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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Income from continuing operations	$ 54,312	$ 37,142	$ 133,885	$ 73,821
Income (loss) from discontinued operations, net of tax	12	(7)	(4)	(161)
Net income	$ 54,324	$ 37,135	$ 133,881	$ 73,660
Denominator:
Basic weighted-average shares (in shares)	30,512	30,022	30,480	29,915
Dilutive effect of restricted stock awards (in shares)	354	517	319	352
Dilutive effect of stock options (in shares)	6	23	7	25
Dilutive weighted-average shares (in shares)	30,872	30,562	30,806	30,292
Basic income (loss) per share:
Continuing operations (in USD per share)	$ 1.78	$ 1.24	$ 4.39	$ 2.47
Discontinued operations (in USD per share)	0	0	0	(0.01)
Total (in USD per share)	1.78	1.24	4.39	2.46
Diluted income (loss) per share:
Continuing operations (in USD per share)	1.76	1.22	4.35	2.44
Discontinued operations (in USD per share)	0	0	0	(0.01)
Total (in USD per share)	$ 1.76	$ 1.22	$ 4.35	$ 2.43