Earnings Per Share - Schedule of Reconciliation of Basic Shares to Diluted Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net (loss) income	$ (476)	$ 11,163	$ 18,568	$ 32,104
Interest on Convertible Senior Notes, net of tax				3,614
Net (loss) income - diluted	$ (476)	$ 11,163	$ 18,568	$ 35,718
Denominator:
Weighted average common shares outstanding - basic	39,189	37,743	39,013	37,583
Dilutive effect of restricted stock awards		1,434	573	1,470
Dilutive effect of the Convertible Senior Notes				4,677
Weighted average common shares outstanding - diluted	39,189	39,177	39,586	43,730
Net (loss) income per common share:
Basic	$ (0.01)	$ 0.30	$ 0.48	$ 0.85
Diluted	$ (0.01)	$ 0.28	$ 0.47	$ 0.82