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, 2021		112,222,000
Beginning balance at Sep. 30, 2021	$ 2,912,618	$ 11,222	$ 529,903	$ 2,573,375	$ (20,244)	$ (181,638)
Beginning balance (in shares) at Sep. 30, 2021						4,324,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(51,362)			(51,362)
Other comprehensive income	394				394
Dividends declared	(26,807)			(26,807)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(4,112)		(21,152)			$ 17,040
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)						(381,000)
Stock-based compensation	6,218		6,218
Share repurchases (in shares)						2,548,000
Share repurchases	(60,358)					$ (60,358)
Ending balance (in shares) at Dec. 31, 2021		112,222,000
Ending balance at Dec. 31, 2021	2,776,591	$ 11,222	514,969	2,495,206	(19,850)	$ (224,956)
Ending balance (in shares) at Dec. 31, 2021						6,491,000
Beginning balance (in shares) at Sep. 30, 2021		112,222,000
Beginning balance at Sep. 30, 2021	2,912,618	$ 11,222	529,903	2,573,375	(20,244)	$ (181,638)
Beginning balance (in shares) at Sep. 30, 2021						4,324,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(38,586)
Other comprehensive income	1,177
Ending balance (in shares) at Jun. 30, 2022		112,222,000
Ending balance at Jun. 30, 2022	2,732,668	$ 11,222	521,439	2,454,726	(19,067)	$ (235,652)
Ending balance (in shares) at Jun. 30, 2022						6,932,000
Beginning balance (in shares) at Dec. 31, 2021		112,222,000
Beginning balance at Dec. 31, 2021	2,776,591	$ 11,222	514,969	2,495,206	(19,850)	$ (224,956)
Beginning balance (in shares) at Dec. 31, 2021						6,491,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(4,976)			(4,976)
Other comprehensive income	394				394
Dividends declared	(26,565)			(26,565)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(1,392)		(7,197)			$ 5,805
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)						(161,000)
Stock-based compensation	7,945		7,945
Share repurchases (in shares)						607,000
Share repurchases	(16,641)					$ (16,641)
Other	(946)		(946)
Ending balance (in shares) at Mar. 31, 2022		112,222,000
Ending balance at Mar. 31, 2022	2,734,410	$ 11,222	514,771	2,463,665	(19,456)	$ (235,792)
Ending balance (in shares) at Mar. 31, 2022						6,937,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	17,752			17,752
Other comprehensive income	389				389
Dividends declared	(26,691)			(26,691)
Vesting of restricted stock awards, net of shares withheld for employee taxes	4		(136)			$ 140
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)						(5,000)
Stock-based compensation	7,051		7,051
Other	(247)		(247)
Ending balance (in shares) at Jun. 30, 2022		112,222,000
Ending balance at Jun. 30, 2022	$ 2,732,668	$ 11,222	521,439	2,454,726	(19,067)	$ (235,652)
Ending balance (in shares) at Jun. 30, 2022						6,932,000
Beginning balance (in shares) at Sep. 30, 2022	105,293,662	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	6,929,203					6,929,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	$ 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, 2022	105,293,662	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	6,929,203					6,929,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	$ 356,478
Other comprehensive income	$ 767
Ending balance (in shares) at Jun. 30, 2023	99,426,526	112,222,000
Ending balance at Jun. 30, 2023	$ 2,708,081	$ 11,222	517,259	2,655,287	(11,305)	$ (464,382)
Ending balance (in shares) at Jun. 30, 2023	12,796,339					12,796,000
Beginning balance (in shares) at Dec. 31, 2022		112,222,000
Beginning balance at Dec. 31, 2022	$ 2,745,145	$ 11,222	512,928	2,494,106	(11,816)	$ (261,295)
Beginning balance (in shares) at Dec. 31, 2022						7,324,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	164,040			164,040
Other comprehensive income	256				256
Dividends declared	(50,046)			(50,046)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(4,927)		(11,769)			$ 6,842
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)						(229,000)
Stock-based compensation	7,431		7,431
Share repurchases (in shares)						2,543,000
Share repurchases	(106,708)					$ (106,708)
Other	615		615
Ending balance (in shares) at Mar. 31, 2023		112,222,000
Ending balance at Mar. 31, 2023	2,755,806	$ 11,222	509,205	2,608,100	(11,560)	$ (361,161)
Ending balance (in shares) at Mar. 31, 2023						9,638,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)	95,293			95,293
Other comprehensive income	255				255
Dividends declared	(48,106)			(48,106)
Stock-based compensation	8,180		8,180
Share repurchases (in shares)						3,158,000
Share repurchases	(103,221)					$ (103,221)
Other	$ (126)		(126)
Ending balance (in shares) at Jun. 30, 2023	99,426,526	112,222,000
Ending balance at Jun. 30, 2023	$ 2,708,081	$ 11,222	$ 517,259	$ 2,655,287	$ (11,305)	$ (464,382)
Ending balance (in shares) at Jun. 30, 2023	12,796,339					12,796,000