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, 2019
Sep. 30, 2018
Sep. 30, 2017
Operating Loss Carryforwards [Line Items]      
Federal statutory tax rate 21.00% 24.50% 35.00%
One-time transition tax expense $ 300    
Income tax expense (benefit) 806 $ (9,118) $ 22,354
Foreign subsidiaries income before income taxes 11,042 56,424 $ 24,118
Undistributed earnings of foreign subsidiaries 256,695    
Valuation allowances (15,352) (15,188)  
Unrecognized tax benefits 11,417    
Change in unrecognized tax benefits 4,910    
Total penalties and interest accrued 2,880 $ 2,229  
Capital Loss Carryforward      
Operating Loss Carryforwards [Line Items]      
Amount of tax credit carryforward 19,223    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards 65,002    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards $ 4,033