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	Cumulative Effect, Period of Adoption, Adjustment	[1]	Cumulative Effect, Period of Adoption, Adjustment RETAINED EARNINGS	[1]
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)	$ (5,673)		$ (5,673)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
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)	$ (5,673)		$ (5,673)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,192
Other comprehensive income, net of tax	(3,605)
Balance (in shares) at Jun. 30, 2019		82,769			35,969
Balance at Jun. 30, 2019	488,165	$ 20,692	514,639	555,780	$ (536,308)	(37,717)	(28,921)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(1,156)			(1,156)
Dividend	(3,704)			(3,704)
Shares withheld on employee taxes on vested equity awards (in shares)					3
Shares withheld on employee taxes on vested equity awards	(48)				$ (48)
Amortization of deferred compensation	507						507
Common stock acquired (in shares)					8
Common stock acquired	(82)				$ (82)
Equity awards granted, net (in shares)		48
Equity awards granted, net	0	$ 12	(12)
ESOP allocation of common stock	601		601
Stock-based compensation	3,422		3,422
Stock-based consideration	303		303
Other comprehensive income, net of tax	2,880					2,880
Balance (in shares) at Mar. 31, 2019		82,769			35,969
Balance at Mar. 31, 2019	474,284	$ 20,692	510,585	545,600	$ (536,308)	(36,682)	(29,603)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,595			13,595
Dividend	(3,415)			(3,415)
Amortization of deferred compensation	682						682
ESOP allocation of common stock	435		435
Stock-based compensation	3,332		3,332
Stock-based consideration	287		287
Other comprehensive income, net of tax	(1,035)					(1,035)
Balance (in shares) at Jun. 30, 2019		82,769			35,969
Balance at Jun. 30, 2019	488,165	$ 20,692	514,639	555,780	$ (536,308)	(37,717)	(28,921)
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)
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	33,338
Other comprehensive income, net of tax	709
Balance (in shares) at Jun. 30, 2020		83,735			36,310
Balance at Jun. 30, 2020	$ 508,455	$ 20,934	531,387	591,482	$ (543,787)	(65,207)	(26,354)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	895			895
Dividend	(3,422)			(3,422)
Shares withheld on employee taxes on vested equity awards (in shares)					261
Shares withheld on employee taxes on vested equity awards	(5,721)				$ (5,721)
Amortization of deferred compensation	629						629
Equity awards granted, net (in shares)		784
Equity awards granted, net	0	$ 196	(196)
ESOP allocation of common stock	435		435
Stock-based compensation	3,662		3,662
Stock-based consideration	117		117
Other comprehensive income, net of tax	(14,834)					(14,834)
Balance (in shares) at Mar. 31, 2020		83,741			36,310
Balance at Mar. 31, 2020	476,454	$ 20,935	526,988	573,209	$ (543,787)	(73,909)	(26,982)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,831			21,831
Dividend	(3,558)			(3,558)
Amortization of deferred compensation	628						628
Equity awards granted, net (in shares)		(6)
Equity awards granted, net	0	$ (1)	1
ESOP allocation of common stock	352		352
Stock-based compensation	3,930		3,930
Stock-based consideration	116		116
Other comprehensive income, net of tax	8,702					8,702
Balance (in shares) at Jun. 30, 2020		83,735			36,310
Balance at Jun. 30, 2020	$ 508,455	$ 20,934	$ 531,387	$ 591,482	$ (543,787)	$ (65,207)	$ (26,354)

[1] See Note 14 - Recent Accounting Pronouncements and Note 3 - Revenue for additional information.