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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, 2022
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income (loss) from continuing operations $ 45,292 $ (428,549) $ (620,187)
Gain on reimbursement of drilling equipment 29,443 12,322 26,959
Other gain (loss) on sale of assets 5,432 (11,280) 19,816
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges 182,366 172,195 167,513
Other income (expense)      
Interest and dividend income 18,090 10,254 7,304
Interest expense (19,203) (23,955) (24,474)
Gain (loss) on investment securities 57,937 6,727 (8,720)
Gain on sale of subsidiary 0 0 14,963
Loss on extinguishment of debt (60,083) 0 0
Other (11,115) (5,657) (5,384)
Total unallocated amounts (14,374) (12,631) (16,311)
Income (loss) from continuing operations before income taxes 30,918 (441,180) (636,498)
Operating Segments      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income (loss) from continuing operations 151,267 (303,494) (544,389)
Segment Reconciling Items      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Gain on reimbursement of drilling equipment 29,443 12,322 26,959
Other gain (loss) on sale of assets 5,432 (11,280) 19,816
Corporate, Non-Segment      
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 $ (140,850) $ (126,097) $ (122,573)