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, 2022	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net (loss) income	$ (310,826)	$ 45,893	$ (18,316)
Denominator:
Weighted average common shares outstanding - basic	39,187	37,752	36,428
Dilutive effect of restricted stock awards		1,405
Dilutive effect of contingently issuable stock awards		132
Weighted average common shares outstanding - diluted	39,187	39,289	36,428
Net (loss) income per common share:
Basic	$ (7.93)	$ 1.22	$ (0.50)
Diluted	$ (7.93)	$ 1.17	$ (0.50)