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STOCK COMPENSATION (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
Officers
Sep. 30, 2017
USD ($)
$ / shares
shares
Number of Shares        
Options outstanding, beginning of period (in shares) | shares   75,757    
Granted (in shares) | shares   0    
Exercised (in shares) | shares   (23,770)    
Forfeited or expired (in shares) | shares   0    
Options outstanding, end of period (in shares) | shares 51,987 51,987   75,757
Options exercisable, end of period (in shares) | shares 51,987 51,987    
Weighted Average Exercise Price        
Options outstanding, beginning of period (in dollars per share) | $ / shares   $ 22.62    
Granted (in dollars per share) | $ / shares   0.00    
Exercised (in dollars per share) | $ / shares   16.45    
Forfeited or expired (in dollars per share) | $ / shares   0.00    
Options outstanding, end of period (in dollars per share) | $ / shares $ 25.45 25.45   $ 22.62
Options exercisable, end of period (in dollars per share) | $ / shares $ 25.45 $ 25.45    
Weighted Average Remaining Contractual Term        
Options outstanding   2 years 15 days   2 years 3 months 11 days
Options exercisable   2 years 15 days    
Aggregate Intrinsic Value        
Options outstanding, beginning of period | $   $ 4,225    
Granted | $   0    
Exercised | $   1,909    
Forfeited or expired | $   0    
Options outstanding, end of period | $ $ 3,741 3,741   $ 4,225
Options exercisable, end of period | $ $ 3,741 $ 3,741    
Number of Shares        
Nonvested shares outstanding, beginning of period (in shares) | shares   304,526    
Granted (in shares) | shares   64,071    
Vested (in shares) | shares   (71,881)    
Forfeited or expired (in shares) | shares   (1,191)    
Nonvested shares outstanding, end of period (in shares) | shares 295,525 295,525   304,526
Weighted Average Fair Value at Grant        
Nonvested shares outstanding, beginning of period (in dollars per share) | $ / shares   $ 86.96    
Granted (in dollars per share) | $ / shares   92.58    
Vested (in dollars per share) | $ / shares   86.17    
Forfeited or expired (in dollars per share) | $ / shares   79.06    
Nonvested shares outstanding, end of period (in dollars per share) | $ / shares $ 88.40 $ 88.40   $ 86.96
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 | $ $ 14,900 $ 14,900    
Weighted average remaining period for unrecognized stock based compensation   3 years 7 months 17 days