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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of Segment Operating Income (Loss) to Income from Continuing Operations before Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income $ 451,899 $ 561,889 $ 45,292
Acquisition transaction costs 14,982 0 0
Gain on reimbursement of drilling equipment 33,309 48,173 29,443
Other gain (loss) on sale of assets (5,139) (8,016) 5,432
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges 244,877 206,657 182,366
Other income (expense)      
Interest and dividend income 41,168 28,393 18,090
Interest expense (29,093) (17,283) (19,203)
Gain on investment securities 13,953 11,299 57,937
Loss on extinguishment of debt 0 0 (60,083)
Other 3,093 9,081 (10,714)
Other income (expense) 29,121 31,490 (13,973)
Income before income taxes 481,020 593,379 31,319
Operating Segments      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income 622,042 667,929 151,267
Segment Reconciling Items      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Acquisition transaction costs (14,982) 0 0
Gain on reimbursement of drilling equipment 33,309 48,173 29,443
Other gain (loss) on sale of assets (5,139) (8,016) 5,432
Investments and corporate operations      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges $ (183,331) $ (146,197) $ (140,850)