Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jul. 01, 2024	Dec. 31, 2022	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Basic earnings per common share:
Net Income - Basic			$ 109,613	$ 83,095	$ 38,463
Weighted shares outstanding - Basic			57,466,000	54,935,000	55,586,000
Basic earnings per common share (in dollars per share)			$ 1.91	$ 1.51	$ 0.69
Diluted earnings per common share:
Net Income - Basic			$ 109,613	$ 83,095	$ 38,463
Add: Convertible Notes interest expense, net of tax			8,792	9,947	4,327
Net Income - Diluted			$ 118,405	$ 93,042	$ 42,790
Weighted shares outstanding - basic (in shares)			57,466,000	54,935,000	55,586,000
Equity-based compensation awards - effect of dilution (in shares)			1,681,000	1,651,000	1,482,000
Convertible Notes - effect of dilution (in shares)			24,236,000	27,862,000	23,797,000
Weighted Shares Outstanding - Diluted (in shares)			83,383,000	84,448,000	80,865,000
Diluted earnings per common share (in dollars per share)			$ 1.42	$ 1.10	$ 0.53
Potential common shares excluded from the calculation of diluted earnings per share (in shares)			1,428,000	782,000	6,397,000
Gain on extinguishment of debt		$ (3,500)	$ 0	$ 0	$ (3,545)
2025 Convertible Notes
Diluted earnings per common share:
Gain on extinguishment of debt					5,400
2025 Convertible Notes | Senior Notes
Diluted earnings per common share:
Weighted average number of shares outstanding, diluted, adjustment (in shares)			3,800,000
2024 Convertible Notes | Common Class A
Diluted earnings per common share:
Debt conversion, further issued (in shares)	77,328
2024 Convertible Notes | Senior Notes
Diluted earnings per common share:
Gain on extinguishment of debt			$ 0	$ 0	$ (8,935)
Weighted average number of shares outstanding, diluted, adjustment (in shares)	883,283
Payments on debt	$ 34,400
Convertible Notes
Diluted earnings per common share:
Potential common shares excluded from the calculation of diluted earnings per share (in shares)			0	0	5,596,000
Restricted stock
Diluted earnings per common share:
Potential common shares excluded from the calculation of diluted earnings per share (in shares)			1,428,000	782,000	801,000