Earnings Per Share - Components of Basic and Diluted (Loss) Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
(Loss) income from continuing operations	$ (324)	$ 27,208	$ 15,584	$ 88,107
Income from discontinued operations, net of tax	0	2	0	2
Net (loss) income	$ (324)	$ 27,210	$ 15,584	$ 88,109
Denominator:
Basic weighted-average shares (in shares)	29,440	30,513	29,996	30,625
Dilutive effect of restricted stock awards (in shares)	0	414	240	384
Dilutive effect of stock options (in shares)	0	8	2	8
Dilutive weighted-average shares (in shares)	29,440	30,935	30,238	31,017
Basic (loss) income per share:
Continuing operations (in USD per share)	$ (0.01)	$ 0.89	$ 0.52	$ 2.88
Discontinued operations (in USD per share)	0	0	0	0
Total (in USD per share)	(0.01)	0.89	0.52	2.88
Diluted (loss) income per share:
Continuing operations (in USD per share)	(0.01)	0.88	0.52	2.84
Discontinued operations (in USD per share)	0	0	0	0
Total (in USD per share)	$ (0.01)	$ 0.88	$ 0.52	$ 2.84