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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.

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- Definition The amount of patronage earnings retained within the cooperative during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 905 -SubTopic 505 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6471095&loc=d3e5999-110063 + Details
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- Definition This item represents the gain realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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