CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	COMMON STOCK	CAPITAL IN EXCESS OF PAR VALUE	RETAINED EARNINGS	TREASURY SHARES	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	DEFERRED COMPENSATION
Beginning balance (in shares) at Sep. 30, 2022		84,746
Balance at Sep. 30, 2022	$ 477,570	$ 21,187	$ 627,982	$ 344,060	$ (420,116)	$ (82,738)	$ (12,805)
Beginning balance (in shares) at Sep. 30, 2022					27,682
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	48,702			48,702
Dividend	(6,145)			(6,145)
Shares withheld on employee taxes on vested equity awards (in shares)					345
Shares withheld on employee taxes on vested equity awards	(12,734)				$ (12,734)
Amortization of deferred compensation	571						571
Equity awards granted, net (in shares)					(467)
Equity awards granted, net	0		(7,082)		$ 7,082
ESOP allocation of common stock	1,127		1,127
Stock-based compensation	5,538		5,538
Other comprehensive income, net of tax	12,219					12,219
Ending balance (in shares) at Dec. 31, 2022		84,746
Balance at Dec. 31, 2022	526,848	$ 21,187	627,565	386,617	$ (425,768)	(70,519)	(12,234)
Ending balance (in shares) at Dec. 31, 2022					27,560
Beginning balance (in shares) at Sep. 30, 2022		84,746
Balance at Sep. 30, 2022	477,570	$ 21,187	627,982	344,060	$ (420,116)	(82,738)	(12,805)
Beginning balance (in shares) at Sep. 30, 2022					27,682
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(13,553)
Other comprehensive income, net of tax	14,832
Ending balance (in shares) at Mar. 31, 2023		84,746
Balance at Mar. 31, 2023	468,311	$ 21,187	633,451	318,648	$ (425,405)	(67,906)	(11,664)
Ending balance (in shares) at Mar. 31, 2023					27,541
Beginning balance (in shares) at Dec. 31, 2022		84,746
Balance at Dec. 31, 2022	526,848	$ 21,187	627,565	386,617	$ (425,768)	(70,519)	(12,234)
Beginning balance (in shares) at Dec. 31, 2022					27,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(62,255)			(62,255)
Dividend	(5,714)			(5,714)
Shares withheld on employee taxes on vested equity awards (in shares)					21
Shares withheld on employee taxes on vested equity awards	(254)				$ (254)
Amortization of deferred compensation	570						570
Equity awards granted, net (in shares)					(40)
Equity awards granted, net	0		(617)		$ 617
ESOP allocation of common stock	1,207		1,207
Stock-based compensation	5,296		5,296
Other comprehensive income, net of tax	2,613					2,613
Ending balance (in shares) at Mar. 31, 2023		84,746
Balance at Mar. 31, 2023	468,311	$ 21,187	633,451	318,648	$ (425,405)	(67,906)	(11,664)
Ending balance (in shares) at Mar. 31, 2023					27,541
Beginning balance (in shares) at Sep. 30, 2023		84,746
Balance at Sep. 30, 2023	315,244	$ 21,187	662,680	281,516	$ (577,686)	(70,010)	(2,443)
Beginning balance (in shares) at Sep. 30, 2023					31,684
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	42,177			42,177
Dividend	(7,825)			(7,825)
Shares withheld on employee taxes on vested equity awards (in shares)					221
Shares withheld on employee taxes on vested equity awards	(11,604)				$ (11,604)
Amortization of deferred compensation	520						520
Common stock acquired (in shares)					1,634
Common stock acquired	(70,543)				$ (70,543)
Equity awards granted, net (in shares)					(180)
Equity awards granted, net	0		(3,383)		$ 3,383
ESOP allocation of common stock	1,550		1,550
Stock-based compensation	5,028		5,028
Other comprehensive income, net of tax	10,475					10,475
Ending balance (in shares) at Dec. 31, 2023		84,746
Balance at Dec. 31, 2023	285,022	$ 21,187	665,875	315,868	$ (656,450)	(59,535)	(1,923)
Ending balance (in shares) at Dec. 31, 2023					33,359
Beginning balance (in shares) at Sep. 30, 2023		84,746
Balance at Sep. 30, 2023	315,244	$ 21,187	662,680	281,516	$ (577,686)	(70,010)	(2,443)
Beginning balance (in shares) at Sep. 30, 2023					31,684
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	106,320
Other comprehensive income, net of tax	5,579
Ending balance (in shares) at Mar. 31, 2024		84,746
Balance at Mar. 31, 2024	202,186	$ 21,187	662,689	372,722	$ (788,644)	(64,431)	(1,337)
Ending balance (in shares) at Mar. 31, 2024					35,109
Beginning balance (in shares) at Dec. 31, 2023		84,746
Balance at Dec. 31, 2023	285,022	$ 21,187	665,875	315,868	$ (656,450)	(59,535)	(1,923)
Beginning balance (in shares) at Dec. 31, 2023					33,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	64,143			64,143
Dividend	(7,289)			(7,289)
Shares withheld on employee taxes on vested equity awards (in shares)					375
Shares withheld on employee taxes on vested equity awards	(22,722)				$ (22,722)
Amortization of deferred compensation	586						586
Common stock acquired (in shares)					1,803
Common stock acquired	(118,964)				$ (118,964)
Equity awards granted, net (in shares)					(428)
Equity awards granted, net	0		(9,492)		$ 9,492
ESOP allocation of common stock	2,484		2,484
Stock-based compensation	3,849		3,849
SEC filing fees	(27)		(27)
Other comprehensive income, net of tax	(4,896)					(4,896)
Ending balance (in shares) at Mar. 31, 2024		84,746
Balance at Mar. 31, 2024	$ 202,186	$ 21,187	$ 662,689	$ 372,722	$ (788,644)	$ (64,431)	$ (1,337)
Ending balance (in shares) at Mar. 31, 2024					35,109