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Earnings Per Share - Calculations of Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share And Equity [Abstract]
Net income	$ 19,394	$ (11,135)	$ 2,372	$ 22,624	$ 5,482	$ 15,432	$ 5,304	$ 6,610	$ 33,255	$ 32,828	$ 14,920
Basic weighted average common shares outstanding									13,516	10,919	9,558
Add: Incremental shares for:
Dilutive effect of warrants									11,492	12,369	14,451
Dilutive effect of restricted stock									163	98	73
Diluted weighted average common shares outstanding									25,171	23,386	24,082
Net income per common share
Basic	$ 1.04	$ (0.89)	$ 0.20	$ 2.00	$ 0.49	$ 1.40	$ 0.48	$ 0.62	$ 2.46	$ 3.01	$ 1.56
Diluted	$ 0.65	$ (0.89)	$ 0.10	$ 0.96	$ 0.23	$ 0.66	$ 0.23	$ 0.28	$ 1.32	$ 1.40	$ 0.62

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