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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2018
Income Tax Contingency [Line Items]          
Income tax expense $ 6,548 $ 8,399 $ 12,232 $ 8,741  
Effective tax rate, percent     25.30% 20.70%  
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit)     $ 3,600    
Forecast          
Income Tax Contingency [Line Items]          
Federal statutory prorated rate, percent         24.53%