STOCK OPTION PLAN (Details) (USD $)	6 Months Ended	12 Months Ended
	Mar. 31, 2014	Sep. 30, 2013
Number of Shares [Roll Forward]
Options outstanding, September 30, 2013 (in shares)	318,648
Granted (in shares)	0
Exercised (in shares)	(54,557)
Forfeited or expired (in shares)	0
Options outstanding, March 31, 2014 (in shares)	264,091	318,648
Options exercisable, March 31, 2014 (in shares)	261,341
Weighted Average Exercise Price [Roll Forward]
Options outstanding, September 30, 2013 (in dollars per share)	$ 24.44
Granted (in dollars per share)	$ 0
Exercised (in dollars per share)	$ 22.66
Forfeited or expired (in dollars per share)	$ 0
Options outstanding, March 31, 2014 (in dollars per share)	$ 24.81	$ 24.44
Options exercisable, March 31, 2014 (in dollars per share)	$ 24.77
Weighted Average Remaining Contractual Term (Yrs) [Abstract]
Options outstanding, September 30, 2013	3 years 11 months 1 day	4 years 2 months 5 days
Options outstanding, March 31, 2014	3 years 11 months 1 day	4 years 2 months 5 days
Options exercisable, March 31, 2014	3 years 10 months 20 days
Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value of options outstanding at beginning of period	$ 4,376,000
Aggregate Intrinsic Value of options exercised	952,000
Aggregate Intrinsic Value of options forfeited or expired	0
Aggregate Intrinsic Value of options outstanding at end of period	5,281,000	4,376,000
Aggregate Intrinsic Value of options exercisable at end of period	5,238,000
Nonvested Number of Shares Outstanding, Number of Shares [Roll Forward]
Nonvested shares outstanding, beginning period (in shares)	4,000
Granted (in shares)	4,150
Vested (in shares)	(4,150)
Forfeited or expired (in shares)	0
Nonvested shares outstanding, ending period (in shares)	4,000	4,000
Weighted average grant date fair value [Roll Forward]
Nonvested shares outstanding, beginning of period (in dollars per share)	$ 25.67
Granted (in dollars per share)	$ 37.85
Vested (in dollars per share)	$ 35.02
Forfeited or expired (in dollars per share)	$ 0
Nonvested shares outstanding, ending period (in dollars per share)	$ 28.61	$ 25.67
Stock based compensation expense not yet recognized in income	$ 81,000
Weighted average remaining period for unrecognized stock based compensation	1 year 2 months 19 days