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Selected Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Inventory casualty loss and net realizable value adjustment |  |  | $ 14,688 |  |
Impairments of long-lived assets |  |  | $ 9,346 |  |
Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment loss |  | $ 1,855 |  |  | $ 5,215
Proceeds received from property and casualty damage claims |  | 477 |  |  |
Proceeds received from crop claims |  | $ 3,726 |  |  |
Crop Claims |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Insurance proceeds received |  |  |  | $ 8,952 |
Crop Claims | Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Insurance proceeds received | $ 5,226 |  |  |  |

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