UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance (in shares) at Sep. 30, 2020			112,151,000
Beginning balance (in shares) at Sep. 30, 2020								4,663,000
Beginning balance at Sep. 30, 2020	$ 3,318,514	$ (1,251)	$ 11,215	$ 521,628	$ 3,010,012	$ (1,251)	$ (26,188)	$ (198,153)
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(70,431)				(70,431)
Other comprehensive income	457						457
Dividends declared	(27,324)				(27,324)
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)			72,000					(295,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(2,117)		$ 7	(16,742)				$ 14,618
Stock-based compensation	7,451			7,451
Other	(381)			(381)
Ending balance (in shares) at Dec. 31, 2020			112,223,000
Ending balance (in shares) at Dec. 31, 2020								4,368,000
Ending balance at Dec. 31, 2020	3,224,918		$ 11,222	511,956	2,911,006		(25,731)	$ (183,535)
Beginning balance (in shares) at Sep. 30, 2020			112,151,000
Beginning balance (in shares) at Sep. 30, 2020								4,663,000
Beginning balance at Sep. 30, 2020	3,318,514	$ (1,251)	$ 11,215	521,628	3,010,012	$ (1,251)	(26,188)	$ (198,153)
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(246,989)
Other comprehensive income	1,374
Ending balance (in shares) at Jun. 30, 2021			112,223,000
Ending balance (in shares) at Jun. 30, 2021								4,324,000
Ending balance at Jun. 30, 2021	3,007,907		$ 11,222	523,281	2,679,859		(24,814)	$ (181,641)
Beginning balance (in shares) at Dec. 31, 2020			112,223,000
Beginning balance (in shares) at Dec. 31, 2020								4,368,000
Beginning balance at Dec. 31, 2020	3,224,918		$ 11,222	511,956	2,911,006		(25,731)	$ (183,535)
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(121,003)				(121,003)
Other comprehensive income	457						457
Dividends declared	(27,268)				(27,268)
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)								(39,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes	0			(1,678)				$ 1,678
Stock-based compensation	6,826			6,826
Other	(234)			(234)
Ending balance (in shares) at Mar. 31, 2021			112,223,000
Ending balance (in shares) at Mar. 31, 2021								4,329,000
Ending balance at Mar. 31, 2021	3,083,696		$ 11,222	516,870	2,762,735		(25,274)	$ (181,857)
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(55,555)				(55,555)
Other comprehensive income	460						460
Dividends declared	(27,321)				(27,321)
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)								(5,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(41)			(257)				$ 216
Stock-based compensation	6,963			6,963
Other	(295)			(295)
Ending balance (in shares) at Jun. 30, 2021			112,223,000
Ending balance (in shares) at Jun. 30, 2021								4,324,000
Ending balance at Jun. 30, 2021	$ 3,007,907		$ 11,222	523,281	2,679,859		(24,814)	$ (181,641)
Beginning balance (in shares) at Sep. 30, 2021	107,898,859		112,222,000
Beginning balance (in shares) at Sep. 30, 2021	4,324,006							4,324,000
Beginning balance at Sep. 30, 2021	$ 2,912,618		$ 11,222	529,903	2,573,375		(20,244)	$ (181,638)
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 (in shares)								(381,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(4,112)			(21,152)				$ 17,040
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 (in shares) at Dec. 31, 2021								6,491,000
Ending balance at Dec. 31, 2021	$ 2,776,591		$ 11,222	514,969	2,495,206		(19,850)	$ (224,956)
Beginning balance (in shares) at Sep. 30, 2021	107,898,859		112,222,000
Beginning balance (in shares) at Sep. 30, 2021	4,324,006							4,324,000
Beginning balance at Sep. 30, 2021	$ 2,912,618		$ 11,222	529,903	2,573,375		(20,244)	$ (181,638)
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(38,586)
Other comprehensive income	$ 1,177
Ending balance (in shares) at Jun. 30, 2022	105,290,017		112,222,000
Ending balance (in shares) at Jun. 30, 2022	6,932,848							6,932,000
Ending balance at Jun. 30, 2022	$ 2,732,668		$ 11,222	521,439	2,454,726		(19,067)	$ (235,652)
Beginning balance (in shares) at Dec. 31, 2021			112,222,000
Beginning balance (in shares) at Dec. 31, 2021								6,491,000
Beginning balance at Dec. 31, 2021	2,776,591		$ 11,222	514,969	2,495,206		(19,850)	$ (224,956)
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 (in shares)								(161,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes	(1,392)			(7,197)				$ 5,805
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 (in shares) at Mar. 31, 2022								6,937,000
Ending balance at Mar. 31, 2022	2,734,410		$ 11,222	514,771	2,463,665		(19,456)	$ (235,792)
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 (in shares)								(5,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes	4			(136)				$ 140
Stock-based compensation	7,051			7,051
Other	$ (247)			(247)
Ending balance (in shares) at Jun. 30, 2022	105,290,017		112,222,000
Ending balance (in shares) at Jun. 30, 2022	6,932,848							6,932,000
Ending balance at Jun. 30, 2022	$ 2,732,668		$ 11,222	$ 521,439	$ 2,454,726		$ (19,067)	$ (235,652)