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Long-Term Debt and Lines of Credit - Silver Nip Citrus Debt (Details) |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 03, 2014 USD ($) | Sep. 04, 2014 USD ($) a loan | Mar. 31, 2018 USD ($) loan | Mar. 31, 2018 USD ($) loan | Sep. 30, 2017 USD ($) | Dec. 01, 2016 USD ($) | Feb. 28, 2015 USD ($) | Feb. 15, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate term loans |  |  | $ 179,761,000 | $ 179,761,000 | $ 186,476,000 |  |  |
Fixed Interest Rate Term Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate term loans | $ 125,000,000 |  | $ 99,062,000 | $ 99,062,000 | $ 99,062,000 |  |  |
Fixed interest rate (as a percentage) | 4.15% |  |  |  |  |  |  |
Quarterly principal payments | $ 2,281,250 |  |  |  |  |  |  |
Prepayment amount of the fixed term loan | $ 8,750,000 |  |  |  |  |  |  |
Silver Nip Citrus |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of fixed rate term loans | loan |  | 2 |  |  |  |  |  |
Silver Nip Citrus | Citrus Grove |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Area of land acquired (in acres) | a |  | 1,500 |  |  |  |  |  |
Silver Nip Citrus | Fixed Interest Rate Term Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of fixed rate term loans | loan |  |  | 2 | 2 |  |  |  |
Interest rate term loans |  |  | $ 27,550,000 | $ 27,550,000 |  |  |  |
Fixed interest rate (as a percentage) |  |  | 5.35% | 5.35% |  |  |  |
Quarterly principal payments |  |  |  | $ 290,000 |  |  |  |
Prepayment amount of the fixed term loan |  |  | $ 5,000,000 | 5,000,000 |  |  |  |
Amount of prepayment in excess of total without penalty |  |  | 203,000 |  |  |  |  |
Premium payment of penalty |  |  | 22,000 |  |  |  |  |
Amount of prepayment |  |  | $ 4,453,000 | $ 4,453,000 |  |  |  | $ 750,000
Silver Nip Citrus | Fixed Interest Rate Term Loans | Prudential |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate term loans |  | $ 5,500,000 |  |  |  |  |  |
Quarterly principal payments |  | $ 55,000 |  |  |  |  |  |
Silver Nip Citrus | Fixed Rate Term Loan1 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percentage) |  | 3.85% |  |  |  |  |  |
Silver Nip Citrus | Fixed Rate Term Loan 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percentage) |  | 3.45% |  |  |  |  |  |
Loans Payable | Silver Nip Citrus |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate term loans |  |  |  |  |  |  | $ 7,000,000 |
Limited guaranty and security agreement |  |  |  |  |  | $ 8,000,000 | $ 7,000,000 |
Maximum | Silver Nip Citrus |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Covenant ratio |  |  | 1.50 | 1.50 |  |  |  |
Minimum | Silver Nip Citrus |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Covenant ratio |  |  | 1.00 | 1.00 |  |  |  |

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