Earnings Per Share - Schedule of Reconciliation of Basic Shares to Diluted Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net (loss) income	$ (56,254)	$ (310,826)	$ 45,893
Denominator:
Weighted average common shares outstanding - basic	40,215	39,187	37,752
Dilutive effect of restricted stock awards			1,405
Dilutive effect of contingently issuable stock awards			132
Weighted average common shares outstanding - diluted	40,215	39,187	39,289
Net (loss) income per common share:
Basic	$ (1.4)	$ (7.93)	$ 1.22
Diluted	$ (1.4)	$ (7.93)	$ 1.17