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
Balance (in shares) at Sep. 30, 2018		81,520			35,846
Balance at Sep. 30, 2018	$ 474,391	$ 20,380	$ 503,396	$ 550,523	$ (534,830)	$ (34,112)	$ (30,966)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,753			8,753
Dividend	(3,143)			(3,143)
Shares withheld on employee taxes on vested equity awards (in shares)					83
Shares withheld on employee taxes on vested equity awards	(1,058)				$ (1,058)
Amortization of deferred compensation	856						856
Common stock acquired (in shares)					29
Common stock acquired	(290)				$ (290)
Equity awards granted, net (in shares)		1,201
Equity awards granted, net	0	$ 300	(300)
ESOP allocation of common stock	(8)		(8)
Stock-based compensation	2,933		2,933
Stock-based consideration	250		250
Other comprehensive income, net of tax	(5,450)					(5,450)
Balance (in shares) at Dec. 31, 2018		82,721			35,958
Balance at Dec. 31, 2018	471,561	$ 20,680	506,271	550,460	$ (536,178)	(39,562)	(30,110)
Balance (in shares) at Sep. 30, 2019		82,775			35,969
Balance at Sep. 30, 2019	477,763	$ 20,694	519,017	568,516	$ (536,308)	(65,916)	(28,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,612			10,612
Dividend	(3,392)			(3,392)
Shares withheld on employee taxes on vested equity awards (in shares)					80
Shares withheld on employee taxes on vested equity awards	(1,758)				$ (1,758)
Amortization of deferred compensation	629						629
Equity awards granted, net (in shares)		182
Equity awards granted, net	0	$ 45	(45)
ESOP allocation of common stock	609		609
Stock-based compensation	3,150		3,150
Stock-based consideration	239		239
Other comprehensive income, net of tax	6,841					6,841
Balance (in shares) at Dec. 31, 2019		82,957			36,049
Balance at Dec. 31, 2019	$ 494,693	$ 20,739	$ 522,970	$ 575,736	$ (538,066)	$ (59,075)	$ (27,611)