STOCK COMPENSATION (Details) - USD ($)	6 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Number of Shares
Options outstanding, beginning of period (in shares)	155,961
Granted (in shares)	0
Exercised (in shares)	(45,132)
Forfeited or expired (in shares)	(3,027)
Options outstanding, end of period (in shares)	107,802	155,961
Options exercisable, end of period (in shares)	107,802
Weighted Average Exercise Price
Options outstanding, beginning of period (in dollars per share)	$ 8.48
Granted (in dollars per share)	0
Exercised (in dollars per share)	8.95
Forfeited or expired (in dollars per share)	10.60
Options outstanding, end of period (in dollars per share)	8.23	$ 8.48
Options exercisable, end of period (in dollars per share)	$ 8.23
Weighted Average Remaining Contractual Term
Options outstanding	1 year 5 months 19 days	1 year 9 months 11 days
Options exercisable	1 year 5 months 19 days
Aggregate Intrinsic Value
Options outstanding, beginning of period	$ 2,974,000
Granted	0
Exercised	742,000
Forfeited or expired	33,000
Options outstanding, end of period	1,235,000	$ 2,974,000
Options exercisable, end of period	$ 1,235,000
Number of Shares
Nonvested shares outstanding, beginning of period (in shares)	1,005,813
Granted (in shares)	296,302
Vested (in shares)	(347,354)
Forfeited or expired (in shares)	(1,623)
Nonvested shares outstanding, end of period (in shares)	953,138	1,005,813
Weighted Average Fair Value at Grant
Nonvested shares outstanding, beginning of period (in dollars per share)	$ 29.89
Granted (in dollars per share)	24.84
Vested (in dollars per share)	26.78
Forfeited or expired (in dollars per share)	26.17
Nonvested shares outstanding, end of period (in dollars per share)	$ 29.46	$ 29.89
Stock based compensation expense not yet recognized in income	$ 15,800,000
Weighted average remaining period for unrecognized stock based compensation	3 years 1 month 10 days