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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
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Gain on sale of assets $ 1,042 $ 46,775 $ 39,691
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges 172,195 167,513 194,416
Operating income (loss) from continuing operations (428,549) (620,187) 20,582
Other income (expense)      
Interest and dividend income 10,254 7,304 9,468
Interest expense (23,955) (24,474) (25,188)
Gain (loss) on investment securities 6,727 (8,720) (54,488)
Gain on sale of subsidiary 0 14,963 0
Other (5,657) (5,384) (1,596)
Total other income (expense) (12,631) (16,311) (71,804)
Loss from continuing operations before income taxes (441,180) (636,498) (51,222)
Operating Segments      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Operating income (loss) from continuing operations (303,494) (544,389) 109,233
Segment Reconciling Items      
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]      
Gain on sale of assets 1,042 46,775 39,691
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 $ (126,097) $ (122,573) $ (128,342)