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STOCK OPTION PLAN (Details) - USD ($)
 9 Months Ended 12 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Number of Shares    
Options outstanding, beginning of period (in shares) 189,088  
Granted (in shares) 0  
Exercised (in shares) (56,580)  
Forfeited or expired (in shares) 0  
Options outstanding, end of period (in shares) 132,508 189,088
Options exercisable, end of period (in shares) 132,508  
Weighted Average Exercise Price    
Options outstanding, beginning of period (in dollars per share) $ 25.74  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 25.12  
Forfeited or expired (in dollars per share) 0  
Options outstanding, end of period (in dollars per share) 26.01 $ 25.74
Options exercisable, end of period (in dollars per share) $ 26.01  
Weighted Average Remaining Contractual Term    
Options outstanding 2 years 10 months 24 days 3 years 1 month 28 days
Options exercisable 2 years 10 months 24 days  
Aggregate Intrinsic Value    
Options outstanding, beginning of period $ 3,027,000  
Granted 0  
Exercised 1,316,000  
Forfeited or expired 0  
Options outstanding, end of period 3,306,000 $ 3,027,000
Options exercisable, end of period $ 3,306,000  
Number of Shares    
Nonvested shares outstanding, beginning of period (in shares) 44,002  
Granted (in shares) 7,571  
Vested (in shares) (26,085)  
Forfeited or expired (in shares) 4,547  
Nonvested shares outstanding, end of period (in shares) 30,035 44,002
Weighted Average Fair Value at Grant    
Nonvested shares outstanding, beginning of period (in dollars per share) $ 40.80  
Granted (in dollars per share) 41.68  
Vested (in dollars per share) 40.52  
Forfeited or expired (in dollars per share) 44.25  
Nonvested shares outstanding, end of period (in dollars per share) $ 41.42 $ 40.80
Stock based compensation expense not yet recognized in income $ 291,017  
Weighted average remaining period for unrecognized stock based compensation 1 year 9 months 28 days