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Deferred Gain on Sale - Narrative (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 21, 2014 USD ($) a | May 31, 2017 USD ($) | May 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Feb. 02, 2017 USD ($) a
Business Acquisition [Line Items] |  |  |  |  |  |  |
Deferred gain on sale |  |  |  | $ 26,440 | $ 27,204 |  |
Net gain on sale |  |  |  | 2,181 | 618 | $ 13,590 |
Gain on sale of assets |  |  |  | 1,373 | (147) | 290 |
Hendry County Florida |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Land held for sale (in acres) | a | 36,000 |  |  |  |  |  | 49
Cash payment for land | $ 97,900 |  |  |  |  |  | $ 2,200
Post-closing adjustment period | 10 years |  |  |  |  |  |
Gain on sale | $ 42,753 |  |  |  |  |  |
Deferred gain on sale | 29,140 |  |  |  |  |  |
Net gain on sale |  |  |  | 1,400 |  |  |
Maximum exposure to loss on a aggregate undiscounted basis | $ 42,172 |  |  |  |  |  |
Percentage of estimated maximum exposure to loss | 5.00% |  |  |  |  |  |
Hendry County Florida | Other Income (Expense) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net gain on sale |  |  |  |  |  | $ 13,613 |
Property Subject to Operating Lease |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments |  | $ 1,580 | $ 1,702 |  |  |  |
Interest expense |  |  |  | 1,413 | 1,406 |  |
Gain on sale of assets |  |  |  | $ 538 | $ 618 |  |
Property Subject to Operating Lease | Hendry County Florida |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Land held for sale (in acres) | a | 30,600 |  |  |  |  |  |

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