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Selected Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds received from insurance relating to property and casualty damage claims | $ 486 |  |  | $ 486 |
Proceeds from federal relief grants | 15,597 |  |  | $ 15,597 |
Pension expense | 935 |  |  |  |
Gain on sale of assets | $ 13,166 |  |  |  |
Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds received from insurance relating to property and casualty damage claims |  |  | $ 477 |  |
Proceeds from insurance settlement, 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 | Discontinued Operations, 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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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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