Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Operating Loss Carryforwards [Line Items]      
Federal statutory tax rate 21.00% 21.00% 24.50%
Income tax expense (benefit) $ (18,685) $ 806 $ (9,118)
Foreign subsidiaries income (loss) before income taxes (68,343) 11,042 $ 56,424
Undistributed earnings of foreign subsidiaries 383,423    
Valuation allowances (22,527) (15,352)  
Unrecognized tax benefits 7,066    
Change in unrecognized tax benefits 7,803    
Total penalties and interest accrued 2,172 $ 2,880  
Capital Loss Carryforward      
Operating Loss Carryforwards [Line Items]      
Amount of tax credit carryforward 20,119    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards 101,994    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards $ 2,189