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STOCK COMPENSATION (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Officers
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Number of Shares      
Options outstanding, beginning of period (in shares) | shares   125,560  
Granted (in shares) | shares   0  
Exercised (in shares) | shares   (26,352)  
Forfeited or expired (in shares) | shares   (16,252)  
Options outstanding, end of period (in shares) | shares 82,956 82,956 125,560
Options exercisable, end of period (in shares) | shares 82,956 82,956  
Weighted Average Exercise Price      
Options outstanding, beginning of period (in dollars per share) | $ / shares   $ 25.73  
Granted (in dollars per share) | $ / shares   0.00  
Exercised (in dollars per share) | $ / shares   32.63  
Forfeited or expired (in dollars per share) | $ / shares   24.61  
Options outstanding, end of period (in dollars per share) | $ / shares $ 23.76 23.76 $ 25.73
Options exercisable, end of period (in dollars per share) | $ / shares $ 23.76 $ 23.76  
Weighted Average Remaining Contractual Term      
Options outstanding   2 years 6 months 29 days 2 years 8 months 5 days
Options exercisable   2 years 6 months 29 days  
Aggregate Intrinsic Value      
Options outstanding, beginning of period | $   $ 4,379  
Granted | $    
Exercised | $   1,682  
Forfeited or expired | $   1,272  
Options outstanding, end of period | $ $ 5,371 5,371 $ 4,379
Options exercisable, end of period | $ $ 5,371 $ 5,371  
Number of Shares      
Nonvested shares outstanding, beginning of period (in shares) | shares   20,656  
Granted (in shares) | shares   306,603  
Vested (in shares) | shares   (20,629)  
Forfeited or expired (in shares) | shares   (442)  
Nonvested shares outstanding, end of period (in shares) | shares 306,188 306,188 20,656
Weighted Average Fair Value at Grant      
Nonvested shares outstanding, beginning of period (in dollars per share) | $ / shares   $ 41.37  
Granted (in dollars per share) | $ / shares   87.91  
Vested (in dollars per share) | $ / shares   72.34  
Forfeited or expired (in dollars per share) | $ / shares   56.25  
Nonvested shares outstanding, end of period (in dollars per share) | $ / shares $ 85.86 $ 85.86 $ 41.37
Number of Company's Named Executive Officers with stock awards | Officers 3    
Executive award vesting period 8 years    
Stock based compensation expense not yet recognized in income | $ $ 21,400 $ 21,400  
Weighted average remaining period for unrecognized stock based compensation   4 years 18 days