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Selected Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Inventory casualty loss adjustment | $ 14,900,000,000 |  |  |  |  |  |  |
Inventory Adjustments | $ 6,676,000,000 |  |  |  |  | $ 6,676,000,000 |  |
Proceeds from federal relief grants |  |  |  |  |  | $ 1,123,000 | $ 4,299,000 | $ 4,629,000
Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain on sale of assets |  | $ 5,616,000,000 | $ 26,554,000,000 | $ 8,445,000,000 |  |  |  |
Grove Management Services |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Operating Revenue |  | 3,367,000,000 | 4,057,000,000 | 3,128,000,000 | $ 3,083,000,000 |  |  |
Operating expenses |  | $ 2,966,000,000 | $ 3,795,000,000 | $ 2,902,000,000 | $ 3,015,000,000 |  |  |

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