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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income $ 3,318 $ 457,449 $ 568,308
Acquisition transaction costs 54,702 14,982 0
Gain on reimbursement of drilling equipment 33,398 33,309 48,173
Other loss on sale of assets (1,541) (5,139) (8,016)
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges 287,052 244,883 206,687
Other income (expense)      
Interest and dividend income 35,207 41,168 28,393
Interest expense (107,808) (29,093) (17,283)
Gain (loss) on investment securities (22,377) 13,953 11,299
Foreign currency exchange loss (9,682) (5,550) (6,419)
Other 27,229 3,093 9,081
Other income (expense) (77,431) 23,571 25,071
Income (loss) before income taxes (74,113) 481,020 593,379
Operating Segments      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income 338,208 627,690 653,801
Acquisition transaction costs 4,597    
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges 89,898 74,134 71,833
Segment Reconciling Items      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income (103,397) (1,359) 15,876
Gain on reimbursement of drilling equipment 33,398 33,309 48,173
Other loss on sale of assets (1,541) (5,139) (8,016)
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, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges (259,351) (198,313) (146,197)
Operating Segments Excluding Intersegment Elimination      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income $ 230,812 $ 627,592 $ 674,348