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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income (loss) $ 561,889 $ 45,292 $ (428,549)
Gain on reimbursement of drilling equipment 48,173 29,443 12,322
Other gain (loss) on sale of assets (8,016) 5,432 (11,280)
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges 206,657 182,366 172,195
Other income (expense)      
Interest and dividend income 28,393 18,090 10,254
Interest expense (17,283) (19,203) (23,955)
Gain on investment securities 11,299 57,937 6,727
Loss on extinguishment of debt 0 (60,083) 0
Other 9,081 (10,714) 5,652
Total unallocated amounts 31,490 (13,973) (1,322)
Income (loss) before income taxes 593,379 31,319 (429,871)
Operating Segments      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income (loss) 667,929 151,267 (303,494)
Segment Reconciling Items      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Gain on reimbursement of drilling equipment 48,173 29,443 12,322
Other gain (loss) on sale of assets (8,016) 5,432 (11,280)
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 $ (146,197) $ (140,850) $ (126,097)