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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, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Operating income $ 110,572 $ 175,205 $ 234,040 $ 319,428
Gain on reimbursement of drilling equipment 7,461 11,574 14,955 27,298
Other gain (loss) on sale of assets (2,431) 2,519 12 4,898
Corporate selling, general and administrative costs and corporate depreciation 62,037 52,855 118,614 101,310
Other income (expense)        
Interest and dividend income 6,567 5,055 17,301 9,760
Interest expense (4,261) (4,239) (8,633) (8,594)
Gain (loss) on investment securities 3,747 39,752 (287) 24,661
Other 400 (604) (143) (546)
Total unallocated amounts 6,453 39,964 8,238 25,281
Income before income taxes 117,025 215,169 242,278 344,709
Operating Segments        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Operating income 152,790 197,347 306,022 357,951
Segment Reconciling Items        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Gain on reimbursement of drilling equipment 7,461 11,574 14,955 27,298
Other gain (loss) on sale of assets (2,431) 2,519 12 4,898
Corporate, Non-Segment        
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]        
Corporate selling, general and administrative costs and corporate depreciation $ (47,248) $ (36,235) $ (86,949) $ (70,719)