CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Deferred Compensation [Member]
Balance at Sep. 30, 2013	$ 650,464	$ 19,404	$ 494,412	$ 434,363	$ (274,602)	$ (3,339)	$ (19,774)
Balance (in Shares) at Sep. 30, 2013		77,616,000			18,527,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(177)			(177)
Dividends	(6,273)			(6,273)
Tax effect from exercise/vesting of equity awards, net	273		273
Amortization of deferred compensation	2,457						2,457
Common stock issued	584	$ 11	573
Common stock issued (in Shares)		44,000
Common stock acquired	(79,614)				$ (79,614)
Common stock acquired (in Shares)					6,808,000
Equity awards granted, net	(152)	$ 206	(358)
Equity awards granted, net (in Shares)		824,000
ESOP purchase of common stock	(20,000)						(20,000)
ESOP allocation of common stock	(283)		(283)
Stock-based compensation	11,473		11,473
Other comprehensive income (loss), net of taxes	(26,725)					(26,725)
Balance at Sep. 30, 2014	532,027	$ 19,621	506,090	427,913	$ (354,216)	(30,064)	(37,317)
Balance (in Shares) at Sep. 30, 2014		78,484,000			25,335,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	34,289			34,289
Dividends	(7,654)			(7,654)
Tax effect from exercise/vesting of equity awards, net	345		345
Amortization of deferred compensation	2,786						2,786
Common stock issued	371	$ 17	354
Common stock issued (in Shares)		69,000
Common stock acquired	(82,343)				$ (82,343)
Common stock acquired (in Shares)					5,402,000
Equity awards granted, net	(252)	$ 132	(384)
Equity awards granted, net (in Shares)		527,000
ESOP allocation of common stock	970		970
Stock-based compensation	11,110		11,110
Other comprehensive income (loss), net of taxes	(61,124)					(61,124)
Balance at Sep. 30, 2015	430,525	$ 19,770	518,485	454,548	$ (436,559)	(91,188)	(34,531)
Balance (in Shares) at Sep. 30, 2015		79,080,000			30,737,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	30,010			30,010
Dividends	(8,798)			(8,798)
Amortization of deferred compensation	2,853						2,853
Common stock issued		$ 10	(10)
Common stock issued (in Shares)		41,000
Common stock acquired	$ (65,307)				$ (65,307)
Common stock acquired (in Shares)	15,855,854				4,060,000
Equity awards granted, net	$ 264	$ 212	52
Equity awards granted, net (in Shares)		845,000
ESOP allocation of common stock	1,317		1,317
Stock-based compensation	10,136		10,136
Other comprehensive income (loss), net of taxes	9,947					9,947
Balance at Sep. 30, 2016	$ 410,947	$ 19,992	$ 529,980	$ 475,760	$ (501,866)	$ (81,241)	$ (31,678)
Balance (in Shares) at Sep. 30, 2016		79,966,000			34,797,000