designated as Hedging Instrument [Member] | Future And Forward Contracts [Member] | Cocoa [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | lots	235
Not Designated as Hedging Instrument [Member] | Future And Forward Contracts [Member] | Coffee [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | lots	4
Not Designated as Hedging Instrument [Member] | Future And Forward Purchase Contracts [Member] | Corn [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(120)
Not Designated as Hedging Instrument [Member] | Future And Forward Purchase Contracts [Member] | Soybean [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	44
Not Designated as Hedging Instrument [Member] | Future And Forward Sale Contracts [Member] | Corn [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(493)
Not Designated as Hedging Instrument [Member] | Future And Forward Sale Contracts [Member] | Soybean [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	(676)
Not Designated as Hedging Instrument [Member] | Future [Member] | Corn [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	365
Not Designated as Hedging Instrument [Member] | Future [Member] | Soybean [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	495