Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 26,436	$ 18,454	$ 8,473	$ 1,162	$ 8,739	$ 9,061	$ (1,217)	$ (2,846)	$ 54,525	$ 13,737	$ 631
Denominator:
Weighted average basic shares (in shares)									11,879	11,797	11,705
Dilutive effect of restricted stock units (in shares)									241	146	84
Weighted average diluted shares (in shares)									12,120	11,943	11,789
Earnings per share:
Basic (in dollars per share)	$ 2.22	$ 1.55	$ 0.71	$ 0.10	$ 0.74	$ 0.77	$ (0.10)	$ (0.24)	$ 4.59	$ 1.16	$ 0.05
Diluted (in dollars per share)	$ 2.17	$ 1.52	$ 0.70	$ 0.10	$ 0.73	$ 0.76	$ (0.10)	$ (0.24)	$ 4.50	$ 1.15	$ 0.05