Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income	$ 33,488	$ 24,085	$ 8,473	$ 1,162	$ 57,573	$ 9,636
Denominator:
Weighted average basic shares (in shares)	11,992		11,878		11,966	11,869
Dilutive effect of restricted stock and restricted stock units (in shares)	199		271		201	240
Weighted average diluted shares (in shares)	12,191		12,149		12,167	12,109
Earnings per share:
Basic (in dollars per share)	$ 2.79		$ 0.71		$ 4.81	$ 0.81
Diluted (in dollars per share)	$ 2.75		$ 0.70		$ 4.73	$ 0.80