Earnings Per Share - Schedule of Earnings Per Share. Basic and Dilutive (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Income from continuing operations	$ 43,817	$ 54,312	$ 102,932	$ 133,885
Gain (loss) from discontinued operations, net of tax	0	12	(77)	(4)
Net income	$ 43,817	$ 54,324	$ 102,855	$ 133,881
Denominator:
Basic weighted-average shares (in shares)	30,395	30,512	30,335	30,480
Dilutive effect of restricted stock awards (in shares)	458	354	309	319
Dilutive effect of stock options (in shares)	7	6	5	7
Dilutive weighted-average shares (in shares)	30,860	30,872	30,649	30,806
Basic income per share:
Continuing operations (in USD per share)	$ 1.44	$ 1.78	$ 3.39	$ 4.39
Discontinued operations (in USD per share)	0	0	0	0
Total (in USD per share)	1.44	1.78	3.39	4.39
Diluted income per share:
Continuing operations (in USD per share)	1.42	1.76	3.36	4.35
Discontinued operations (in USD per share)	0	0	0	0
Total (in USD per share)	$ 1.42	$ 1.76	$ 3.36	$ 4.35