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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Reconciliation of Segment Operating Income (Loss) to Income from Continuing Operations before Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Operating income (loss) $ (128,269) $ 113,457 $ 4,780 $ 349,862
Gain on reimbursement of drilling equipment 6,773 9,732 26,149 24,687
Other loss on sale of assets (1,347) (2,730) (2,136) (2,718)
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges 65,506 60,194 209,407 177,963
Other income (expense)        
Interest and dividend income 2,856 11,888 31,854 29,189
Interest expense (29,200) (4,336) (79,836) (12,969)
Gain (loss) on investment securities (337) 389 14,084 102
Foreign currency exchange loss (9,216) (2,144) (16,137) (4,509)
Other 31,258 3,134 33,214 2,991
Total unallocated amounts (4,639) 8,931 (16,821) 14,804
Income (loss) before income taxes (132,908) 122,388 (12,041) 364,666
Operating Segments        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Operating income (loss) (63,985) 160,262 202,620 468,649
Segment Reconciling Items        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Gain on reimbursement of drilling equipment 6,773 9,732 26,149 24,687
Other loss on sale of assets (1,347) (2,730) (2,136) (2,718)
Corporate, Non-Segment        
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 $ (69,710) $ (53,807) $ (221,853) $ (140,756)