Earnings per Share - Basic and Diluted Earnings Per Share (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
Basic earnings per common share:
Net income (loss) - basic	$ 12,215	$ (2,570)	$ 42,823	$ 7,059
Weighted shares outstanding - basic (in shares)	56,656	55,898	56,465	55,639
Basic earnings (loss) per common share (in dollars per share)	$ 0.22	$ (0.05)	$ 0.76	$ 0.13
Diluted earnings per common share:
Net income (loss) - basic	$ 12,215	$ (2,570)	$ 42,823	$ 7,059
Add: Convertible Notes interest expense, net of tax	1,868	0	5,598	0
Net income (loss) - diluted	$ 14,083	$ (2,570)	$ 48,421	$ 7,059
Weighted shares outstanding - basic (in shares)	56,656	55,898	56,465	55,639
Effect of dilution from equity-based compensation awards (in shares)	624	0	660	14
Effect of dilution from if-converted Convertible Notes (in shares)	25,224	0	25,224	0
Weighted shares outstanding - diluted (in shares)	82,504	55,898	82,349	55,653
Diluted earnings (loss) per share (in dollars per share)	$ 0.17	$ (0.05)	$ 0.59	$ 0.13
Potential common shares excluded from the calculation of diluted earnings per share above, Restricted stock (in shares)	1,825	1,154	2,066	896