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Inventories - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 18, 2019 | Nov. 07, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Inventory [Line Items] |  |  |  |  |  |
Inventory casualty loss |  |  |  | $ 0 | $ 0 | $ 13,489,000
Proceeds received from insurance relating to property and casualty damage claims |  |  | $ 486,000 | 486,000 |  |
Proceeds from federal relief grants |  |  | $ 15,597,000 | 15,597,000 |  |
Subsequent Event |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Proceeds from federal relief grants | $ 3,973,000 | $ 163,800 |  |  |  |
Property and Casualty Claims |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Inventory casualty loss |  |  |  |  | 13,489,000 |
Insurance proceeds received |  |  |  |  | 477,000 |
Crop Claims |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Insurance proceeds received |  |  |  |  | 8,952,000 |
Year-End Adjustment |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Inventory casualty loss |  |  |  | $ 808,000 | $ 1,115,000 |

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