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Debt - Debt Prior to Refinancing (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 03, 2014 | Dec. 02, 2014 | Sep. 30, 2014 | Sep. 30, 2010 | Sep. 30, 2015
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate term loans |  |  | $ 61,640,000 |  | $ 205,881,000
Outstanding balance |  |  | 3,160,000 |  | 0
Debt financing costs | $ 2,834,000 |  |  |  |
Deferred financing costs |  |  |  |  | 2,543,000
Rabo Agrifinance, Inc. variable rate term loan. The loan was refinanced on December 3, 2014. |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving line of credit |  | $ 60,000,000 |  |  |
Outstanding balance |  |  | $ 0 |  |
Deferred financing costs |  |  |  |  | 318,000
Rabo Agrifinance, Inc. variable rate term loan. The loan was refinanced on December 3, 2014. | One Month LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
LIBOR spread | 1.95% |  | 1.95% |  |
Rabo Agrifinance, Inc. variable rate term loan. The loan was refinanced on December 3, 2014. | One Month LIBOR | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
LIBOR spread |  | 1.95% |  |  |
Rabo Agrifinance, Inc. variable rate term loan. The loan was refinanced on December 3, 2014. | One Month LIBOR | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
LIBOR spread |  | 2.95% |  |  |
Rabo Agrifinance, Inc. variable rate term loan. The loan was refinanced on December 3, 2014. | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Annual commitment fee (as a percent) |  | 0.20% |  |  |
Rabio Agrifinance Inc |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt financing costs |  |  |  | $ 1,202,000 |
Deferred financing costs | $ 318,000 | $ 697,000 |  |  |
Write off amount | 379,000 |  |  |  |
Metropolitan Life Insurance Company and New England Life Insurance Company variable rate term loans in the original principal amounts of $57,500,000: the variable interest rate was approximately 1.80% per annum as of September 30, 2015. The loans are collateralized by real estate and mature in November 2029. |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate term loans | $ 57,500,000 | 33,500,000 | $ 0 |  | $ 55,344,000
Quarterly principal payments |  | $ 500,000 |  |  |
Variable interest rate |  |  | 2.40% |  | 1.80%
Metropolitan Life Insurance Company and New England Life Insurance Company variable rate term loans in the original principal amounts of $57,500,000: the variable interest rate was approximately 1.80% per annum as of September 30, 2015. The loans are collateralized by real estate and mature in November 2029. | One Month LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
LIBOR spread |  | 2.25% |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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