Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (unaudited) - Narrative (Details)

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Selected Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from federal relief grants           $ 4,299,000 $ 4,629,000 $ 15,597,000
Proceeds for reimbursement of legal fees   $ 658,000,000            
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   30,288,000,000     $ 27,470,000,000      
Grove Management Services                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Operating Revenue $ 3,083,000,000 5,114,000,000 $ 4,685,000,000 $ 2,869,000,000 3,246,000,000      
Operating expenses $ 3,015,000,000 $ 4,545,000,000 $ 4,150,000,000 $ 2,631,000,000 $ 2,951,000,000