CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - 9 months ended Jun. 30, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	CAPITAL INEXCESS OFPAR VALUE [Member]	RETAINED EARNINGS [Member]	TREASURY SHARES [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]	DEFERRED COMPENSATION [Member]
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			34,797
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,862			26,862
Dividend	(7,766)			(7,766)
Shares withheld on employee taxes on vested equity awards			(97)
Shares withheld on employee taxes on vested equity awards					(584)
Shares withheld on employee taxes on vested equity awards	(13,692)				$ (13,595)
Amortization of deferred compensation	2,635						2,635
Common stock issued (shares)		3
Common stock issued	22	$ 0	22
Common stock acquired	(2,201)				$ (2,201)
Common stock acquired (in Shares)					129
Stock grants and equity awards, net (in Shares)		844
Equity awards granted, net	0	$ 211	(211)
Premium on settlement of convertible debt	(73,855)		(73,855)
Issuance of treasury stock in settlement of convertible debt	48,858		20,375		$ 28,483
Issuance of treasury stock in settlement of convertible debt (in shares)					(1,955)
ESOP purchase of common stock	10,908						10,908
ESOP allocation of common stock	2,209		2,209
Stock-based compensation	7,200		7,200
Other comprehensive income, net of tax	3,777					3,777
Balance at Jun. 30, 2017	$ 394,088	$ 20,203	$ 485,623	$ 494,856	$ (489,179)	$ (77,464)	$ (39,951)
Balance (in Shares) at Jun. 30, 2017		80,813			33,555