UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance (in shares) at Sep. 30, 2022		112,222,000
Beginning balance at Sep. 30, 2022	$ 2,765,472	$ 11,222	$ 528,278	$ 2,473,572	$ (12,072)	$ (235,528)
Beginning balance (in shares) at Sep. 30, 2022						6,929,000
Increase (Decrease) in Shareholders' Equity
Net income	97,145			97,145
Other comprehensive income	256				256
Dividends declared	(76,611)			(76,611)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(9,483)		(22,776)			$ 13,293
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)						(449,000)
Stock-based compensation	8,273		8,273
Share repurchases (in shares)						844,000
Share repurchases	(39,060)					$ (39,060)
Other	(847)		(847)
Ending balance (in shares) at Dec. 31, 2022		112,222,000
Ending balance at Dec. 31, 2022	$ 2,745,145	$ 11,222	512,928	2,494,106	(11,816)	$ (261,295)
Ending balance (in shares) at Dec. 31, 2022						7,324,000
Beginning balance (in shares) at Sep. 30, 2023	99,426,526	112,222,000
Beginning balance at Sep. 30, 2023	$ 2,771,943	$ 11,222	525,369	2,707,715	(7,981)	$ (464,382)
Beginning balance (in shares) at Sep. 30, 2023	12,796,339					12,796,000
Increase (Decrease) in Shareholders' Equity
Net income	$ 95,173			95,173
Other comprehensive income	134				134
Dividends declared	(59,094)			(59,094)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(8,820)		(26,661)			$ 17,841
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)						(495,000)
Stock-based compensation	7,672		7,672
Share repurchases (in shares)						1,298,000
Share repurchases	(47,654)					$ (47,654)
Other	$ 292		292
Ending balance (in shares) at Dec. 31, 2023	98,623,747	112,222,000
Ending balance at Dec. 31, 2023	$ 2,759,646	$ 11,222	$ 506,672	$ 2,743,794	$ (7,847)	$ (494,195)
Ending balance (in shares) at Dec. 31, 2023	13,599,118					13,599,000