Annual report pursuant to section 13 and 15(d)

Investments, deposits and other assets (Schedule of Realized Gains and Losses) (Details)

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Investments, deposits and other assets (Schedule of Realized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Investments, deposits and other assets [Abstract]        
Realized gains   $ 8 $ 139 $ 281
Realized losses      [1] (1,685) [1] (40) [1]
Net gain (loss)   8 (1,546) 241
Recorded cooperative allocated surplus $ 1,685      
[1] During the second quarter of 2011, the Company fully reserved $1,685,000 in cooperative allocated surplus it had recorded based on its patronage allocation with Farm Credit.