Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance, value at Sep. 30, 2011	$ 822,690	$ 1,169	$ 1,805,021	$ (918,736)	$ (64,764)
Balance, shares at Sep. 30, 2011		116,937
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for employee stock-based awards, shares		5,077
Common stock issued for employee stock-based awards, value	21,210	51	21,159
Shares surrendered by employees to pay taxes related to stock-based awards, shares		(908)
Shares surrendered by employees to pay taxes related to stock-based awards, value	(20,967)	(9)	(20,958)
Compensation expense from stock-based awards	51,305		51,305
Excess tax benefits (tax shortfalls) from stock-based awards	1,109		1,109
Net income (loss)	(35,398)			(35,398)
Repurchases of common stock, shares	(1,553)	(1,553)
Repurchases of common stock, value	(34,953)	(15)	(34,938)
Foreign currency translation adjustment	(2,176)				(2,176)
Change in pension benefits, net of tax	(5,561)				(5,561)
Balance, value at Sep. 30, 2012	797,259	1,196	1,822,698	(954,134)	(72,501)
Balance, shares at Sep. 30, 2012		119,553
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for employee stock-based awards, shares		2,655
Common stock issued for employee stock-based awards, value	4,884	27	4,857
Shares surrendered by employees to pay taxes related to stock-based awards, shares		(709)
Shares surrendered by employees to pay taxes related to stock-based awards, value	(14,996)	(7)	(14,989)
Compensation expense from stock-based awards	48,787		48,787
Excess tax benefits (tax shortfalls) from stock-based awards	307		307
Net income (loss)	143,769			143,769
Repurchases of common stock, shares	(3,053)	(3,053)
Repurchases of common stock, value	(74,871)	(31)	(74,840)
Foreign currency translation adjustment	7,165				7,165
Change in pension benefits, net of tax	14,176				14,176
Balance, value at Sep. 30, 2013	926,480	1,185	1,786,820	(810,365)	(51,160)
Balance, shares at Sep. 30, 2013	118,446	118,446
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for employee stock-based awards, shares		2,455
Common stock issued for employee stock-based awards, value	877	24	853
Shares surrendered by employees to pay taxes related to stock-based awards, shares		(808)
Shares surrendered by employees to pay taxes related to stock-based awards, value	(26,857)	(8)	(26,849)
Compensation expense from stock-based awards	50,889		50,889
Excess tax benefits (tax shortfalls) from stock-based awards	10,428		10,428
Net income (loss)	160,194			160,194
Repurchases of common stock, shares	(5,068)	(5,068)
Repurchases of common stock, value	(224,915)	(51)	(187,364)
Common stock repurchase holdback	(187,415)		(37,500)
Value of stock repurchases held by bank under accelerated share repurchase program	37,500
Foreign currency translation adjustment	(24,069)				(24,069)
Change in pension benefits, net of tax	(19,138)				(19,138)
Balance, value at Sep. 30, 2014	$ 853,889	$ 1,150	$ 1,597,277	$ (650,171)	$ (94,367)
Balance, shares at Sep. 30, 2014	115,025	115,025