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Long-Term Debt (Schedule of Outstanding Debt) (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014
Debt Instrument [Line Items] |  |  |  |
Total | $ 206,580,000 |  | $ 61,640,000 |
Long-term debt, current portion | 4,511,000 |  | 3,196,000 |
Long-term debt, net of current portion | 202,069,000 |  | $ 58,444,000 |
Metropolitan Life Insurance Company and New England Life Insurance Company fixed rate term loans in the original principal amount of $125 million [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | 113,125,000 |  |  |
Principal amount of debt | $ 125,000,000 |  |  |
Fixed interest rate | 4.15% |  |  |
Metropolitan Life Insurance Company and New England Life Insurance Company variable rate term loans in the original principal amounts of $57.5 million [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 56,063,000 |  |  |
Principal amount of debt | $ 57,500,000 |  |  |
Effective interest rate | 1.78% |  |  |
Metropolitan Life Insurance Company term loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 500,000 |  |  |
Fixed interest rate | 5.49% |  |  |
Amount of future advance | $ 4,500,000 |  |  |
Rabo Agrifinance, Inc. variable rate term loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total |  |  | $ 34,000,000 |
Effective interest rate | 2.40% |  |  |
Prudential Mortgage Capital Company, LLC fixed rate term loans (5.35%) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 25,930,000 | $ 25,930,000 | $ 27,550,000 | $ 27,550,000
Fixed interest rate | 5.35% |  |  |
Prudential Mortgage Capital Company, LLC fixed rate term loan (3.85%) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 5,445,000 | $ 5,445,000 |  |
Fixed interest rate | 3.85% | 3.85% |  |
Prudential Mortgage Capital Company, LLC fixed rate term loan (3.45%) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 5,445,000 | $ 5,445,000 |  |
Fixed interest rate | 3.45% | 3.45% |  |
Note Payable to Financing Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total | $ 72,000 |  | $ 90,000 |

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