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Inventories - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Inventory [Line Items] |  |  |  |
Proceeds received from insurance relating to property and casualty damage claims |  |  | $ 486 |
Proceeds from federal relief grants | $ 4,466 | $ 15,597 |  |
Property and Casualty Claims |  |  |  |
Inventory [Line Items] |  |  |  |
Insurance proceeds received |  |  |  | $ 477
Crop Claims |  |  |  |
Inventory [Line Items] |  |  |  |
Insurance proceeds received |  |  |  | $ 8,952

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