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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
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]    
Gain on reimbursement of drilling equipment $ 5,254 $ 2,191
Corporate selling, general and administrative costs, corporate depreciation, and corporate restructuring charges 43,715 39,303
Operating loss from continuing operations (42,611) (93,223)
Other income (expense)    
Interest and dividend income 2,589 1,879
Interest expense (6,114) (6,139)
Gain on investment securities 47,862 2,924
Loss on extinguishment of debt (60,083) 0
Other (542) (1,480)
Total other income (expense) (16,288) (2,816)
Loss from continuing operations before income taxes (58,899) (96,039)
Operating Segment    
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]    
Operating loss from continuing operations (12,731) (76,558)
Segment Reconciling Items    
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]    
Gain on reimbursement of drilling equipment 5,254 2,191
Gain (loss) on sale of assets (1,029) 10,145
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 $ (34,105) $ (29,001)