Earnings Per Share - Schedule of Earnings Per Share. Basic and Dilutive (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Income from continuing operations	$ 39,171	$ 34,707	$ 60,899	$ 59,115
Loss from discontinued operations, net of tax	0	0	0	(77)
Net income	$ 39,171	$ 34,707	$ 60,899	$ 59,038
Denominator:
Basic weighted-average shares (in shares)	30,769	30,394	30,681	30,464
Dilutive effect of restricted stock awards (in shares)	357	211	375	234
Dilutive effect of stock options (in shares)	7	5	8	4
Dilutive weighted-average shares (in shares)	31,133	30,610	31,064	30,702
Basic income per share:
Continuing operations (in USD per share)	$ 1.27	$ 1.14	$ 1.98	$ 1.94
Discontinued operations (in USD per share)	0	0	0	0
Total (in USD per share)	1.27	1.14	1.98	1.94
Diluted income per share:
Continuing operations (in USD per share)	1.26	1.13	1.96	1.93
Discontinued operations (in USD per share)	0	0	0	0
Total (in USD per share)	$ 1.26	$ 1.13	$ 1.96	$ 1.93