STOCK COMPENSATION - Narrative and Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Effect to income of share-based compensation expense, net of tax benefits [Abstract]
Total employee stock-based compensation expense recognized in income, net of tax effects of $3,907, $192, and $66, respectively	$ 9,716	$ 7,878	$ 6,486
Tax effects of employee's stock-based compensation expense recognized income	3,230	$ 3,139	$ 3,907
Stock based compensation expense not yet recognized in income	$ 11,900
Weighted average remaining period for unrecognized stock based compensation	3 years 25 days
Period that options are issued	10 years
Percentage of options vesting at either grant date or over four year period	100.00%
Period that options vest	4 years
Granted (in shares)	0	0
Fair value of share granted (in shares)	315,802	354,108
Award vesting	P8Y
Director
Effect to income of share-based compensation expense, net of tax benefits [Abstract]
Fair value of share granted (in shares)	1,000,000.0	1,100,000	500,000