Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Income from continuing operations	$ 45,588	$ 140,175	$ 158,688
Loss from discontinued operations, net of tax	0	0	(77)
Net income	$ 45,588	$ 140,175	$ 158,611
Denominator:
Basic weighted-average shares (in shares)	29,758	30,548	30,353
Dilutive effect of restricted stock awards (in shares)	251	397	388
Dilutive effect of stock options (in shares)	2	8	6
Diluted weighted-average shares (in shares)	30,011	30,953	30,747
Basic income per share:
Continuing operations (in dollars per share)	$ 1.53	$ 4.59	$ 5.23
Discontinued operations (in dollars per share)	0	0	0
Total (in dollars per share)	1.53	4.59	5.23
Diluted income per share:
Continuing operations (in dollars per share)	1.52	4.53	5.16
Discontinued operations (in dollars per share)	0	0	0
Total (in dollars per share)	$ 1.52	$ 4.53	$ 5.16