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, 2018
Sep. 30, 2017
Sep. 30, 2016
Operating Loss Carryforwards [Line Items]      
Federal statutory tax rate 24.50% 35.00% 35.00%
Provisional net tax benefit $ 29,150    
Tax benefit recognized during the year 38,010    
One-time transition tax expense 8,860    
Income tax expense (benefit) (9,118) $ 22,354 $ 29,073
Foreign subsidiaries income before income taxes 56,424 24,118 $ 48,864
Undistributed earnings of foreign subsidiaries 289,702    
Valuation allowances (14,137) (20,866)  
Unrecognized tax benefits 10,718    
Change in unrecognized tax benefits 2,786    
Total penalties and interest accrued 2,229 $ 1,779  
Capital Loss Carryforward      
Operating Loss Carryforwards [Line Items]      
Amount of tax credit carryforward 20,370    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards 60,705    
Amount of tax credit carryforward 2,934    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Amount of operating loss carryforwards $ 4,684