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, 2021		84,375
Beginning balance (in shares) at Sep. 30, 2021					27,762
Balance at Sep. 30, 2021	$ 807,158	$ 21,094	$ 602,181	$ 669,998	$ (416,850)	$ (45,977)	$ (23,288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,298			19,298
Dividend	(4,739)			(4,739)
Shares withheld on employee taxes on vested equity awards (in shares)					422
Shares withheld on employee taxes on vested equity awards	(10,886)				$ (10,886)
Amortization of deferred compensation	591						591
Equity awards granted, net (in shares)		113			0
Equity awards granted, net	0	$ 28	(28)
ESOP allocation of common stock	848		848
Stock-based compensation	2,866		2,866
Other comprehensive income, net of tax	(2,751)					(2,751)
Ending balance (in shares) at Dec. 31, 2021		84,488
Ending balance (in shares) at Dec. 31, 2021					28,184
Balance at Dec. 31, 2021	812,385	$ 21,122	605,867	684,557	$ (427,736)	(48,728)	(22,697)
Beginning balance (in shares) at Sep. 30, 2022		84,746
Beginning balance (in shares) at Sep. 30, 2022					27,682
Balance at Sep. 30, 2022	477,570	$ 21,187	627,982	344,060	$ (420,116)	(82,738)	(12,805)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,702			48,702
Dividend	(6,145)			(6,145)
Shares withheld on employee taxes on vested equity awards (in shares)					333
Shares withheld on employee taxes on vested equity awards	(12,734)		(180)		$ (12,554)
Amortization of deferred compensation	571						571
Equity awards granted, net (in shares)		0			(455)
Equity awards granted, net	0	$ 0	(6,902)		$ 6,902
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
Ending balance (in shares) at Dec. 31, 2022					27,560
Balance at Dec. 31, 2022	$ 526,848	$ 21,187	$ 627,565	$ 386,617	$ (425,768)	$ (70,519)	$ (12,234)