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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Tax Credit Carryforward [Line Items]        
Income tax benefit $ (113,413) $ 25,078 $ (99,275) $ 26,429
Effective tax rate 21.20% 25.90% 20.30% 24.80%
Income taxes paid     $ 43,500  
Prepaid income taxes $ 17,800   17,800  
Tax Year 2019 [Member]        
Tax Credit Carryforward [Line Items]        
Income taxes paid     $ 21,500