Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Basic earnings per common share:
Net income - basic	$ 28,470	$ 16,778
Weighted shares outstanding - basic (in shares)	55,076	56,308
Basic earnings per common share (in dollars per share)	$ 0.52	$ 0.30
Diluted earnings per common share:
Net income - basic	$ 28,470	$ 16,778
Add: Convertible Notes expense, net of tax	2,659	4,540
Net income - diluted	$ 31,129	$ 21,318
Weighted shares outstanding - basic (in shares)	55,076	56,308
Equity-based compensation awards - effect of dilution (in shares)	1,318	1,118
Convertible Notes - effect of dilution (in shares)	30,418	26,353
Weighted shares outstanding - diluted (in shares)	86,812	83,779
Diluted earnings per common share (in dollars per share)	$ 0.36	$ 0.25
Loss on extinguishment of debt	$ 0	$ 3,545
2025 Convertible Notes
Diluted earnings per common share:
Loss on extinguishment of debt		$ 3,500
Restricted stock
Diluted earnings per common share:
Potential common shares excluded from the calculation of diluted earnings per common share above (in shares)	1,581	1,552