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, 2021
Sep. 30, 2020
Sep. 30, 2019
Operating Loss Carryforwards [Line Items]      
Income tax expense (benefit) $ 6,375 $ (18,685) $ 806
Foreign subsidiaries income (loss) before income taxes 6,685 (68,343) $ 11,042
Undistributed earnings of foreign subsidiaries 358,342    
Valuation allowances 28,619 22,527  
Unrecognized tax benefits 2,807    
Change in unrecognized tax benefits 414    
Total penalties and interest accrued 691 $ 2,172  
Capital Loss Carryforward      
Operating Loss Carryforwards [Line Items]      
Amount of tax credit carryforward 21,037    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards 218,691    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards $ 3,045