CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - 3 months ended Dec. 31, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	COMMON STOCK [Member]	CAPITAL INEXCESS OF PAR VALUE [Member]	RETAINED EARNINGS [Member]	TREASURY SHARES [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]	DEFERRED COMPENSATION [Member]
Balance at Sep. 30, 2017	$ 398,808	$ 20,166	$ 487,077	$ 480,347	$ (489,225)	$ (60,481)	$ (39,076)
Balance (in Shares) at Sep. 30, 2017		80,663			33,557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,989			30,989
Dividend	(2,990)			(2,990)
Shares withheld on employee taxes on vested equity awards			0
Shares withheld on employee taxes on vested equity awards					191
Shares withheld on employee taxes on vested equity awards	(4,332)				$ (4,332)
Amortization of deferred compensation	817						817
Equity awards granted, net (in shares)		895
Equity awards granted, net	0	$ 223	(223)
ESOP allocation of common stock	608		608
Stock-based compensation	2,555		2,555
Other comprehensive income, net of tax	8,358					8,358
Balance at Dec. 31, 2017	$ 434,813	$ 20,389	$ 490,017	$ 508,346	$ (493,557)	$ (52,123)	$ (38,259)
Balance (in Shares) at Dec. 31, 2017		81,558			33,748