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)	(56,338)
Other comprehensive income	788
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
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
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)	$ 261,185
Other comprehensive income	$ 512
Ending balance (in shares) at Mar. 31, 2023	102,584,517	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	9,638,348					9,638,000
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	102,584,517	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	9,638,348					9,638,000