Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic earnings per common share:
Net income - basic		$ 18,222	$ 12,215	$ 28,210	$ 42,823
Weighted shares outstanding - basic (in shares)		55,367	56,656	55,776	56,465
Basic earnings per common share (in dollars per share)		$ 0.33	$ 0.22	$ 0.51	$ 0.76
Diluted earnings per common share:
Net income - basic		$ 18,222	$ 12,215	$ 28,210	$ 42,823
Add: Convertible Notes interest expense, net of tax		2,644	1,868	1,885	5,598
Net income - diluted		$ 20,866	$ 14,083	$ 30,095	$ 48,421
Weighted shares outstanding - basic (in shares)		55,367	56,656	55,776	56,465
Equity-based compensation awards - effect of dilution (in shares)		1,041	624	1,058	660
Convertible Notes - effect of dilution (in shares)		30,417	25,224	22,725	25,224
Weighted shares outstanding - diluted (in shares)		86,825	82,504	79,559	82,349
Diluted earnings per common share (in dollars per share)		$ 0.24	$ 0.17	$ 0.38	$ 0.59
Potential common shares excluded from the calculation of diluted earnings per common share above (in shares)		1,705	1,825	8,051	2,066
Gain (loss) on extinguishment of debt	$ (3,500)			$ (3,545)	$ 0
2025 Convertible Notes
Diluted earnings per common share:
Gain (loss) on extinguishment of debt				$ 5,400
Convertible Notes
Diluted earnings per common share:
Potential common shares excluded from the calculation of diluted earnings per common share above (in shares)		0	0	6,323	0
Restricted stock
Diluted earnings per common share:
Potential common shares excluded from the calculation of diluted earnings per common share above (in shares)		1,705	1,825	1,728	2,066