EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Numerator [Abstract]
Net income (loss)	$ 13,443	$ (3,083)
Less: income attributable to participating securities	0	11
Earnings available to common shares	$ 13,443	$ (3,072)
Denominator [Abstract]
Weighted-average common shares (Denominator for basic calculation) (in shares)	27,156,882	25,325,757
Weighted average effect of dilutive securities [Abstract]
Share-based compensation (in shares)	604,954	0
Diluted weighted average common shares (Denominator for diluted calculation) (in shares)	27,761,836	25,325,757
Earnings per share [Abstract]
Basic (in dollars per share)	$ 0.50	$ (0.12)
Diluted (in dollars per share)	$ 0.48	$ (0.12)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Outstanding stock options excluded from diluted earnings (in shares)	200,000	0