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STOCK COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Number of Shares    
Options outstanding, beginning of period (in shares) 59,835  
Granted (in shares) 0  
Exercised (in shares) (29,922)  
Forfeited or expired (in shares) 0  
Options outstanding, end of period (in shares) 29,913 59,835
Options exercisable, end of period (in shares) 29,913  
Weighted Average Exercise Price    
Options outstanding, beginning of period (in dollars per share) $ 8.06  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 6.86  
Forfeited or expired (in dollars per share) 0  
Options outstanding, end of period (in dollars per share) 9.27 $ 8.06
Options exercisable, end of period (in dollars per share) $ 9.27  
Weighted Average Remaining Contractual Term    
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 9 months 10 days 1 year 6 months 14 days
Exercised 1 year 3 months 14 days  
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 9 months 10 days 1 year 6 months 14 days
Options exercisable 9 months 10 days  
Aggregate Intrinsic Value    
Options outstanding, beginning of period $ 1,469  
Granted 0  
Exercised 749  
Forfeited or expired 0  
Options outstanding, end of period 372 $ 1,469
Options exercisable, end of period $ 372  
Number of Shares    
Nonvested shares outstanding, beginning of period (in shares) 926,122  
Granted (in shares) 179,372  
Vested (in shares) (272,859)  
Forfeited or expired (in shares) (9,584)  
Nonvested shares outstanding, end of period (in shares) 823,051 926,122
Weighted Average Fair Value at Grant    
Nonvested shares outstanding, beginning of period (in dollars per share) $ 29.54  
Granted (in dollars per share) 33.29  
Vested (in dollars per share) 30.08  
Forfeited or expired (in dollars per share) 31.48  
Nonvested shares outstanding, end of period (in dollars per share) $ 30.15 $ 29.54
Stock based compensation expense not yet recognized in income $ 11,100  
Weighted average remaining period for unrecognized stock based compensation 2 years 6 months 10 days