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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
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Operating income (loss) from continuing operations $ 175,205 $ (22,617) $ 319,428 $ (65,228)
Gain on reimbursement of drilling equipment 11,574 6,448 27,298 11,702
Other gain (loss) on sale of assets 2,519 716 4,898 (313)
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges 52,855 47,051 101,310 90,766
Other income (expense)        
Interest and dividend income 5,055 3,399 9,760 5,988
Interest expense (4,239) (4,390) (8,594) (10,504)
Gain on investment securities 39,752 22,132 24,661 69,994
Loss on extinguishment of debt 0 0 0 (60,083)
Other (743) (476) (1,403) (1,018)
Total unallocated amounts 39,825 20,665 24,424 4,377
Income (loss) from continuing operations before income taxes 215,030 (1,952) 343,852 (60,851)
Operating Segments        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Operating income (loss) from continuing operations 197,347 6,863 357,951 (5,868)
Segment Reconciling Items        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Gain on reimbursement of drilling equipment 11,574 6,448 27,298 11,702
Other gain (loss) on sale of assets 2,519 716 4,898 (313)
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 $ (36,235) $ (36,644) $ (70,719) $ (70,749)