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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Gain on reimbursement of drilling equipment $ 6,448 $ 3,748 $ 11,702 $ 5,939
Corporate selling, general and administrative costs, corporate depreciation, and corporate restructuring charges 47,051 39,349 90,766 78,652
Operating loss from continuing operations (22,617) (160,923) (65,228) (254,146)
Other income (expense)        
Interest and dividend income 3,399 4,819 5,988 6,698
Interest expense (4,390) (5,759) (10,504) (11,898)
Gain on investment securities 22,132 2,520 69,994 5,444
Loss on extinguishment of debt 0 0 (60,083) 0
Other (476) (577) (1,018) (2,057)
Total other income (expense) 20,665 1,003 4,377 (1,813)
Loss from continuing operations before income taxes (1,952) (159,920) (60,851) (255,959)
Operating Segment        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Operating loss from continuing operations 6,863 (114,819) (5,868) (191,377)
Segment Reconciling Items        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Gain on reimbursement of drilling equipment 6,448 3,748 11,702 5,939
Other gain (loss) on sale of assets 716 (22,263) (313) (12,118)
Corporate G&A        
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 $ (36,644) $ (27,589) $ (70,749) $ (56,590)