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INCOME TAXES, Changes in the Gross Unrecognized Tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Reconciliation of gross unrecognized tax benefits [Roll Forward]      
Beginning balance $ 2,270 $ 2,089 $ 1,773
Additions for tax positions relating to the current fiscal year 263 381 364
Additions for tax positions relating to prior fiscal years 116 44 200
Settlements with taxing authorities   0 (248)
Lapse of statute of limitations (1,215) (244)  
Ending balance 1,434 2,270 $ 2,089
Accrued interest and penalties on uncertain tax positions $ 69 $ 100  
Federal [Member]      
Income Tax Examination [Line Items]      
Tax periods open to examination by taxing authorities 2015 2016 2017 2018    
State and Local Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Tax periods open to examination by taxing authorities 2014 2015 2016 2017 2018    
Foreign Country [Member]      
Income Tax Examination [Line Items]      
Tax periods open to examination by taxing authorities 2013 2014 2015 2016 2017 2018